Pneumatic lift augmentation system and method for carrying tool

Abstract

The invention provides a pneumatic lift augmentation system and method for a carrying tool, and the system comprises the carrying tool which can move up and down in the X direction; the excitation unit is used for generating unsteady pneumatic excitation, the excitation unit is arranged on the surface of the carrying tool and located on the upper section of the carrying tool, and the excitation unit comprises at least one exciter, and each exciter injects gas in the X direction; each exciter injects gas towards the upper portion of the vehicle, and all the injected gases form the unsteady pneumatic excitation. A low-pressure area is generated by actively controlling a flow field at the upper end of an object, so that the pressure difference between the upper end and the lower end of a carrying tool is increased, and the aerodynamic lift force is increased.

Description

Technical Field

[0001] This invention belongs to the field of aerodynamics technology, and particularly relates to an aerodynamic lift enhancement system and method for a vehicle. Background Technology

[0002] Aerodynamic lift is fundamental for many vehicles to overcome Earth's gravity and achieve aerial movement. For aircraft such as airplanes, aerodynamic lift is crucial for lifting the fuselage off the ground and enabling air transport. For airships and other aerostats, aerodynamic lift ensures safe levitation. For flying cars, aerodynamic lift allows the vehicle to lift off the ground and achieve flight. Increasing aerodynamic lift can effectively improve the payload capacity of various vehicles, enhance their operational safety and economy, and thus bring significant economic benefits. Therefore, increasing aerodynamic lift is a core issue and key challenge for many vehicles.

[0003] As the primary source of aerodynamic lift, the pressure difference between the upper and lower surfaces of the lifting structure in a vehicle is one of the main issues in aerodynamic lift enhancement. The low-pressure region near the upper surface of the lifting structure is a significant source of lift and has been extensively studied and explored. However, apart from traditional shape optimization and flow field morphology control, there is a lack of effective means to enhance the low-pressure region near the upper surface, especially control methods based on unsteady flow field excitation effects. Therefore, active control of the low-pressure region on the upper surface of a vehicle based on unsteady flow field effects can further reduce the pressure field near the upper surface, thereby increasing the aerodynamic lift of the vehicle and ultimately breaking through the bottleneck of aerodynamic lift enhancement, possessing enormous scientific research value and application potential.

[0004] Existing methods for enhancing the aerodynamic lift of vehicles mainly include aerodynamic shape optimization, separated flow control, and boundary layer control. However, these methods are primarily based on changing the flow pattern and structure. As control parameters or aerodynamic shapes are continuously optimized through iteration, the lift enhancement effect gradually approaches its limit, making it difficult to achieve breakthroughs and often resulting in very limited lift enhancement. Summary of the Invention

[0005] The purpose of this invention is to provide a pneumatic lift enhancement system and method for a vehicle. This system generates a low-pressure zone (ranging from 0 to -100 kPa depending on the excitation intensity) by actively controlling the flow field at the upper end of the object, thereby creating low pressure at the desired location. Therefore, this invention can increase the pressure difference between the upper and lower sides of the vehicle by generating a negative pressure zone on its upper side, thus obtaining aerodynamic lift to drive the object's motion. The technical solution adopted is as follows: A vehicle pneumatic lift enhancement system, comprising: Vehicle 1 can move up and down along the X direction; and excitation unit 2, which is used to generate unsteady pneumatic excitation, is disposed on the surface of vehicle 1 and located in the upper section of vehicle 1, and includes: At least one actuator 3, each actuator injects gas along the X direction; Each exciter 3 injects gas upwards toward the vehicle 1, and all the injected gas forms the unsteady pneumatic excitation.

[0006] Preferably, all the exciters 3 are arranged along an arc.

[0007] Preferably, the actuator 3 is fixedly or slidably disposed on the vehicle 1.

[0008] Preferably, the exciter 3 can generate displacement along the Y direction.

[0009] Preferably, it further includes: Mounting plate 6 is installed on vehicle 1; The positioning screw 4 extends along the Y direction and is provided with several positioning nuts 5 that are threadedly connected to it. Both ends of the screw 5 are connected to the base 7. The base 7 is disposed on the mounting plate 6; The positioning nut 5 is detachably equipped with the actuator 3.

[0010] Preferably, the vehicle is any one of an airship, an airplane, a helicopter, a drone, or a flying car.

[0011] Preferably, the exciter is one of a pulse jet exciter, a synthetic jet exciter, an ultrasonic jet exciter, a vibrating diaphragm exciter, or a vibrating part.

[0012] A method for aerodynamic lift enhancement of a vehicle, based on a vehicle aerodynamic lift enhancement system, includes the following steps: Start excitation unit 2; The excitation unit 2 applies unsteady pneumatic excitation to the fluid region at the upper end of the vehicle 1; The fluid at the upper end of the vehicle 1 generates unsteady motions such as eddies, thereby reducing the fluid pressure and increasing the pressure difference between the upper and lower ends of the vehicle 1.

[0013] Compared with the prior art, the advantages of the present invention are: Instead of relying on a specific flow structure, the flow field at the top of the vehicle can be controlled through active flow field control, which can reduce the pressure of the fluid at the top of the object.

[0014] 1) Excellent control effect: Traditional methods of controlling flow field morphology have reached their limits, resulting in limited pressure control effects. This invention, however, can induce unsteady motion in the fluid, thereby generating an unsteady effect dominated by Reynolds stress at the upper end of the vehicle, further reducing the pressure field.

[0015] To further understand the reason for the pressure reduction caused by the Reynolds stress due to unsteady fluid effects, this phenomenon is further explained theoretically based on the Reynolds mean momentum equation, the master governing equation of fluids.

[0016] According to the Reynolds momentum equation, the Reynolds normal stress generated by unsteady fluid motion The corresponding pressure contribution is This means that the Reynolds normal stress directly generates negative pressure at the location.

[0017] As the excitation intensity increases, the Reynolds stress will further increase. Under high intensity (the fluid Reynolds stress generated by the exciter reaches the square of the object's velocity or higher, and the distance D of the exciter can be any range from 0 to half the width of the vehicle), a negative pressure will be generated at the upper end of the vehicle, thereby pulling the vehicle upward.

[0018] "Negative pressure" refers to a pressure value that is much lower than the pressure value in the high-pressure zone of the fluid.

[0019] When the exciter is mounted on the side, Reynolds stress is generated by stimulating the unsteady motion of the fluid to create local low pressure, thereby adjusting the direction and attitude of the motion and achieving excellent control effect.

[0020] 2) Simple installation method: The present invention only requires the exciter to be installed on the surface of the vehicle. The installation method is extremely simple and the structure is compact. It can be widely used in various environments and working conditions without the need for large-scale modifications to the existing structure. 3) Low manufacturing cost: The required actuators are various devices that can generate unsteady disturbances to the fluid. Such actuators are widely available, simple in structure, and easy to obtain, which greatly reduces the control cost. Attached Figure Description

[0021] Figure 1 This is a side view of the pneumatic lift enhancement system for the vehicle in Example 1; Figure 2 This is a schematic diagram of the connection between the excitation unit and the vehicle in Embodiment 2.

[0022] Among them, 1-carrier, 2-excitation unit, 3-exciter, 4-positioning screw, 5-positioning nut, 6-mounting plate, 7-base. Detailed Implementation

[0023] The pneumatic lift enhancement system and method for vehicles of the present invention will now be described in more detail with reference to the schematic diagrams, which illustrate preferred embodiments of the invention. It should be understood that those skilled in the art can modify the invention described herein while still achieving its advantageous effects. Therefore, the following description should be understood as being of general knowledge to those skilled in the art and is not intended to limit the invention.

[0024] Example 1 Definitions: Aerodynamic lift enhancement: Increases aerodynamic lift.

[0025] "Up" direction: The direction of lift of the vehicle 1 and the side where the excitation unit 2 is installed. That is, the direction pointing to the upper part of the vehicle 1.

[0026] In this embodiment, the excitation unit 2 is fixed to the vehicle 1. The lift direction of the vehicle 1 is the X-axis.

[0027] A vehicle aerodynamic lift enhancement system includes: a vehicle 1 and an excitation unit 2.

[0028] Vehicle 1 refers to various vehicles that require aerodynamic lift, such as airships, aircraft, helicopters, drones, and flying cars.

[0029] Excitation unit 2, used to generate unsteady aerodynamic excitation, is disposed on the surface of vehicle 1 and located in the upper section of vehicle 1, and includes: At least one actuator 3, each actuator injects gas in a direction parallel to the lift direction of the vehicle; Each actuator injects gas upwards toward the vehicle, and all the injected gas forms the unsteady pneumatic excitation.

[0030] like Figure 1 As shown, all actuators are arranged along an arc.

[0031] The excitation unit 2 is fixedly installed on the vehicle 1.

[0032] The maximum Y-axis distance D between the rightmost actuator and the vehicle 1 along its X-axis is: the Y-axis width of the vehicle 1 / 2.

[0033] The rightmost actuator (end actuator): along the Y direction, the actuator that is furthest from the X-axis of symmetry of vehicle 1 (along the X-axis of symmetry).

[0034] Y-axis width: The Y-axis distance between the left and right edges of vehicle 1.

[0035] An exciter is a device that can excite fluid to produce unsteady motion, such as a pulse jet exciter, a synthetic jet exciter, an ultrasonic jet exciter, a vibrating diaphragm exciter, or a vibrating part.

[0036] A method for aerodynamic lift enhancement of a vehicle, based on a vehicle aerodynamic lift enhancement system, includes the following steps: The control terminal of the actuator 3 is connected to the control unit of the vehicle 1, and the vehicle 1 sends an start command to the actuator 3.

[0037] The stage of activating exciter 3: during the movement of vehicle 1 or simultaneously with vehicle 1.

[0038] Excitation unit 2 applies unsteady pneumatic excitation to the fluid region at the upper end of vehicle 1; Unsteady fluid motions such as eddies are generated in the fluid region, thereby reducing the air pressure in the fluid region.

[0039] Figure 1 The image shows the state of eddy currents generated by excitation unit 2.

[0040] The black arc-shaped arrows represent eddies; The blue dashed lines represent pressure field contour lines; the darker the color, the lower the pressure. The red part represents excitation unit 2, and the gray part represents vehicle 1.

[0041] In summary, the working principle of this vehicle pneumatic lifting system is as follows: After the excitation unit 2 is installed in a suitable position and started, the excitation unit 2 generates unsteady disturbances in the fluid near the installation position, causing the fluid to generate eddies (such as...). Figure 1 Unsteady flow structures (as indicated by the black arc arrows) generate unsteady fluid effects dominated by Reynolds stress, ultimately creating low-pressure regions at desired locations (pressure field contour lines are shown in the image). Figure 1 As shown by the blue dashed line, the darker the color, the lower the pressure. The Reynolds stress is stronger at the position close to the excitation unit 2, so the pressure is lower. This achieves active control of the pressure field, thereby reducing aerodynamic drag and increasing the pressure difference (aerodynamic lift) between the upper and lower ends of the vehicle 1.

[0042] Furthermore, increasing the excitation intensity or the number of exciters can enhance the Reynolds stress and further strengthen the low-pressure region.

[0043] Example 2 Unlike Embodiment 1, the excitation unit 2 is slidably disposed on the vehicle 1. Specifically, the excitation unit 2 can slide along the Y direction.

[0044] like Figure 2 As shown, the specific structure of the excitation unit 2 includes an exciter 3, a positioning screw 4, a positioning nut 5, a mounting plate 6, and a base 7.

[0045] like Figure 2As shown, the positioning nut 5 is fixedly threaded to the positioning screw 4. The positioning nut 5 is rotated to adjust its position on the positioning screw 4. Then, the exciter 3 is installed on the surface of the positioning nut 5 with screws, thereby realizing the installation and displacement of the exciter 3 in different positions.

[0046] The positioning screw 4 is threadedly connected to the base 7 (mounting joint). The base 7 is fixed to the mounting plate 6. The mounting plate 6 is fixed to the required position of the vehicle 1 by welding or bonding, thereby realizing the installation and fixation of the vehicle 1.

[0047] The above are merely preferred embodiments of the present invention and do not constitute any limitation on the present invention. Any equivalent substitutions or modifications made by those skilled in the art to the technical solutions and content disclosed in the present invention without departing from the scope of the present invention shall be deemed to have remained within the scope of protection of the present invention.

Claims

1. A pneumatic lift enhancement system for a vehicle, characterized in that, include: The vehicle (1) can move up and down along the X direction; and an excitation unit (2), which is used to generate unsteady pneumatic excitation, is disposed on the surface of the vehicle (1) and located in the upper section of the vehicle (1), and includes: At least one actuator (3), each actuator injects gas along the X direction; Each exciter (3) injects gas above the vehicle (1), and all the injected gas forms the unsteady pneumatic excitation.

2. The pneumatic lift enhancement system for a vehicle according to claim 1, characterized in that, All the exciters (3) are arranged along an arc.

3. The pneumatic lift enhancement system for a vehicle according to claim 1, characterized in that, The actuator (3) is fixedly or slidably disposed on the vehicle (1).

4. The pneumatic lift enhancement system for a vehicle according to claim 3, characterized in that, The exciter (3) can generate displacement along the Y direction.

5. The pneumatic lift enhancement system for a vehicle according to claim 4, characterized in that, Further includes: Mounting plate (6), which is mounted on the vehicle (1); The positioning screw (4) extends along the Y direction and is provided with several positioning nuts (5) that are threadedly connected to it. Both ends of the screw are connected to the base (7). The base (7) is disposed on the mounting plate (6); The positioning nut (5) is detachably equipped with the actuator (3).

6. The pneumatic lift enhancement system for a vehicle according to claim 1, characterized in that, The transport vehicle can be any one of the following: airship, airplane, helicopter, drone, or flying car.

7. The pneumatic lift enhancement system for a vehicle according to claim 1, characterized in that, The exciter is one of the following: a pulse jet exciter, a synthetic jet exciter, an ultrasonic jet exciter, a vibrating diaphragm exciter, or a vibrating part.

8. A method for aerodynamic lift enhancement of a vehicle, based on the aerodynamic lift enhancement system of any one of claims 1 to 7, characterized in that, Includes the following steps: Start the excitation unit (2); The excitation unit (2) applies unsteady pneumatic excitation to the fluid region at the upper end of the vehicle (1); The fluid at the upper end of the vehicle (1) generates eddies and other unsteady motions, thereby reducing the fluid pressure and increasing the pressure difference between the upper and lower ends of the vehicle (1).

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