Flapping-fan-deformation coupling variable-camber flapping wing ground experiment device

Abstract

The invention belongs to the technical field of fluid mechanics experiments, and relates to a flapping-fan-deformation coupling variable camber flapping wing ground experiment device which comprises a water tunnel frame and a deformation flapping wing movement mechanism, the deformation flapping wing movement mechanism comprises a linear sliding rail, a first motor, a long shaft, a second motor, a short shaft and a deformation flapping wing, and the deformation flapping wing comprises a front wing section and a rear wing section. The front wing section is rotationally connected with the rear wing section through a rotating shaft, the long shaft drives the front wing section, the short shaft drives the rear wing section, and the front wing section is connected with the rear wing section through the rotating shaft; according to the invention, through a force measuring mechanism in a deformation flapping wing movement mechanism, computer assistance and other regulation and control devices are utilized to collect torsional force and moment of force borne by a deformation wing during movement, and a visual image of a flow field vortex during pitching, sinking and floating and compound movement of the deformation wing in water flow is obtained, so that data processing and analysis are facilitated; therefore, a data foundation is laid for improvement of cruising ability, propelling performance, stability and the like of the flapping wing aircraft.

Description

Technical Field

[0001] The invention belongs to the technical field of fluid mechanics experiments and relates to a flapping-flapping-deformation coupled variable-camber flapping wing ground experiment device. Background Art

[0002] In nature, aquatic and flying creatures have evolved over tens of thousands of years and have excellent movement forms and performances. For example, birds and insects fly by flapping their wings, and fish swim quickly by flapping their fins. The movement mechanisms of these creatures involve complex flows at low Reynolds numbers, including laminar, turbulent and other unsteady flow aerodynamics / hydrodynamics, vortex dynamics and flow control, which are all important research directions in fluid mechanics. Flapping wings include fish fins and bird and insect wings.

[0003] Flapping-wing aircraft still lags far behind natural flying creatures in terms of endurance, propulsion performance, and stability. Dynamic deformation can change the vortex structure around the wing, greatly improving the propulsion performance of the flapping wing and adjusting the flapping wing shape according to different forward conditions. Therefore, the study of deformable flapping wings is particularly critical in low Reynolds number environments.

[0004] However, existing water tunnel experiments mainly focus on the flow field characteristics of non-deformed wings and flexible flapping wings at low Reynolds numbers. The traditional method of measuring and summarizing the deformation of different flexible flapping wings requires a large number of measurements and samples, and consumes a lot of manpower, material resources and time for statistics and comparison, resulting in low work efficiency and high time cost, and cannot effectively combine the propulsion performance of the complex motion of the deformation and flapping wings and the flow field changes.

[0005] Therefore, there is an urgent need for a method or device that can effectively combine the propulsion performance of the complex motion of the deformation and flapping wings and the flow field changes to solve the above technical problems. Summary of the invention

[0006] The present invention uses a mechanical structure to demonstrate the propulsion performance of complex deformation and flapping wing movements, and combines PIV technology and computer assistance to obtain reliable flow field visualization results in a short time. For the flexible deformation and flapping movement of the flapping wing, multi-motor coordinated control is adopted, and the sinking, pitching and deformation pitching movements are realized through PLC control, and pulse regulation is performed between the three movements to realize combined deformation at different phases, fully simulating the movement process of the tail fin of fish, the wings of birds and insects, and improving the simulation degree of the variable curvature flapping wing flapping-fan deformation coupling movement.

[0007] The technical solution adopted by the present invention to solve the technical problem is: a flapping-flapping-deformation coupled variable curvature flapping wing ground experimental device, comprising: a water tunnel frame, a deformable flapping wing motion mechanism, the water tunnel frame is used to simulate fluids under different speeds and conditions, and the deformable flapping wing motion mechanism is used to simulate the flapping motion process of fish tail fins, birds and insect wings;

[0008] The water tunnel frame includes: a sliding platform and a sliding rail. The sliding direction of the sliding rail is set along the flow direction of the liquid flow in the water tunnel frame. The sliding platform is slidably mounted on the sliding rail. The sliding platform can slide back and forth along the sliding direction of the sliding rail. The sliding platform and the sliding rail are used to drive the deformable flapping wing motion mechanism to translate along the flow direction of the fluid to simulate the position translation of the flapping motion in the front and rear directions in the fluid.

[0009] The deformable flapping wing motion mechanism includes: a linear slide rail, a first motor, a long axis, a second motor, a short axis, and a deformable flapping wing, wherein the deformable flapping wing includes: a front wing section and a rear wing section, wherein the front wing section and the rear wing section are rotatably connected via a rotating shaft;

[0010] The linear slide is fixedly connected to the sliding platform, the sliding direction of the linear slide is parallel to the longitudinal section of the liquid flow direction, the fixed part of the first motor is slidably connected to the linear slide through the slider, the first motor can slide back and forth along the sliding direction of the linear slide, the output shaft torque of the first motor is connected to the long axis, and the long axis torque is connected to the front wing section; the linear slide is used to drive the deformed flapping wing to move up and down and left and right in the longitudinal section of the fluid flow direction, so as to simulate the position translation of the flapping motion in the fluid in the up and down and left and right directions;

[0011] The long shaft is also fixedly connected with a fixed support plate, which rotates synchronously with the long shaft, and a fixed part of a second motor is fixedly connected to the fixed support plate, and the output shaft torque of the second motor is connected to the short shaft, and the short shaft torque is connected to the rear wing section; the second motor itself rotates synchronously with the long shaft and drives the rear wing section to swing, so that the rear wing section can swing passively driven by the front wing section and also has self-swinging;

[0012] The axis of the rotating shaft connecting the front wing section and the rear wing section is parallel to the axis of the long axis and the axis of the short axis. The three axes are parallel so that the active swing of the front wing section, the passive swing of the rear wing section and the active swing of the wing itself will not interfere with each other and cause hysteresis or jamming due to the shaft connection and motor drive.

[0013] The deformed flapping wing is fully extended into and immersed in the fluid channel of the liquid flow; the fluid in the fluid channel flows through the main swinging front wing section, the passive swinging and the self-active swinging rear wing section, thereby simulating the flapping motion process of the tail fin of fish, the wings of birds and insects.

[0014] Preferably, the experimental device further comprises a light beam and a camera, wherein the irradiation direction of the light beam is toward the wing surface of the deformed flapping wing, and the shooting direction of the camera is toward the deformed flapping wing; the light beam and the camera are used to monitor the flapping motion of the wing surface of the deformed flapping wing in real time;

[0015] A force measuring device is provided at the torque connection between the output shaft of the first motor and the long shaft, and the force measuring device is used to measure the output torque and output torque change of the first motor; the force measuring device is used to monitor in real time the torque and flapping force of the wing surface of the deformed flapping wing during flapping.

[0016] More preferably, the light beam comprises a laser beam, and the camera comprises a high-speed camera.

[0017] More preferably, the output shaft of the first motor is connected with a shaft flange, the long shaft is connected with a flange, the shaft flange torque is connected with the flange, and the force measuring device is located between the shaft flange and the flange.

[0018] Preferably, the track shape of the slide rail includes: a straight track and a curved track along the length direction; tracks of different shapes can be designed or selected according to experimental needs.

[0019] Preferably, the long-axis torque connection at the front wing section and the short-axis torque connection at the rear wing section are both connected by shaft holes, and the shaft hole connection methods include: connecting three to six prisms with prism holes of matching size and shape, and connecting cylinders with round holes and then fixing them by bolts; the prism prism holes can transmit torque reliably and the connection method is simple, and the swing balance of the deformed flapping wing is better; the cylindrical round holes are connected by bolts, which has lower processing costs but a more complicated connection method and poor balance during swinging. Different connection methods can be selected according to specific needs.

[0020] More preferably, the front wing section and the rear wing section are composed of two symmetrical halves that are split apart on both sides along the flow direction of the liquid flow and are snapped together; the axis-hole connection is located in the symmetry plane of the front wing section and the rear wing section; the snapping method makes the axis-hole connection located in the center plane of the deformed flapping wing, thereby reducing the influence of the connection on the torque, flapping force and movement during flapping.

[0021] More preferably, the shaft hole connection mode at the front wing section of the long-axis torque connection and the shaft hole connection mode at the rear wing section of the short-axis torque connection is a square hole and square groove connection.

[0022] Preferably, the long axis is vertically or obliquely arranged in a plane perpendicular to the flow direction of the liquid flow; the long axis is arranged along different positions, the long axis is inserted from above, and the uninserted surface of the water tunnel frame is sealed with a transparent material. At the same time, the position of the laser beam and the camera needs to be adjusted according to the placement of the flapping wings.

[0023] Preferably, the slide rail is horizontally or obliquely arranged in a vertical plane; when the slide rail is horizontally or obliquely arranged, the deformable flapping wing can respectively achieve horizontal translation or oblique translation in a longitudinal section in the fluid flow direction.

[0024] The beneficial effects of the present invention are:

[0025] 1. The present invention uses a deformable flapping wing motion mechanism to enable the deformable wing segment to simulate the motion process of the tail fin of fish, the wings of birds and insects; and through the force measuring mechanism in the deformable flapping wing motion mechanism, computer-assisted and other control devices are used to efficiently and accurately collect the torsional force and torque exerted on the deformable wing during movement. At the same time, the PIV technology is used to accurately and quickly obtain the visualized image of the flow field vortex of the deformable wing in the water flow during pitching, sinking and floating, and combined motion, so as to facilitate data processing and analysis, thereby laying a data foundation for improving the endurance, propulsion performance and stability of the flapping wing aircraft.

[0026] 2. The present invention can simulate the three-degree-of-freedom motion of the deformable flapping wing (sinking and buoyancy motion, pitching motion and deformation pitching motion) and the flapping state of the flapping wing in different phases between the three motions, and adopts multi-motor collaborative control to realize active flow control in three degrees of freedom; therefore, the present invention effectively combines the propulsion performance of the complex motion of the deformation and flapping wings and the flow field changes, improves the simulation degree of the flapping-fan deformation coupling motion of the variable curvature flapping wing, so as to facilitate the measurement of the deformation amount of flapping wings with different flexibility, improve work efficiency and reduce time cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is an overall structural diagram of a water tunnel test device of a flapping-flapping-deformation coupled variable-camber flapping wing ground experimental device of the present invention;

[0028] Figure 2 is a structural diagram of the deformation flapping wing motion mechanism of the present invention;

[0029] Figure 3 It is a structural diagram of the motion mechanism and the sliding guide rail installation of the present invention;

[0030] Figure 4 is a diagram of the installation structure of the deformable flapping wing of the present invention;

[0031] Figure 5 is an exploded structural diagram of the deformable flapping wing of the present invention;

[0032] Figure 6 is a cross-sectional view of a deformed flapping wing of the present invention;

[0033] Figure 7 It is the measured displacement and designed displacement diagram of the present invention.

[0034] Among them, 1. water tunnel frame; 2. deformable flapping wing motion mechanism; 3. sliding platform; 4. slide rail; 5. liquid flow; 6. laser beam; 7. high-speed camera; 8. first motor; 9. rigid coupling; 10. flange with shaft; 11. force measuring device; 12. flange; 13. long axis; 14. fixed support plate; 15. deformable flapping wing; 16. short axis; 17. second motor; 18. linear slide rail; 19. mounting plate; 20. profile; 21. connecting plate; 22. rear wing section; 23. plug screw; 24. front wing section; 25. nut; 26. front wing section half; 27. rear wing section half. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the relevant technologies in the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] refer to Figures 1 to 7 This embodiment discloses a ground experimental device for a flapping-flapping-deformation coupled variable curvature flapping wing. The experimental device is based on active flow control technology and multi-motor coordinated control technology, and uses a multi-stage deformation device to achieve controllable multi-degree-of-freedom motion of the deformable flapping wing. It can simulate the flapping and deformation process of the tail fin of fish, the wings of birds and insects, and quantify the deformation of the flapping wing. At the same time, the PIV technology is used to visualize the flow field to analyze the vortex distribution of the flow field during the flapping wing process, so as to explore the deformation mechanism of the flapping wing and provide experimental support for bionic design.

[0037] The specific technical solution of this implementation is:

[0038] The variable curvature flapping wing flapping-flap deformation coupled motion ground test experimental device comprises a water tunnel frame 1, a deformable flapping wing motion structure 2, a sliding platform 3, a slide rail 4, a liquid flow 5, a laser beam 6, and a high-speed camera 7;

[0039] The water tunnel frame 1 and the deformable flapping wing motion mechanism 2 are connected to the sliding platform 3 and the slide rail 4 through bolts and the mounting plate 19, and the sliding platform 3 can move linearly along the slide rail 4 in the same direction of the water flow; the water tunnel frame 1 is made of metal material, and its open surface is made of transparent material, such as plexiglass, acrylic and other materials.

[0040] The deformable flapping wing motion mechanism 2 is the main experimental component;

[0041] The deformable flapping wing motion mechanism 2 includes a linear slide 18 (RXSN40 linear module) and a first motor 8 (a stepper motor of model 60BYG250C), the linear slide 18 and the profile 20 (European standard 4040) are installed on the connecting plate 21 through the mounting plate 19 and bolts, and the connecting plate 21 is connected to the sliding platform 3 by bolts;

[0042] The first motor 8 is installed on the slider of the linear guide rail 18 by means of screws and right-angle connectors, ensuring that the motor can move on the linear guide rail 18. The motor shaft is connected to the shaft flange 10 by means of set screws and a rigid coupling 9. The shaft flange 10 and the flange plate 12 are coaxially positioned with the force measuring device 11 (using the sensor 674) and connected by means of set screws.

[0043] The long axis 13 is inserted into the flange 12 and fixed by screws. The fixed part of the first motor 8 rotates the slider connected to the linear slide 18, so that the first motor 8 can rotate in the vertical sliding plane of the linear slide 18, driving the long axis 13 to rotate in the vertical sliding plane of the linear slide 18. Therefore, the initial rotation position of the long axis 13 can be adjusted, for example, horizontal rotation of 0°, oblique rotation of 40°, and vertical rotation of 90° to meet the needs of flapping simulation at different angles.

[0044] The second motor 17 (using a motor with model number 42EM150A) is connected to the fixed support plate 14 by bolts, and the motor shaft is connected to the short shaft 16 by a rigid coupling and a set screw. The position of the fixed support plate 14 is determined by the water level of the water tunnel device in the experiment and the placement position of the deformed flapping wing. Figure 1 The deformed flapping wing 15 is shown to be located in the middle of the water level, which determines that the deformed flapping wing 15 is in the middle of the water tunnel, ensuring that the water flows stably through the wing.

[0045] The deformable flapping wing 15 comprises a rear wing section 22, a screw 23, a front wing section 24 and a nut 25. The deformable flapping wing 15 is a plane-symmetrical structure, the rear wing section 22 is composed of two rear wing section halves 27, the front wing section is composed of two front wing section halves 26, and the wing section halves are connected by set screws.

[0046] In the deformable flapping wing 15 , the rear wing section 22 and the short axis 16 as well as the front wing section 24 and the long axis 13 are connected by bolts in an interlaced manner.

[0047] The laser beam 6 is generated by a laser generator, and the laser irradiation position is perpendicular to the wing symmetry plane.

[0048] The high-speed camera 7 is located 40-50 cm from the bottom surface of the water tunnel frame and in the middle of the wing section movement path.

[0049] The deformable flapping wing 15 adopts a NACA0012 airfoil (chord length 80 mm, span 175 mm), and the material is a light-curing resin.

[0050] After all the mechanisms in the device are installed and connected to the relevant experimental circuits. Adjust the sliding platform to move 3 to the middle of the three-dimensional space of the water tunnel, and place the high-speed camera 7 and the laser generator. Before the formal experiment begins, it is necessary to adjust the x and y directions of the deformable wing section 15 and the force measuring device 11 to ensure that the front wing section 24 passes through the liquid flow 5 first and specifies the positive direction of the force measurement; secondly, twist the long axis 13 to observe whether the change of the computer force measurement interface curve is normal; finally, adjust the position of the laser generator irradiating the laser beam 6 to the middle of the deformable flapping wing section 15, and test whether the linear guide 18 can drive the deformable flapping wing motion mechanism 2 to move, and whether the second motor 17 can drive the short axis 16 and the rear wing section 22 to rotate normally.

[0051] The experimental instruments of this embodiment are introduced as follows: a double-pulse PIV dedicated laser with an output energy of 200mJ, a wavelength of 532nm, and a frequency of 0-15Hz; the laser modulated by a sheet light source can generate a 200*200mm plane beam, which is used to illuminate the PSP in the experimental area to ensure that it is effectively tracked and analyzed; a FlowSense E05M image recorder with a resolution of 2456 2058, a pixel size of 3.5um, a maximum dynamic display range of 14 bits, a maximum full-frame shooting frequency of 16fps, and a minimum cross-frame time of 150ns; a Nikon 50mm / f18 lens with a high-performance narrow-band filter installed in front of it to avoid stray light interference; and DynamicStudio software is used for image analysis.

[0052] Example

[0053] The motion state and specific actions of the device: The linear slide 18 slider drives the pitching and sinking mechanism composed of the first motor 8 to perform reciprocating motion to complete the flapping wing sinking and floating motion. The specific sinking and floating speed is 0.06m / s, and the range of the sinking and floating motion is 0.06m. The first motor 8 rotates to simulate the pitching motion of the wing, and the second motor 17 drives the short shaft 16 to rotate to realize the deformation motion of the wing trailing edge. The three motors are all through the Siemens PLC (Programmable Logic Controller) to realize the sinking, pitching and deformation pitching motion, and adjust between the three motions to achieve deformation in different phases.

[0054] In the formal experiment, all mechanisms meet the experimental requirements, the data of the external control device is correct, the deformation flapping wing motion device is controlled to start moving, the force measuring device collects the force on the long axis during movement and outputs data points, the laser beam is turned on and the PIV camera is used to take pictures using computer software. By continuously adjusting the position of the laser generator, the required experimental results and images are obtained, and finally the flow field images taken are processed and analyzed by computer processing software.

[0055] The flapping motion of the experimental model was measured before the experiment. The Keyence laser displacement sensor (LK-G5000) was used to measure the three points A, B, and C on the flapping wing (such as Figure 6 Here we give the measured displacement and design displacement of point B and point C (as shown in Figure 7 ), ψ is the deformation phase.

[0056] Movement process: The sliding platform 3 can move horizontally along the direction of the water flow, and can statically / dynamically simulate real forward movement; the deformation flapping wing movement mechanism 2 can move on the linear slide rail 18, and it reciprocates perpendicular to the direction of the water flow to simulate the sinking and floating movement; the second motor drives the short shaft 16 to simulate the pitching movement. The above-mentioned single movement process coupling can simulate the actual movement process from multiple angles, that is, the flapping wing deformation pitching sinking and floating process, such as the fish body is still and the tail fin swings to swim forward quickly, and the leading edge of the wings of birds and insects is still, and the trailing edge actively or passively flaps.

[0057] In summary, the present invention uses a deformable flapping wing motion mechanism to enable the deformable wing segment to simulate the motion process of the tail fin of fish, the wings of birds and insects; and through the force measuring mechanism in the deformable flapping wing motion mechanism, computer-assisted and other control devices are used to efficiently and accurately collect the torsional force and torque of the deformable wing during movement, and at the same time, the PIV technology is used to accurately and quickly obtain the visualized image of the flow field vortex of the deformable wing in the water flow during pitching, sinking and floating and compound motion, so as to facilitate data processing and analysis, thereby laying a data foundation for the improvement of the endurance, propulsion performance and stability of the flapping wing aircraft. Therefore, the present invention can accurately simulate the complex motion of the flapping wing, and effectively combine the propulsion performance and flow field changes of the complex motion of the deformation and flapping wing.

[0058] It should be emphasized that the above are only preferred embodiments of the present invention and do not limit the present invention in any form. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A flapping-flapping-deformation coupled variable-camber flapping wing ground experimental device, characterized in that: include: A water tunnel frame (1) and a deformable flapping wing motion mechanism (2), wherein the water tunnel frame (1) is used to simulate fluids at different speeds and conditions, and the deformable flapping wing motion mechanism (2) is used to simulate the flapping motion process of the tail fin of fish, the wings of birds and insects; The water tunnel frame (1) comprises: a sliding platform (3) and a sliding rail (4); the sliding direction of the sliding rail (4) is arranged along the flow direction of the liquid flow (5) in the water tunnel frame (1); the sliding platform (3) is slidably mounted on the sliding rail (4); and the sliding platform (3) can slide back and forth along the sliding direction of the sliding rail (4); The deformable flapping wing motion mechanism (2) comprises: a linear slide rail (18), a first motor (8), a long axis (13), a second motor (17), a short axis (16), and a deformable flapping wing (15); the deformable flapping wing (15) comprises: a front wing section (24) and a rear wing section (22); the front wing section (24) and the rear wing section (22) are rotatably connected via a rotating shaft; The linear slide rail (18) is fixedly connected to the sliding platform (3), the sliding direction of the linear slide rail (18) is parallel to the longitudinal section of the flow direction of the liquid flow (5), the fixed part of the first motor (8) is slidably connected to the linear slide rail (18) through a slider, the first motor (8) can reciprocate along the sliding direction of the linear slide rail (18), the output shaft of the first motor (8) is torque-connected to the long shaft (13), and the long shaft (13) is torque-connected to the front wing section (24); The long shaft (13) is also fixedly connected to a fixed support plate (14), the fixed support plate (14) rotates synchronously with the long shaft (13), the fixed support plate (14) is fixedly connected to a fixed portion of the second motor (17), the output shaft torque of the second motor (17) is connected to the short shaft (16), and the short shaft (16) is connected to the rear wing section (22) by torque; The axis of the rotating shaft connecting the front wing section (24) and the rear wing section (22) is parallel to the axis of the major axis (13) and the axis of the minor axis (16); The deformable flapping wings (15) are completely extended into and immersed in the fluid channel of the liquid flow (5).

2. The flapping-flapping-deformation coupled variable camber flapping wing ground experimental device according to claim 1, characterized in that: The experimental device also includes a light beam and a camera, wherein the irradiation direction of the light beam is toward the wing surface of the deformed flapping wing (15), and the shooting direction of the camera is toward the deformed flapping wing (15); A force measuring device (11) is provided at the torque connection between the output shaft of the first motor (8) and the long shaft (13), and the force measuring device (11) is used to measure the output torque and output torque change of the first motor (8).

3. The flapping-flapping-deformation coupled variable camber flapping wing ground experimental device according to claim 2, characterized in that: The light beam comprises a laser beam (6) and the camera comprises a high-speed camera (7).

4. The flapping-flapping-deformation coupled variable camber flapping wing ground experimental device according to claim 2, characterized in that: The output shaft of the first motor (8) is connected to a shaft flange (10), the long shaft (13) is connected to a flange (12), the shaft flange (10) is torque-connected to the flange (12), and the force measuring device (11) is located between the shaft flange (10) and the flange (12).

5. The flapping-flapping-deformation coupled variable camber flapping wing ground experimental device according to claim 1, characterized in that: The track shape of the slide rail (4) includes a straight track and a curved track along the length direction.

6. The flapping-flapping-deformation coupled variable camber flapping wing ground experiment device according to claim 1, characterized in that: The long axis (13) torque connection at the front wing section (24) and the short axis (16) torque connection at the rear wing section (22) are both shaft-hole connections, and the shaft-hole connection methods include: connecting three to six prisms with prism holes of matching size and shape, and connecting cylinders with round holes and then fixing them with bolts.

7. The flapping-flapping-deformation coupled variable-camber flapping wing ground experimental device according to claim 6, characterized in that: The front wing section (24) and the rear wing section (22) are both composed of two symmetrical halves that are split apart on both sides along the flow direction of the liquid flow (5) and are buckled together; the axial hole connection is located in the symmetrical plane between the front wing section (24) and the rear wing section (22).

8. The flapping-flapping-deformation coupled variable camber flapping wing ground experiment device according to claim 6, characterized in that: The shaft hole connection mode of the torque connection of the long shaft (13) at the front wing section (24) and the torque connection of the short shaft (16) at the rear wing section (22) is a square hole and square groove connection.

9. The flapping-flapping-deformation coupled variable-camber flapping wing ground experimental device according to claim 1, characterized in that: The long axis (13) is arranged vertically or obliquely in a plane perpendicular to the flow direction of the liquid flow (5).

10. The flapping-flapping-deformation coupled variable-camber flapping wing ground experiment device according to claim 1, characterized in that: The slide rail (4) is arranged horizontally or obliquely in a vertical plane.

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