阅读说明：本技术 应用在风洞中的粒子成像测速系统 (Particle imaging speed measurement system applied to wind tunnel ) 是由 胡烨 黑少华 谭健 于 2020-08-28 设计创作，主要内容包括：本申请涉及一种应用在风洞中的粒子成像测速系统,包括风洞洞体、模型支撑及移动装置、粒子发生器、粒子散布连接器、粒子散布管、照明装置以及图像获取装置。模型支撑及移动装置设置于风洞的实验段以外,用于安装模型,并带动模型在风洞的实验段内进行移动。粒子发生器通过粒子散布连接器与粒子散布管连接。风洞的侧壁上对称地开设有安装孔。粒子散布管设置于对称地两个安装孔之间。粒子散布管上设有粒子散布喷嘴,粒子散布喷嘴喷出的示踪粒子层与模型的待测展向截面重合。照明装置发出的激光片光层与模型的待测展向截面以及示踪粒子层三者重合。图像获取装置设置于风洞的实验段以外,用于获取模型的待测展向截面内的图像。(The application relates to a particle imaging speed measurement system applied to a wind tunnel, which comprises a wind tunnel body, a model supporting and moving device, a particle generator, a particle dispersion connector, a particle dispersion pipe, a lighting device and an image acquisition device. The model supporting and moving device is arranged outside the experimental section of the wind tunnel and used for installing the model and driving the model to move in the experimental section of the wind tunnel. The particle generator is connected with the particle dispersion pipe through a particle dispersion connector. The side wall of the wind tunnel is symmetrically provided with mounting holes. The particle dispersion pipe is arranged between the two symmetrical mounting holes. The particle scattering pipe is provided with a particle scattering nozzle, and the tracing particle layer sprayed by the particle scattering nozzle is superposed with the spanwise cross section to be measured of the model. The laser sheet light layer emitted by the lighting device is superposed with the spanwise section to be measured of the model and the tracing particle layer. The image acquisition device is arranged outside the experimental section of the wind tunnel and used for acquiring the image in the to-be-measured spanwise section of the model.)

1. The utility model provides an use particle imaging system of testing speed in wind-tunnel which characterized in that includes:

the side wall of the wind tunnel body is symmetrically provided with mounting holes;

the model supporting and moving device is arranged outside the experimental section of the wind tunnel body and used for installing a model and driving the model to move in the experimental section of the wind tunnel body;

a particle generator for generating trace particles;

a particle dispersion connector having an inlet end connected to the particle generator;

the particle dispersion pipe is connected with the outlet end of the particle dispersion connector and is arranged between the two symmetrical mounting holes, a particle dispersion nozzle is arranged on the particle dispersion pipe, and a tracer particle layer sprayed by the particle dispersion nozzle is superposed with the spanwise section to be measured of the model;

the lighting device is used for emitting a laser sheet light layer which is superposed with the spanwise section to be measured of the model and the tracing particle layer; and

and the image acquisition device is arranged outside the experimental section of the wind tunnel body and is used for acquiring the image in the span-wise section to be measured of the model.

2. The system according to claim 1, wherein the model supporting and moving device comprises:

a base for the bottom end of the model support and movement device;

the flow direction position regulator is arranged on the upper surface of the base and is used for realizing the movement of the model in the flow direction;

the width direction position regulator is arranged on the flow direction position regulator and is used for realizing the movement of the model in the width direction;

a yaw direction adjusting turbine provided on the width direction position adjuster, for realizing adjustment of an angle of the model in the yaw direction;

a pitch direction adjusting turbine, which is arranged on the yaw direction adjusting turbine and is used for realizing the adjustment of the angle of the model in the pitch direction;

the height position adjuster is arranged on the pitching direction adjusting turbine and is used for realizing the adjustment of the model in the height direction, and the flow direction, the width direction and the height direction are mutually vertical in pairs; and

and the model mounting platform is arranged on the height position regulator and used for mounting the model.

3. The particle imaging velocimetry system applied to wind tunnels according to claim 2, wherein the flow direction position regulator comprises:

the flow direction position adjusting track is arranged on the upper surface of the base;

the flow direction position adjusting platform is arranged on the flow direction position adjusting track and used for supporting the width direction position adjuster; and

and the flow direction position adjusting screw is arranged on the upper surface of the base.

4. The particle imaging velocimetry system applied to wind tunnels according to claim 2, further comprising:

the universal wheel is arranged at the bottom of the base; and

the adjusting foot cup is arranged at the bottom of the base.

5. The particle imaging velocimetry system applied to wind tunnels of claim 2, wherein the model mounting platform is provided with threaded through holes for mounting the model.

6. The particle imaging velocimetry system as claimed in claim 1, applied in a wind tunnel, wherein said particle distribution connector comprises:

one end of the locking buckle penetrates through the mounting hole and is connected with one end of the particle dispersion pipe; and

the connecting hose is provided with an inlet end and an outlet end, the inlet end is connected with the particle generator, and the outlet end is connected with the other end of the locking buckle.

7. The particle imaging velocimetry system applied to wind tunnels of claim 6, wherein the connection hose is a Y-shaped quick-insertion hose.

8. The particle imaging velocimetry system applied to wind tunnels according to claim 1, wherein the mounting holes are symmetrically horizontally or symmetrically vertically distributed on the side wall of the wind tunnel body.

9. The particle imaging velocimetry system applied to wind tunnels of claim 8, wherein the number of the mounting holes on each side of the wind tunnel body sidewall is 2 to 7.

10. The particle imaging velocimetry system as claimed in claim 1, wherein said particle distribution tubes are equally spaced with 3 to 7 of said particle distribution nozzles.

Technical Field

The application relates to the technical field of wind tunnel experiments, in particular to a particle imaging speed measurement system applied to a wind tunnel.

Background

In order to simulate the flowing condition of air around an aircraft or an entity, the wind tunnel can provide an airflow environment which is manually generated and controllable, and meanwhile, the effect of the airflow on the entity can be quantized and experimental phenomena can be observed by combining experimental equipment for speed measurement, pressure measurement, force measurement and the like.

Since the advent of wind tunnel experiment technology, the development of modern aviation industry has been advanced, and more high and new measurement technologies are applied to wind tunnel experiment environments. Particle Image Velocimetry (PIV), as a non-contact type full flow field velocity measurement technique, can record velocity information of a certain plane or each moment in a space region within a period of time, and has time resolution capability of a space flow field. The principle is that a large number of tracing particles which have good light reflection performance and can move along with a flow field are uniformly dispersed in the flow field, light sources such as a laser and the like are utilized to illuminate the tracing particles in a measurement area, a digital camera is used to shoot particle photos, and finally the displacement of the tracing particles in two or more frames of photos before and after the particle photos is calculated through a cross-correlation technology. In the case that the time interval between two picture taking is short enough, the velocity of the trace particles can be obtained according to the known displacement and time interval, and the velocity of the flow field in the measuring area can be represented by the velocity. The PIV speed measurement technology not only overcomes the limitations of single-point measurement and equipment interference on the flow field in the past flow field measurement, but also has high precision and high resolution, and is widely applied in various fields of machinery, metallurgy, chemical engineering, automobiles, aviation, hydrology, medicine and the like related to the flow field measurement at present.

On the basis of the flow display technology, the PIV speed measurement makes full use of the optical technology, the modern computer technology and the image processing technology, and the PIV speed measurement is continuously developed along with the progress of the technologies. A typical PIV system is mainly composed of an illumination system, an imaging system, and an image processing system. The illumination system mainly comprises a continuous or pulse laser, an optical path system, a sheet light source optical lens group and the like; the imaging system comprises a digital camera, a signal synchronizer and the like; the image processing system is mainly analysis software and a workstation. Meanwhile, the PIV measurement equipment needs to be adjusted and modified to some extent according to different measurement environments.

Currently, the best field of application of the PIV technology is single-plane flow field measurement in water flow experiments. Because the tracer particles are easily and uniformly dispersed in the aqueous medium, the particles are larger and have good scattering property, and meanwhile, the water flow speed is lower, clear particle images are easily shot, and accurate and high-precision flow field information is obtained. Therefore, the dispersion quality of the tracer particles is closely related to the PIV measurement result, and therefore, how to uniformly disperse the tracer particles in the wind tunnel flow field measurement is a key point.

Disclosure of Invention

Based on this, this application provides a particle imaging system of testing speed who uses in wind-tunnel, can be according to the experiment needs at the different positions installation particle dispersion pipe of wind-tunnel, make the wind-tunnel body become the braced frame of particle dispersion pipe, practice thrift equipment cost, the succinct firm of structure reduces the windward area of particle dispersion pipe, and is little to the flow field interference, still can enlarge the range of scattering of tracer particle.

A particle imaging velocity measurement system applied to a wind tunnel comprises:

the side wall of the wind tunnel body is symmetrically provided with mounting holes;

the model supporting and moving device is arranged outside the experimental section of the wind tunnel body and used for installing the model and driving the model to move in the experimental section of the wind tunnel body;

a particle generator for generating trace particles;

a particle dispersion connector, the inlet end of which is connected with the particle generator;

the particle dispersion pipe is connected with the outlet end of the particle dispersion connector and is arranged between the two symmetrical mounting holes, the particle dispersion pipe is provided with a particle dispersion nozzle, and a tracer particle layer sprayed by the particle dispersion nozzle is superposed with the spanwise section to be measured of the model;

the lighting device is used for emitting a laser sheet light layer which is superposed with the spanwise section to be measured of the model and the tracing particle layer; and

and the image acquisition device is arranged outside the experimental section of the wind tunnel body and is used for acquiring the image in the to-be-measured spanwise section of the model.

In one embodiment, the model supporting and moving device comprises:

a base for supporting the bottom end of the moving device for the model;

the flow direction position regulator is arranged on the upper surface of the base and is used for realizing the movement of the model in the flow direction;

the width direction position regulator is arranged on the flow direction position regulator and is used for realizing the movement of the model in the width direction;

the yaw direction adjusting turbine is arranged on the width direction position adjuster and is used for realizing the adjustment of the angle of the model in the yaw direction;

the pitching direction adjusting turbine is arranged on the yawing direction adjusting turbine and is used for realizing the adjustment of the angle of the model in the pitching direction;

the height position regulator is arranged on the pitching direction regulating turbine and used for realizing the regulation of the model in the height direction, and the flow direction, the width direction and the height direction are mutually vertical in pairs; and

and the model mounting platform is arranged on the height position regulator and used for mounting the model.

In one embodiment, the flow direction position adjuster includes:

the flow direction position adjusting track is arranged on the upper surface of the base;

the flow direction position adjusting platform is arranged on the flow direction position adjusting track and used for supporting the width direction position adjuster; and

and the flow direction position adjusting screw is arranged on the upper surface of the base.

In one embodiment, the method further comprises the following steps:

the universal wheel is arranged at the bottom of the base; and

the adjusting foot cup is arranged at the bottom of the base.

In one embodiment, the model mounting platform is provided with a threaded through hole for mounting the model.

In one embodiment, a particle distribution connector comprises:

one end of the locking buckle passes through the mounting hole and is connected with one end of the particle dispersion tube; and

the connecting hose is provided with an inlet end and an outlet end, the inlet end is connected with the particle generator, and the outlet end is connected with the other end of the locking buckle.

In one embodiment, the connection hose is a Y-shaped quick-insertion hose.

In one embodiment, the mounting holes are symmetrically horizontally or symmetrically vertically distributed on the side wall of the wind tunnel body.

In one embodiment, the number of the mounting holes on each side of the side wall of the wind tunnel body is 2 to 7.

In one embodiment, 3 to 7 particle distribution nozzles are provided in the particle distribution tube at equal intervals.

The particle imaging speed measurement system applied to the wind tunnel comprises a wind tunnel body, a model supporting and moving device, a particle generator, a particle dispersion connector, a particle dispersion pipe, a lighting device and an image acquisition device. The side wall of the wind tunnel is symmetrically provided with mounting holes. The model supporting and moving device is arranged outside the experimental section of the wind tunnel and used for installing the model and driving the model to move in the experimental section of the wind tunnel. The particle generator is connected with the particle dispersion pipe through a particle dispersion connector. The particle dispersion pipe is arranged between the two symmetrical mounting holes. The particle scattering pipe is provided with a particle scattering nozzle, and the tracing particle layer sprayed by the particle scattering nozzle is superposed with the spanwise cross section to be measured of the model. The laser sheet light layer emitted by the lighting device is superposed with the spanwise section to be measured of the model and the tracing particle layer. The image acquisition device is arranged outside the experimental section of the wind tunnel and used for acquiring the image in the to-be-measured spanwise section of the model. Can be according to the experiment needs at the different positions of wind-tunnel installation particle dispersion pipe, make the wind-tunnel body become the braced frame of particle dispersion pipe, practice thrift equipment cost, the succinct firm of structure reduces the windward area of particle dispersion pipe, and is little to the flow field interference, still can enlarge the range of scattering of tracer particle.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a system for measuring a velocity of particle imaging in a wind tunnel according to an embodiment of the present application;

FIG. 2 is a schematic view of a mold support and movement apparatus according to one embodiment of the present application;

FIG. 3 is a schematic view of the connection between the particle generator and the particle dispersing tube according to one embodiment of the present application;

fig. 4 is a schematic installation diagram of a model supporting and moving device, an illuminating device and an image capturing device according to an embodiment of the present application.

Description of the main element reference numerals

10. A wind tunnel body; 11. mounting holes; 20. a model; 30. a model support and movement device; 31. a base; 311. a universal wheel; 312. adjusting the foot cup; 32. a flow direction position regulator; 321. a flow direction position adjustment track; 322. a flow direction position adjusting platform; 323. a flow direction position adjusting screw; 33. a width direction position adjuster; 34. a yaw direction adjustment turbine; 35. a pitch direction adjustment turbine; 36. a height position adjuster; 37. a model mounting platform; 41. a particle dispersion tube; 411. a particle-dispersing nozzle; 42. a particle generator; 43. a particle distribution connector; 431. a locking buckle; 432. a connecting hose; 50. an illumination device; 51. a laser light layer; 52. a laser lens; 53. a tripod; 54. a light guide arm; 55. a laser; 60. an image acquisition device; 61. a camera support; 62. high speed cameras.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and those skilled in the art will be able to make similar modifications without departing from the spirit of the application and it is therefore not intended to be limited to the embodiments disclosed below.

It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, a first acquisition module may be referred to as a second acquisition module, and similarly, a second acquisition module may be referred to as a first acquisition module, without departing from the scope of the present application. The first acquisition module and the second acquisition module are both acquisition modules, but are not the same acquisition module.

It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The application provides a particle imaging velocity measurement system applied to a wind tunnel. The system comprises a wind tunnel body 10, a model supporting and moving device 30, a particle generator 42, a particle dispersion connector 43, a particle dispersion pipe 41, an illuminating device 50 and an image acquiring device 60. The side wall of the wind tunnel body 10 is symmetrically provided with mounting holes 11. The model supporting and moving device 30 is disposed outside the experimental section of the wind tunnel body 10, and is used for installing the model 20 and driving the model 20 to move in the experimental section of the wind tunnel body 10. The inlet end of the particle dispersion connector 43 is connected to the particle generator 42, and the outlet end is connected to the particle dispersion tube 41. The particle dispersion tube 41 is disposed between the two mounting holes 11 symmetrically. The particle distribution pipe 41 is provided with a particle distribution nozzle 411. The layer of tracer particles ejected from the particle distribution nozzle 411 coincides with the spanwise cross section of the model 20 to be measured. The laser sheet light layer 51 emitted by the lighting device 50 is superposed with the spanwise cross section to be measured of the model 20 and the tracer particle layer. The image obtaining device 60 is disposed outside the experimental section of the wind tunnel body 10, and is configured to obtain an image in the span-wise cross section to be measured of the model 20.

Referring to fig. 1 specifically, it is understood that the wind tunnel is not limited to the opening direct current wind tunnel in the embodiment, and the wind tunnel may also be a return wind tunnel. The image capturing device 60 is basically identical to the device using method in the conventional PIV system, and a high-speed camera 62 is mounted on a camera stand 61 as shown in fig. 4 and connected to a computer (not shown in the figure) for saving and processing images.

The wind tunnel 10 is turned on and the particle generator 42 is turned on, and the trace particles generated by the particle generator 42 can enter the particle dispersion pipe 41 from both ends through the particle dispersion connectors 43 and be ejected from the uniformly distributed particle dispersion nozzles 411.

Mounting holes 11 are arranged on the side walls of the wind tunnel body 10 at different positions according to experimental requirements. Optionally, the side wall of the wind tunnel body 10 downstream of the honeycomb network and upstream of the contraction section is provided with symmetrically distributed mounting holes 11. The mounting holes 11 are distributed both vertically and horizontally. As shown in FIG. 3, the particle dispersion tube 41 is mounted between two mounting holes 11, which are symmetrical. The particle dispersion tube 41 has a hollow structure and serves as a flow passage for the tracer particles.

It is understood that the structure of the model supporting and moving device 30 is not particularly limited, as long as the tracer particle scattering position and the position of the model 20 can be changed by adjusting the particle scattering pipe 41 and the model supporting and moving device 30 together, so as to ensure that the tracer particle layer sprayed from the particle scattering nozzle 411 coincides with the spanwise cross section of the model 20 to be measured. At this time, the two high-speed cameras 62 are adjusted to simultaneously and clearly shoot the same area in the spanwise cross section to be measured, and a calibration plate is placed in the area to complete the calibration work of obtaining the ratio of the image pixels to the actual length.

It is to be understood that the number of the particle scattering nozzles 411 is not particularly limited. In one alternative embodiment, there are 3 to 7 particle distribution nozzles 411 provided on the particle distribution tube at equal intervals.

Optionally, the illumination device 50 includes a laser 55, a light guide arm 54, and a laser lens 52 connected in sequence. The laser lens 52 is provided on a tripod 53. The position of the tripod 53 is adjusted, and the laser lens 52 is positioned at the same height as the spanwise cross section to be measured by the light guide arm 54. And opening the laser 55, and finely adjusting the laser lens 52 to enable the laser photosphere 51 to coincide with the spanwise cross section to be measured. In an alternative embodiment, the thickness of the sheet light layer is 1-1.5mm by adjusting the focal length of the lens. At this time, the spanwise cross section to be measured, the trace particle layer and the laser sheet light layer 51 are overlapped, and as shown in fig. 4, the trace particles in the region to be measured are uniformly illuminated, and then the shooting and collection of the experimental image can be started.

In this embodiment, the particle imaging speed measurement system can install the particle dispersion pipe 41 at different positions of the wind tunnel body 10 according to experimental needs, so that the wind tunnel body 10 becomes a support frame for the particle dispersion pipe 41, the equipment cost is saved, the structure is simple and stable, the windward area of the particle dispersion pipe 41 is reduced, the interference to the flow field is small, and the dispersion range of the tracer particles can be enlarged.

In one embodiment, the model supporting and moving device 30 includes a base 31, a flow direction position adjuster 32, a width direction position adjuster 33, a yaw direction adjusting turbine 34, a pitch direction adjusting turbine 35, a height position adjuster 36, and a model mounting platform 37.

The base 31 is the bottom end of the mold supporting and moving device 30. A flow direction position adjuster 32 is provided on the upper surface of the base 31 for effecting movement of the mold 20 in the flow direction. The widthwise position adjuster 33 is provided on the flow direction position adjuster 32 for effecting movement of the mold 20 in the widthwise direction. The yaw direction adjustment turbine 34 is provided to the width direction position adjuster 33, and is used to adjust the angle of the model 20 in the yaw direction. A pitch direction adjustment turbine 35 is provided on the yaw direction adjustment turbine 34 for effecting adjustment of the angle of the model 20 in the pitch direction. A height position adjuster 36 is provided on the pitch direction adjustment turbine 35 for effecting adjustment of the model 20 in the height direction. The flow direction, the width direction and the height direction are mutually vertical in pairs. A model mounting platform 37 is provided on the height position adjuster 36 for mounting the model 20.

According to the example in fig. 1, the tracer particles are horizontal particle layers located in the middle of the wind tunnel body 10, and the model 20 is ensured to be vertical to the tracer particle layers by finely adjusting the positions of the model 20 from bottom to top through adjusting knobs of the model supporting and moving device 30 in five directions, and the spanwise section to be measured is completely overlapped with the tracer particle layers.

Referring also to fig. 2, in an alternative embodiment, the flow direction position adjuster 32 includes a flow direction position adjusting rail 321, a flow direction position adjusting platform 322, and a flow direction position adjusting screw 323. The flow direction position adjustment rail 321 is provided on the upper surface of the base 31. The flow direction position adjustment platform 322 is disposed on the flow direction position adjustment rail 321, and supports the width direction position adjuster 33. The flow direction position adjustment screw 323 is provided on the upper surface of the base 31. By adjusting the flow direction position adjustment screw 323, the flow direction position adjustment platform 322 can slide on the flow direction position adjustment rail 321 to move the other actuators and the model mounting platform 37 back and forth along the flow direction.

The manner in which the mold 20 is mounted on the mold mounting platform 37 is not particularly limited. In an alternative embodiment, the form mounting platform 37 is provided with threaded through holes for mounting the forms 20.

In this embodiment, the particle scattering tube 41 and the model mounting platform 37 are adjusted together, so that the scattering position of the tracer particles and the position of the model 20 can be changed, the testable area of the experiment can be enlarged, the structure of the model supporting and moving device 30 can be simplified, and the influence on the flow field and the equipment cost can be reduced. The model supporting and moving device 30 can realize the adjustment of five degrees of freedom of the model through a mechanical mode, screw rods with different screw pitches can be adopted during the previous design according to experimental needs, the adjustment precision of the model supporting and moving device 30 is designed, and the cost is far lower than that of a five-degree-of-freedom coordinate frame controlled by a stepping motor.

In one of the alternative embodiments, the model supporting and moving device 30 further comprises a universal wheel 311 with locking function and an adjustment cup 312. The universal wheel 311 is disposed at the bottom of the base 31. The adjustment foot cup 312 is disposed at the bottom of the base 31.

Specifically, when the PIV experiment is performed, first, the spanwise cross section to be measured of the model 20 needs to be determined, and the spanwise cross section to be measured is adjusted to the middle area of the experimental section of the wind tunnel body 10. The method comprises the following specific steps: the adjustment knobs on the model support and movement device 30 are adjusted to the neutral or zero position. The universal wheel 311 and the adjusting foot cup 312 below the base 31 are loosened, the model 20 is moved to the middle area of the experimental section of the wind tunnel body 10 through the universal wheel 311, attention is paid to not being too close to the wall surface of the wind tunnel body 10, and the interference of the tunnel wall is avoided. The spanwise cross section to be measured is adjusted to substantially the same cross section of the particle dispersion tube 41 by the height position adjusting means 36. After the approximate position of the mold 20 is determined, the universal wheel 311 is locked and the adjustment cup 312 is lifted up, and the base 31 is fixed and kept horizontal. Then, fine adjustment of the model mounting platform 37 is performed from bottom to top through a threaded screw structure (each position regulator), and finally the section to be measured is completely overlapped with the tracer particle layer, namely a calibration plate is placed in the overlapped area, and calibration work for obtaining the proportion of image pixels to the actual length is completed.

In one embodiment, the structure of the particle distribution connector 43 is not particularly limited as long as the particle generator 42 and the particle distribution tube 41 can be connected and the trace particles can be transported. In one alternative embodiment, the particle distribution connector 43 includes a locking clasp 431 and a connecting hose 432. One end of the locking button 431 is connected to one end of the particle dispersion tube 41 through the mounting hole 11. The connection hose 432 has an inlet end connected to the particle generator 42 and an outlet end connected to the other end of the locking button 431. Optionally, the connection hose 432 is a Y-shaped quick-insertion hose. The Y-shaped quick-insertion hose now has one inlet end and two outlet ends. The two outlet ends are connected to the locking buttons 431 at the two ends of the particle dispersion tube 41. Alternatively, the particle dispersion tube 41 may have internal threads of 5 cm to 10 cm at both ends thereof, and the locking button 431 may be coupled to the external threads, and the step on the locking button 431 may lock the position of the particle dispersion tube 41.

Since the Y-shaped quick-insertion hose, the locking buckle 431, and the particle dispersion tube 41 are all hollow structures, the trace particles generated by the particle generator 42 can enter the particle dispersion tube 41 from both ends through the Y-shaped quick-insertion hose and the particle locking buckle 431, and are sprayed out from the uniformly distributed particle dispersion nozzle 411.

When carrying out the PIV experiment, firstly, the spanwise cross section to be measured of the model 20 needs to be determined, and the cross section is adjusted to the middle area of the experimental section of the wind tunnel body 10. And then, the model 20 is ensured to be vertical to the tracer particle layer by utilizing the joint adjustment of the positions of the particle dispersion pipe 41 and the model mounting platform 37, and meanwhile, the spanwise section to be measured is completely coincided with the tracer particle layer. The two high-speed cameras 62 are adjusted to simultaneously and clearly shoot the same area in the spanwise cross section to be measured, and a calibration plate is placed in the area to finish the calibration work of obtaining the proportion of the image pixels to the actual length. Then, the lighting device 50 is adjusted to make the spanwise cross section to be measured, the tracer particle layer and the laser sheet light layer 51 coincide with each other, and the area to be measured shot in calibration is uniformly illuminated. The conventional shot record is then made for the PIV system. In most PIV experimental processes, when the streaming structures at different spanwise sections are measured, the steps are repeated once, and the PIV experimental process is complicated and has large workload. However, by the application, the structure of the tracer particle scattering device can be simplified, and when different spanwise cross sections are measured, any spanwise cross section to be measured can be moved into the calibrated laser layer 51 only by adjusting the height position adjusting device 36 on the model supporting and moving device 30. Meanwhile, according to experimental needs, the model posture can be adjusted through the flow direction position adjusting device 32, the width direction position adjusting device 33, the yaw direction adjusting turbine 34 and the pitch direction adjusting turbine 35, the influence of the flow direction position, the span direction position, the pitch angle and the yaw angle on the flow structure in the section to be measured is researched, and the method is simple and efficient.

Further, in one embodiment, the cross-sectional area of the experimental section of the wind tunnel body 10 is 0.8m wide × 1.0m high, and in order to make the model supporting and moving device 30 compact, the adjusting ranges of the width direction position adjusting device 33 and the height position adjusting device 36 are not set to be 0-0.8 m and 0-1.0 m, but a method of installing the universal wheel 311 under the base 31 is adopted. When the position of the model 20 is preliminarily determined, the model supporting and moving device 30 is directly pushed to the central area (namely the area with the best flow field quality) of the experimental section of the wind tunnel body 10 and then fixed, and the height from the spanwise section to be measured to the tracer particle layer is finely adjusted by the width direction position adjusting device 33 with the adjusting range of 0-300 mm and the height position adjusting device 36 with the adjusting range of 0-500 mm. 2-7 pairs of symmetrical mounting holes 11 are uniformly distributed on the side wall of the wind tunnel body, and the upper surface of the model mounting platform 37 is just flush with the bottom of the experimental section of the wind tunnel body 10 when the height position adjusting device 36 is at the lowest point. When the particle dispersion pipe 41 is arranged in the middle of the wind tunnel body 10 (the height of the experimental section of the wind tunnel body is 1m), the spanwise section (the height of the model 20 is 600mm) which is 0-500 mm away from the wing root of the model can be measured by adjusting the height position adjusting device 36; when the span-wise section of the measured distance model wing root is greater than 500mm, the particle dispersion pipe 41 can be installed in the installation hole 11 on the upper side of the central position of the wind tunnel body, and the span-wise section to be measured can be reasonably adjusted to the tracer particle layer through the height position adjusting device 36. In this embodiment, the flow field structure of each spanwise cross section of the model 20 from the wing root to the wing tip can be measured only by changing the position of the particle dispersion tube 41 once and completing two PIV calibrations, thereby greatly reducing the workload of adjusting the model, PIV equipment and calibrating in the PIV experimental measurement process. In addition, the adjusting range of the flow direction position adjusting device 32 is 0-600 mm, the adjusting ranges of the yaw direction adjusting turbine 34 and the pitch direction adjusting turbine 35 are-45 degrees, and various measurement requirements in experiments are completely met.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.