阅读说明：本技术 叶片附面层抽吸射流装置 (Suction jet device for blade boundary layer ) 是由 姜伟 谢诞梅 岳亚楠 杜海芬 梅子岳 吴凡 于 2019-09-12 设计创作，主要内容包括：本发明涉及一种叶片附面层抽吸射流装置,包括叶片主体、可转动地设置在叶片主体上气流进出端的转子以及罩盖在转子上且与叶片主体固连的弧形叶片前缘,叶片主体气流进出端的表面上并排设置有多个静叶流道,转子的表面上设置有以其轴线为中心的螺旋形的多个动叶流道,多个静叶流道与多个动叶流道一一对应且连通,叶片前缘在固定于叶片主体上后其与叶片主体其中一表面之间形成用于气流进出的第一缝隙以及与叶片主体上相对的另一表面之间形成气流进出的第二缝隙,第一缝隙和第二缝隙均与多个静叶流道连通。本发明通过一个驱动源驱动转子转动即可获得稳定持续的射流,且射流的大小和方向通过控制转子旋转的转速和方向进行改变,控制方法简单。(The invention relates to a suction jet device for a blade boundary layer, which comprises a blade main body, a rotor and an arc-shaped blade front edge, wherein the rotor is rotatably arranged at an airflow inlet and outlet end of the blade main body, the arc-shaped blade front edge covers the rotor and is fixedly connected with the blade main body, a plurality of static blade flow channels are arranged on the surface of the airflow inlet and outlet end of the blade main body side by side, a plurality of spiral movable blade flow channels taking the axis of the rotor as the center are arranged on the surface of the rotor, the static blade flow channels correspond to the movable blade flow channels one by one and are communicated with the movable blade flow channels one by one, a first gap for airflow to enter and exit is formed between the blade front edge and one surface of the blade main body after the blade front edge is fixed on the blade main body, and a second gap for airflow to enter and exit is formed between the. The invention can obtain stable and continuous jet flow by driving the rotor to rotate by one driving source, and the size and the direction of the jet flow are changed by controlling the rotating speed and the rotating direction of the rotor, so that the control method is simple.)

1. A suction jet device of a vane boundary layer is characterized by comprising a vane main body, a rotor which is rotatably arranged at the air flow inlet end and the air flow outlet end of the vane main body, and an arc-shaped vane front edge which is covered on the rotor and is fixedly connected with the vane main body, a plurality of stationary blade flow channels are arranged on the surface of the airflow inlet and outlet end of the blade main body side by side, a plurality of spiral movable blade flow channels taking the axis as the center are arranged on the surface of the rotor, the plurality of stationary blade flow channels and the plurality of movable blade flow channels are in one-to-one correspondence and communicated, a first gap for air flow to enter and exit and a second gap for air flow to enter and exit are formed between the blade front edge and one surface of the blade main body after the blade front edge is fixed on the blade main body, and the second gap is formed between the blade front edge and the other surface opposite to the blade main body, and the first gap and the second gap are communicated with the plurality of stationary blade flow channels.

2. The suction jet device of the blade boundary layer as claimed in claim 1, wherein a bearing seat is fixed to each of both sides of the air inlet and outlet end of the blade body, both ends of the rotor are respectively connected to the bearing seats through bearings, and both ends of the leading edge of the blade are respectively and correspondingly fixedly connected to the bearing seats on both sides of the blade body through connecting members.

3. The blade boundary layer suction jet device as claimed in claim 1, wherein each of the vane flow passages includes a vane entrance section close to the rotor and a vane output section far from the rotor, the vane entrance section communicating with the vane output section, an angle between the vane entrance section and an axis of the rotor matching an angle between a corresponding blade flow passage and an axis of the rotor.

4. The blade boundary layer suction jet device as claimed in claim 1, wherein an extension of the vane entering section of the vane flow passage in the rotor direction is provided tangentially to a surface of the blade flow passage.

5. The blade boundary layer suction jet device as claimed in claim 1, wherein the vane output section is perpendicular to an axis of the rotor.

6. The blade boundary layer suction jet device as claimed in claim 1, wherein a plurality of stationary blade flow passages are provided side by side on both opposite surfaces of the air flow inlet and outlet end of the blade body, and a plurality of stationary blade flow passages on both opposite surfaces are in one-to-one correspondence with and communicate with the plurality of movable blade flow passages.

Technical Field

The invention relates to the technical field of active flow control, in particular to a suction jet device based on zero-working-medium jet and applied to a blade.

Background

Flow separation is a very important and complex flow phenomenon in fluid mechanics, and is commonly existing in various practical projects such as aerospace, power machinery and the like. In many power machines, separation of the fluid from the solid-walled surface is inevitable. Although splitting the flow can improve heat and mass transfer and mixing efficiency, it tends to result in significant energy losses due to its inherent unsteadiness. The flow separation can not only cause the resistance increase and the lift reduction of the aircraft to cause backflow and even stall, but also reduce the operating efficiency of the power machine, so that the power machine generates vibration and the safe operation of the unit is damaged. For example, in an axial flow compressor, separation of flow around the flow cascade can cause the compressor to enter unstable destructive conditions such as rotating stall and surge, resulting in a sharp drop in pressure ratio and efficiency, increased vibration, and even major accidents. Therefore, the understanding of the physical process of the separation flow is deepened, and the development of the separation flow control technology is always the focus of attention in the academic and engineering fields.

The flow control aims include delaying/accelerating transition, restraining/enhancing turbulence, preventing/promoting separation and the like, so that resistance is reduced, lift force is increased, mixing is enhanced, heat conduction is enhanced, noise caused by flow is restrained, and the method has wide engineering application prospect. Flow control can also be performed to greatly improve the performance of the power machine. For example, flow control on the surface of turbomachinery blades can delay flow separation, increase pressure ratio and mass flow; the surface of the wing is controlled to change the flow state from laminar flow to turbulent flow, so that the flow resistance is reduced; the flow control of the rocket engine can increase the mixing degree, improve the combustion efficiency and the specific impulse, enable the miniaturization of the engine to be possible, and simultaneously can greatly improve the maneuverability and the economy of the rocket and the missile, increase the range and the load and improve the energy utilization rate.

Flow control techniques are divided into passive control and active control in a control manner. Passive control is flow control with no auxiliary energy consumption. This control technique achieves flow control by changing flow boundary conditions, pressure gradients, etc., primarily by adjusting the optimal geometry (e.g., using a solid vortex generator on the surface of the object, machining a series of transverse or longitudinal grooves on the surface of the object upstream of the separation point, placing a roughness element on the surface of the object, etc. to reduce or inhibit flow separation). Such control is determined in advance, and when the actual situation deviates from the design state, the control effect may not reach the optimum design state.

Active control is control that introduces auxiliary energy into the flow. When the control method is adopted, appropriate disturbance needs to be directly injected into the flow environment so as to interact with the flow in the system to achieve the control purpose. The active control method comprises surface motion, continuous or discontinuous suction and blowing, and a method for inputting energy by taking laser, electron beams, plasmas and the like as carriers. The active and passive control methods of flow separation have advantages and disadvantages respectively, and the passive control method has the advantages of simple structure, no need of additionally adding a device or a system, poor variable working condition performance, no corresponding adjustment according to the change of the main flow working condition and increased flow resistance. The active control method has the advantages that the active control method has good variable working condition performance, and the structure or the flow parameters of the active control method can be changed according to the change of the working conditions, so that the optimal control effect is achieved, but the active control method usually needs to add an additional device or system, so that the complexity of the system is increased.

Synthetic jet (also called zero mass jet) is a new technology for active control of flow field by using fluid exciter. Because the working medium comes from the main flow fluid and does not need to be supplied with fluid from the outside, the control structure is simpler and the required energy is extremely low. Ingard et al in 1950 have used sound waves to vibrate the air in a pipe, and thus a series of vortex ring structures are obtained in small holes at both ends of the pipe, but until 1993, Wiltse et al research has made synthetic jet technology really an active flow control technology, and the technology has rapidly become a hotspot of related research. In China, the Ming dynasty et al began to study the formation mechanism of various phenomena of zero-mass jet at the end of the 80's 20 th century and applied it to the active control of flow separation. The jet flow of the traditional zero-working-substance jet flow control technology is generally distributed in a point shape, if a large area of covering of the blade surface is required, a plurality of zero-working-substance jet actuators need to be arranged, so a plurality of driving sources are generally required to be arranged for driving, and the phenomenon that the jet flow is not continuous and the size and the direction of the jet flow are not convenient to control easily occurs.

Disclosure of Invention

The invention aims to provide a suction jet device for a blade boundary layer, which only needs one driving source, and the jet emitted by the device is continuous, the size and the direction of the jet are changed by controlling the rotating speed and the rotating direction of a rotor, and the control is convenient.

The scheme adopted by the invention for solving the technical problems is as follows:

a suction jet device comprises a blade body, a rotor and a cover, wherein the rotor is rotatably arranged at an airflow inlet and outlet end of the blade body, the cover is arranged on the rotor and is fixedly connected with the blade body, a plurality of static blade flow channels are arranged on the surface of an airflow inlet and outlet end of the blade body side by side, a plurality of spiral movable blade flow channels taking the axis of the rotor as the center are arranged on the surface of the rotor, the plurality of static blade flow channels are in one-to-one correspondence and communication with the plurality of movable blade flow channels, the blade front edge is fixed on the blade body and is provided with a first gap for airflow to enter and exit between one surface of the blade body and a second gap for airflow to enter and exit between the other surface of the blade body, and the first gap and the second gap are communicated with the plurality of static blade flow channels.

Furthermore, bearing blocks are respectively fixed on two sides of the airflow inlet and outlet ends of the blade main body, two ends of the rotor are respectively connected with the bearing blocks through bearings, and two ends of the front edge of the blade are respectively and correspondingly fixedly connected with the bearing blocks on two sides of the blade main body through connecting pieces.

Further, every quiet leaf runner is including being close to quiet leaf entering section of rotor and keeping away from quiet leaf output section of rotor, quiet leaf entering section with quiet leaf output section intercommunication, quiet leaf entering section with contained angle between the axis of rotor with the movable blade runner that corresponds with contained angle phase-match between the axis of rotor.

Further, an extension line of the stator blade entrance section of the stator blade flow passage in the rotor direction is provided to be tangent to a surface of the rotor blade flow passage.

Further, the vane output section is perpendicular to the axis of the rotor.

Furthermore, a plurality of static blade flow channels are arranged on two opposite surfaces of the airflow inlet end and the airflow outlet end of the blade main body side by side, and the static blade flow channels on the two opposite surfaces are in one-to-one correspondence and communicated with the movable blade flow channels.

Compared with the prior art, the invention has at least the following beneficial effects: the invention can obtain stable and continuous jet flow by driving the rotor to rotate by one driving source, and the size and the direction of the jet flow are changed by controlling the rotating speed and the rotating direction of the rotor, so that the control method is simple; when the rotor rotates clockwise, the airflow is sucked from the pressure surface and sprayed to the suction surface; when the rotor rotates anticlockwise, airflow is sucked from the suction surface and sprayed to the pressure surface, and control is convenient; when the rotor rotates, the suction jet device plays a role in active flow control, and when the rotor is static, the flow of the main flow cannot be influenced by the existence of the suction jet device; in addition, the stator blade inlet flow angle of the stator blade flow path of the present invention is set to match the rotor blade helix angle of the corresponding rotor blade flow path, so that the flow can smoothly flow between the stator blade flow path and the rotor blade flow path with low loss.

Drawings

FIG. 1 is a schematic structural view of a suction jet device according to an embodiment of the present invention;

FIG. 2 is a partial exploded view of a suction jet device according to an embodiment of the present invention;

FIG. 3 is a schematic structural view of a rotor according to an embodiment of the present invention;

FIG. 4 is a schematic view of the internal flow of working fluid in the suction jet device of the embodiment of the present invention;

fig. 5 is a schematic view showing the spread of the suction jet device according to the embodiment of the present invention in operation.

Detailed Description

The following examples are provided to further illustrate the present invention for better understanding, but the present invention is not limited to the following examples.

The invention provides a suction jet device for a blade boundary layer, which comprises a blade main body 1, a rotor 3 and an arc-shaped blade boundary 2, wherein the rotor 3 is rotatably arranged at the air flow inlet and outlet ends of the blade main body 1, and the arc-shaped blade boundary 2 covers the rotor 3 and is fixedly connected with the blade main body 1, as shown in figures 1 and 2. The upper surface and the lower surface of the blade body 1 are both arc-shaped structures (the description of the orientations such as "up, down, clockwise, counterclockwise" and the like in the embodiment is only for the purpose of illustration and is not meant to limit the invention). Two sides of the airflow inlet and outlet end of the blade body 1 are respectively and fixedly provided with a bearing seat 4, a bearing 5 is arranged in each bearing seat 4, and two ends of the rotor 3 are respectively arranged in the corresponding bearings 5, so that the rotor 3 can freely rotate on the blade body 1. In order to control the size and direction of the jet flow and ensure the continuous output of the jet flow, a plurality of parallel stationary blade flow channels 6 are arranged on the upper surface and the lower surface of the airflow inlet and outlet end of the blade body 1 side by side. Correspondingly, referring to fig. 3, a plurality of spiral-shaped moving blade runners 7 centered on the axis of the rotor 3 are provided on the surface of the rotor 3, and the moving blade runners 7 always maintain an angle with the axis of the rotor 3, which is called a moving blade helix angle. In order to facilitate the inlet and outlet of the airflow, the plurality of stationary blade runners 6 and the plurality of movable blade runners 7 are in one-to-one correspondence and are communicated. Referring to fig. 4, each vane flow path 6 includes a vane entrance section 60 close to the rotor 3 and a vane exit section 61 far from the rotor 3, the vane entrance section 60 communicating with the vane exit section 61. The included angle between the stator blade entering section 60 and the axis of the rotor 3 is a stator blade inlet flow angle, and in order to further improve the fluency of the air flow entering and exiting, the stator blade inlet flow angle of the stator blade flow passage 6 needs to be corresponding to and matched with the rotor blade helix angle of the corresponding rotor blade flow passage 7. Thus, the airflow enters from the stator blade flow path 6 on one surface of the blade body 1, smoothly enters the rotor blade flow path 7 on the rotor 3, and is output from the stator blade flow path 6 on the other surface of the blade body 1. Further, an extension line of the stator blade entering section 60 of the stator blade flow path 6 in the direction of the rotor 3 may be arranged to be tangent to the surface of the rotor blade flow path 7, thereby facilitating the airflow to smoothly enter the stator blade flow path 6 under the centrifugal force of the rotor blade flow path 7. Furthermore, the vane output section 61 is perpendicular to the axis of the rotor 3 in order to ensure that the flow can be injected and ejected in a direction perpendicular to the axis of the rotor 3. The extension line of the stator blade output section 61 extending in the direction away from the rotor 3 is set to be attached to the surface of the blade body 1 where the stator blade output section 61 is located, so that the stator blade output section 61 and the stator blade output section are parallel to each other as much as possible, which is beneficial to ensuring that the air flow ejected or injected from the stator blade output section 61 of the stator blade flow passage 6 is attached to the surface of the blade.

And finally, covering the arc-shaped blade front edge 2 on the rotor 3 to protect the rotor 3, wherein the arc shape of the blade front edge 2 is matched with the shape of the rotor 3, the diameter of the arc shape is slightly larger than that of the rotor 3, and two sides of the covered blade front edge 2 are respectively fixed on bearing seats at two sides of the blade main body 1 through a plurality of bolts. A first gap 8 is formed between the fixed blade leading edge 2 and the upper surface of the blade body 1, and a second gap 9 is formed between the fixed blade leading edge and the lower surface of the blade body 1. In order to reduce the loss of the air flow, the first slots 8 are provided corresponding to the vane output sections 61 of the plurality of vane flow paths 6 on the upper surface of the blade body 1, and the second slots 9 are provided corresponding to the vane output sections 61 of the plurality of vane flow paths 6 on the lower surface of the blade body 1.

In the case of applying the suction jet device of the present embodiment, as shown in fig. 5, the rotor 3 is driven to rotate by the drive source, and during the rotation of the rotor 3, the airflow is sucked from the second slit 9 on the lower surface of the blade body 1, enters from the vane output section 61 of the vane flow path 6 on the lower surface, passes through the vane entry section 60, and smoothly flows onto the blade flow path 7, then enters into the vane flow path 6 on the upper surface, and finally is ejected from the first slit 8 on the upper surface of the blade body 1. Of course, the air flow may be sucked from the first slit 8 on the upper surface of the blade body 1 and then ejected from the second slit 9 on the lower surface of the blade body 1. From the perspective of the figure, when the airflow flows from the second gap 9 to the first gap 8, the clockwise ring amount of the blade profile is increased, and the lift force is increased; when the airflow flows from the first gap 8 to the second gap 9, the counterclockwise loop amount of the blade profile increases, and the lift force decreases.

While the foregoing is directed to the preferred embodiment of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.