阅读说明：本技术 一种新型喷流支杆 (Novel jet flow supporting rod ) 是由 曾德强 纪锋 姚大鹏 叶瑞 于 2021-08-31 设计创作，主要内容包括：本发明公开了一种新型的喷流支杆,包括支杆主体、导气管和柔性节,通过开设于支杆主体的压力气体导气槽、导气管以及柔性节形成了压力气体的导气通路,将压力气体从气源运输到模型,形成喷流,同时,设计了柔性节的具体结构,使之既可以输送压力气体,又可以有效的消除导气管路对于模型测力的干扰,使得测力结果更精确。本发明支杆结构一方面创新性地将支杆结构、导气管路设计为一体,实现了试验设备的小型化、简洁化,另一方面解决了喷流测力试验中导气管路对于模型的测力干扰难题,同时该发明原理简单,结构紧凑,便于加工。(The invention discloses a novel jet flow support rod, which comprises a support rod main body, an air guide pipe and a flexible joint, wherein a pressure gas guide channel of pressure gas is formed by a pressure gas guide groove, the air guide pipe and the flexible joint which are arranged on the support rod main body, the pressure gas is conveyed to a model from a gas source to form jet flow, and meanwhile, the specific structure of the flexible joint is designed, so that the flexible joint not only can convey the pressure gas, but also can effectively eliminate the interference of the air guide pipe on the model force measurement, and the force measurement result is more accurate. The strut structure of the invention creatively designs the strut structure and the gas guide pipeline into a whole on one hand, thereby realizing the miniaturization and simplification of test equipment, and on the other hand, solving the problem of the force measurement interference of the gas guide pipeline on a model in a jet flow force measurement test.)

1. A novel jet flow strut is characterized by comprising a strut main body, an air duct (5) and a flexible joint (6);

the air duct (5) is a rigid air duct and comprises a front section of the air duct (5) and a rear section of the air duct (5);

a pressure gas diversion hole (3) is arranged in the strut main body; the first end of the front section of the air duct (5) is fixedly connected with the main body of the support rod and is communicated with the outlet of the pressure gas diversion hole (3), and the second end of the front section of the air duct is fixedly connected with the first end of the flexible joint (6); the first end of the rear section of the air duct (5) is connected with the second end of the flexible joint (6), and the wind tunnel model is provided with a connector matched with the second end of the rear section of the air duct (5);

external pressure gas enters from an inlet of the pressure gas diversion hole (3), sequentially passes through the pressure gas diversion hole (3), the front section of the gas guide pipe (5), the flexible joint (6) and the rear section of the gas guide pipe (5), and is discharged out of the wind tunnel model through the interface to form jet flow from the second end of the rear section of the gas guide pipe (5).

2. A novel jet strut according to claim 1, characterised in that the flexible joint (6) comprises a first flange (62), resilient support means, a metal bellows (64), and a second flange (65);

the two ends of the metal corrugated pipe (64) are respectively sleeved with a first flange plate (62) and a second flange plate (65), the second end of the front section of the air duct (5) is fixedly connected with the first flange plate (62), and the rear section of the air duct (5) is fixedly connected with the second flange plate (65); the outer walls of the connecting ends of the first flange (62) and the second flange (65) and the metal corrugated pipe (64) are respectively matched with inner wall columns at two ends of the metal corrugated pipe (64), and the first flange (62) and the second flange (65) are used for rigidly supporting the metal corrugated pipe (64);

the elastic support mechanism is arranged on the outer side of the metal corrugated pipe (64), and two ends of the elastic support mechanism are respectively fixedly connected with the first flange plate (62) and the second flange plate (65) to elastically support the metal corrugated pipe (64).

3. The novel jet flow strut as claimed in claim 2, wherein the elastic supporting mechanism is a floating sleeve (63), the floating sleeve (63) is a cylindrical structure, the cylindrical wall is provided with a plurality of sets of U-shaped hollow structures, each U-shaped hollow structure comprises an arc-shaped groove along the circumferential direction and a linear groove along the axial direction, and two ends of each arc-shaped groove are respectively connected with 2 linear grooves.

4. A new jet strut according to claim 3, characterised in that the floating sleeve (63) is provided with 4 sets of hollows A, B, C, D; the hollow structures A and B are positioned at one end of the tubular structure and distributed above and below the tubular structure, and the hollow structures C and D are positioned at the other end of the tubular structure and distributed in front of and behind the tubular structure; the extending direction of the linear grooves in the hollow structures A and B is opposite to the extending direction of the linear grooves in the hollow structures C and D.

5. A novel jet strut as claimed in claim 1, wherein said resilient support means is of the same size as the metal bellows (64) in the axial direction of the metal bellows (64); two ends of the elastic supporting mechanism are respectively and fixedly connected with the first flange plate (62) and the second flange plate (65) through a first compression screw (61) and a second compression screw (66).

6. A new jet flow strut according to claim 1, characterized in that the pressurized gas guiding hole (3) is a through hole provided on the wall of the strut body, the direction of the through hole is parallel to the axial direction of the strut body.

7. A novel jet flow strut as claimed in claim 1, wherein the front section of the air duct (5) is L-shaped, and the direction of the end connected with the flexible joint (6) is parallel to the axial direction of the strut body.

8. The novel jet flow strut according to claim 1, wherein a taper hole (7) matched with a wind tunnel balance cone is formed in the tail of the strut main body, and the wind tunnel balance cone is matched with the taper hole (7) to realize the fixed connection of the wind tunnel balance and the strut main body;

the support rod main body is further provided with a balance wire hole (4), one end of a balance wire is connected with the wind tunnel balance, and the other end of the balance wire is connected with external data acquisition equipment through the balance wire hole (4).

9. A novel jet strut according to claim 1, characterised in that the strut body is further provided with a reference platform (2) for adjusting the roll angle of the test model.

Technical Field

The invention belongs to the field of aerodynamic equipment, and particularly relates to a novel jet flow strut applied to a wind tunnel test.

Background

Modern military fighters, civil airliners, rockets and missiles are equipped with different types of jet engines. The wind tunnel full-mechanical force measurement model test does not generally simulate the jet flow of an engine, and the high-temperature and high-speed jet flow of the engine has obvious influence on the aerodynamic characteristics of an aircraft. Because the jet flow and the outflow field are mutually interfered, the flow state is very complex and is difficult to accurately calculate, so that the influence of the jet flow on the performance of the aircraft is mainly obtained through a wind tunnel test at present. The wind tunnel jet flow test aims at: determining the interference of jet flow on the flow around the outside of the aircraft, thereby fully utilizing the powerful interference of the jet flow and reasonably distributing relevant parts of the aircraft, so as to reduce the resistance of the aircraft and improve the control and stability quality of the aircraft; the method comprises the steps of determining the interference of the outflow to the inflow, fully utilizing the influence of the outflow, reasonably arranging the engine and the position of the spray pipe, and selecting the optimal spray pipe form and size to obtain the maximum engine thrust.

However, unlike a real engine, the engine simulation device in a wind tunnel is mostly driven by pressure gas, and in order to drive the engine simulation device, a dedicated pipeline is required to transport the pressure gas. The power model technology has the problems that the pipeline can convey pressure gas, the balance force measurement is slightly and stably influenced, and the internal force and temperature effects of the pressure gas can be overcome.

Before a wind tunnel test, a support structure of an aircraft needs to be designed, in order to reduce the influence of the support structure on a flow field, a tail support mode is generally adopted, and the tail support is a typical cantilever type structure and needs to extend into a test model cavity. In the wind tunnel jet flow test, on one hand, a tail support mode is required, and on the other hand, pressure gas is required to be introduced, which puts high requirements on the size of a wind tunnel test model.

Disclosure of Invention

The invention aims to overcome the defects and provides a novel jet flow support rod with a jet flow system, which comprises a support rod main body, an air guide pipe and a flexible joint, wherein an air guide passage of pressure gas is formed by a pressure gas guide hole arranged on the support rod main body, the air guide pipe and the flexible joint, the pressure gas is conveyed to a model from a gas source to form jet flow, and meanwhile, the specific structure of the flexible joint is designed, so that the flexible joint not only can convey the pressure gas, but also can effectively eliminate the interference of the air guide pipe on the model force measurement, and the force measurement result is more accurate. The strut structure of the invention creatively designs the strut structure and the gas guide pipeline into a whole on one hand, thereby realizing the miniaturization and simplification of test equipment, and on the other hand, solving the problem of the force measurement interference of the gas guide pipeline on a model in a jet flow force measurement test.

In order to achieve the above purpose, the invention provides the following technical scheme:

a novel jet flow strut comprises a strut main body, an air duct and a flexible joint;

the air duct is a rigid air duct and comprises an air duct front section and an air duct rear section;

a pressure gas diversion hole is formed in the strut main body; the first end of the front section of the gas guide pipe is fixedly connected with the main body of the support rod and is communicated with the outlet of the pressure gas diversion hole, and the second end of the front section of the gas guide pipe is fixedly connected with the first end of the flexible joint; the first end of the rear section of the air duct is connected with the second end of the flexible joint, and the wind tunnel model is provided with an interface matched with the second end of the rear section of the air duct;

external pressure gas enters from the inlet of the pressure gas diversion hole, sequentially passes through the pressure gas diversion hole, the front section of the gas guide pipe, the flexible joint and the rear section of the gas guide pipe, and is discharged out of the wind tunnel model through the interface by the second end of the rear section of the gas guide pipe to form jet flow.

Furthermore, the flexible joint comprises a first flange plate, an elastic supporting mechanism, a metal corrugated pipe and a second flange plate;

the two ends of the metal corrugated pipe are respectively sleeved with a first flange plate and a second flange plate, the second end of the front section of the air duct is fixedly connected with the first flange plate, and the rear section of the air duct is fixedly connected with the second flange plate; the outer walls of the connecting ends of the first flange plate and the second flange plate and the metal corrugated pipe are respectively matched with the inner wall columns at two ends of the metal corrugated pipe, and the first flange plate and the second flange plate are used for rigidly supporting the metal corrugated pipe;

the elastic support mechanism is arranged on the outer side of the metal corrugated pipe, and two ends of the elastic support mechanism are respectively fixedly connected with the first flange plate and the second flange plate to elastically support the metal corrugated pipe.

Further, the elastic support mechanism is a floating sleeve, the floating sleeve is of a cylindrical structure, a plurality of groups of U-shaped hollow structures are arranged on the cylinder wall, each U-shaped hollow structure comprises an arc-shaped groove along the circumferential direction and linear grooves along the axial direction, and two ends of each arc-shaped groove are respectively connected with the 2 linear grooves.

Further, 4 groups of hollow structures A, B, C, D are sleeved on the floating sleeve; the hollow structures A and B are positioned at one end of the tubular structure and distributed above and below the tubular structure, and the hollow structures C and D are positioned at the other end of the tubular structure and distributed in front of and behind the tubular structure; the extending direction of the linear grooves in the hollow structures A and B is opposite to the extending direction of the linear grooves in the hollow structures C and D.

Furthermore, the elastic support mechanism and the metal corrugated pipe have the same size along the axial direction of the metal corrugated pipe; and two ends of the elastic supporting mechanism are respectively and fixedly connected with the first flange plate and the second flange plate through a first compression screw and a second compression screw.

Furthermore, the pressure gas diversion hole is a through hole arranged on the wall of the support rod main body, and the direction of the through hole is parallel to the axial direction of the support rod main body.

Furthermore, the forepart of the air duct is L-shaped, and the direction of one end connected with the flexible joint is parallel to the axial direction of the support rod main body.

Furthermore, a taper hole matched with the cone of the wind tunnel balance is formed in the tail of the support rod main body, and the cone of the wind tunnel balance is matched with the taper hole, so that the wind tunnel balance is fixedly connected with the support rod main body;

the support rod main body is also provided with a balance wire hole, one end of a balance wire is connected with the wind tunnel balance, and the other end of the balance wire is connected with external data acquisition equipment through the balance wire hole.

Furthermore, the support rod main body is also provided with a reference platform for adjusting the roll angle of the test model.

Compared with the prior art, the invention has the following beneficial effects:

(1) the invention provides a jet flow support rod with a jet flow structure for the first time, the support rod structure and the air guide pipeline are designed into a whole, jet flow of an engine can be simulated in a wind tunnel test, the requirement of accurate force measurement of a test model in the wind tunnel can be met, meanwhile, the internal space of the model is reasonably utilized, the interference between the air guide pipeline and the model is avoided, the structure is simple, and the processing is convenient;

(2) in the novel jet flow support rod, the air guide pipeline and the support structure are designed into a whole, specifically, the metal corrugated pipe is used as an air guide channel in the flexible joint, the elastic support mechanism is arranged outside the metal corrugated pipe, and in addition, the connection between the flexible joint and the rigid air guide pipe and the rigid support of the metal corrugated pipe in the flexible joint are realized through flanges at two ends, so that the miniaturization and simplification of wind tunnel test equipment are realized;

(3) the novel jet flow support rod is provided with the pressure gas guide hole capable of stably conveying pressure gas, so that the problem of designing a gas guide pipeline for conveying the pressure gas from a gas source to the interior of a test model is solved; in a preferred scheme, the pressure gas diversion hole can not only reasonably utilize the internal space of the support rod to make the test equipment smaller, but also prevent the external air guide pipe from being directly exposed in the wind tunnel, thereby reducing the risk of breakage of the air guide pipe;

(4) the invention particularly designs the structure of the elastic supporting mechanism in the flexible joint, so that the flexible joint can generate elastic deformation while having certain rigidity, thereby relieving the acting force of the pressure gas on the air guide pipeline and effectively eliminating the interference of the air guide pipeline on the model jet flow force measurement.

Drawings

FIG. 1 is a schematic structural view of a novel jet strut of the present invention;

FIG. 2 is a schematic structural view of a strut body according to the present invention; wherein FIG. 2(a) is a front view, and FIG. 2(b) is a sectional view in the A-A direction of FIG. 2 (a);

FIG. 3 is a schematic structural view of a flexible joint of the present invention; wherein FIG. 3(a) is a front view, and FIG. 3(b) is a sectional view in the A-A direction of FIG. 3 (a);

FIG. 4 is a schematic view of the structure of the flange plate in the flexible joint according to the present invention; wherein FIG. 4(a) is a front view, and FIG. 4(b) is a sectional view in the A-A direction of FIG. 4 (a);

FIG. 5 is a schematic structural view of a floating sleeve in a flexible joint according to the present invention; FIG. 5(a) is a front view, FIG. 5(b) is a left side view, FIG. 5(c) is a perspective view, and FIG. 5(d) is a sectional view in the A-A direction of FIG. 5 (a);

FIG. 6 is a schematic structural diagram of a metal bellows in a flexible joint according to the present invention; wherein FIG. 6(a) is a front view, and FIG. 6(b) is a sectional view in the A-A direction of FIG. 6 (a);

fig. 7 is a schematic structural view of a compression screw in a flexible joint according to the present invention, wherein fig. 7(a) is a front view and fig. 7(b) is a left side view.

Detailed Description

The features and advantages of the present invention will become more apparent and appreciated from the following detailed description of the invention.

The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

The invention aims to provide a novel support rod structure for a wind tunnel force measurement test, which is required to solve the problem of interference of an air guide pipeline on force measurement in a jet flow force measurement test, reasonably utilizes the internal space of a model, avoids the interference of the air guide pipeline and the model, and has small occupied space, simple structure and convenient processing.

In order to achieve the above purpose, the present invention provides a novel strut structure capable of introducing gas and eliminating jet flow interference, as shown in fig. 1, the novel jet flow strut of the present invention is arranged inside a test model, and comprises a strut main body structure, an air duct 5 and a flexible joint 6, wherein the air duct 5 comprises a front section of the air duct 5 and a rear section of the air duct 5;

as shown in fig. 2(a) and (b), the surface of the main body of the strut is designed with a key groove 1, which is convenient for the connection and fixation of the strut in the wind tunnel mechanism, and the main body of the strut is designed with a reference platform 2, which is convenient for the roll adjustment of the test model. Two hole grooves, namely a pressure gas diversion hole 3 and a balance wire hole 4, are designed on the support rod main body. The pressure gas diversion hole 3 is positioned in the support rod main body, so that the internal space of the support rod can be reasonably utilized, the test equipment is smaller, and on the other hand, an external air guide pipe is prevented from being directly exposed in a wind tunnel, so that the risk of air guide pipe breakage is reduced. The 3 exit in pressure gas water conservancy diversion hole has welded 5 anterior segments of "L" shape metal air duct, and the 5 anterior segments other ends of metal air duct and the 6 one end of flexible festival are connected, and 5 back ends of air duct are connected with the 6 other ends of flexible festival, and air duct 5 can provide effectual rigidity for the flexible festival and support, avoids pipeline and model inner chamber to collide mutually. The flexible joint 6 is composed of a flange plate, a metal corrugated pipe, a floating sleeve and the like, can effectively eliminate the force measurement interference of the gas guide pipeline on the model, and can convey pressure gas. A taper hole 7 is arranged at the tail part of the strut main body, and a wedge hole is arranged on the taper hole, so that the wind tunnel balance is fixed. In a wind tunnel test, pressure gas sequentially passes through the strut main body, the pressure gas diversion hole 3, the front section of the gas guide pipe 5, the flexible joint, the rear section of the gas guide pipe 5 and the model, so that the purpose of conveying the pressure gas from a gas source to the model is achieved.

The branch main part is connected with 5 anterior segments of air duct, and the inside design of branch main part has balance wire hole 4 and pressure gas water conservancy diversion hole 3, and the through-hole on the branch main part wall is located to pressure gas water conservancy diversion hole 3, realizes balance wire and the leading-in purpose of pressure gas from the branch main part is inside respectively. The tail end of the strut main body is connected with the wind tunnel balance and fixed through the cone and the wedge, so that the wind tunnel balance is supported. The air duct 5 is made of metal.

The two ends of the front section of the metal air duct 5 are respectively welded with the support rod main body and the flexible joint 6, so that the air duct system is fixed, and the condition that the air duct touches the test model is avoided. The pressure gas guide passage is formed by the pressure gas guide hole, the gas guide pipe and the flexible joint which are arranged on the support rod main body.

The flexible joint 6 can remove the acting force of the pressure gas on the air guide pipeline on one hand and provide rigid support for the later section of the air guide pipe 5 connected with the model on the other hand. As shown in fig. 3(a) and (b), the flexible joint 6 mainly includes: a first flange 62, a floating sleeve 63, a metal bellows 64, a second flange 65, a first compression screw 61 and a second compression screw 66.

One end of the first flange plate 62 is welded with the front section of the metal air duct 5, the other end of the first flange plate is connected with one end of the floating sleeve 63 through the first compression screw 61, one end of the second flange plate 65 is welded with the rear section of the metal air duct 5, and the other end of the second flange plate is connected with the other end of the floating sleeve 63 through the second compression screw 66. The compression screw is shown in fig. 7(a) and (b). The flange, as shown in fig. 4(a) and (b), may serve as a seal on the one hand and a rigid support on the other hand. Meanwhile, the right end of the first flange plate 62 is connected with the left ends of the metal corrugated pipe 64 and the second flange plate 65 in a column matching manner, so that the metal corrugated pipe 64 can be fixed, and the air tightness of the flexible joint 6 can be ensured.

As shown in fig. 5(a), (b), (c), and (d), threaded holes are designed at both ends of the floating sleeve 63, and can be connected with the flange plate through compression screws. The left side of the floating sleeve 63 is in a vertically-distributed opposite U-shaped hollow design, and the right side of the floating sleeve 63 is in a longitudinally-distributed opposite U-shaped hollow design. Through the hollowed-out design, on one hand, the rigidity of the flexible joint 6 is guaranteed, so that rigid support is provided for a subsequent air guide pipeline connected with a test model, namely the rear 2 sections of the air guide pipe 5, the situation that the air guide pipeline touches the test model after deformation under the action of pressure gas is avoided, on the other hand, due to the hollowed-out design, the flexible joint 6 can elastically deform, the acting force of the pressure gas on the air guide pipeline is removed, and the problem of force measurement interference of jet flow on the model is solved. The floating sleeve 63 and the metal bellows 64 have the same length, and the inner cavity of the floating sleeve 63 serves to accommodate the metal bellows 64.

As shown in fig. 6(a) and (b), the metal bellows 64 is installed inside the floating sleeve 63, and both ends of the metal bellows are connected and fixed to the flange plate by column fitting. The metal corrugated pipe 64 mainly plays a role in air guiding, and meanwhile, due to the ductility of the corrugated pipe, the acting force of the pressure gas on the pipe can be removed, so that the interference of jet flow on the test force measurement is effectively avoided.

The invention has been described in detail with reference to specific embodiments and illustrative examples, but the description is not intended to be construed in a limiting sense. Those skilled in the art will appreciate that various equivalent substitutions, modifications or improvements may be made to the technical solution of the present invention and its embodiments without departing from the spirit and scope of the present invention, which fall within the scope of the present invention. The scope of the invention is defined by the appended claims.

Those skilled in the art will appreciate that those matters not described in detail in the present specification are well known in the art.