Water floor device for super high-speed planing boat wind tunnel test and use method thereof

Abstract

This invention relates to a "water floor" device and its usage method for wind tunnel testing of ultra-high-speed planing boats. It includes a water floor assembly installed in the wind tunnel via a second lifting mechanism. Wooden planks are installed at the front and rear of the water floor assembly via the first lifting mechanism. A turntable is installed below the water floor assembly, and a front support rod is installed vertically through the center of the turntable. The top of the front support rod passes upward through the water floor assembly and supports a planing boat model. A rear support rod is installed with the bottom of the planing boat model facing downward. The bottom ends of the front and rear support rods are jointly mounted on a mechanical balance. The water floor assembly has an upward-facing opening for water collection, and the planing boat model is located above the water floor assembly. By replacing the wooden plank below the planing boat model with the water floor assembly, the simulation of ground effect navigation can be effectively achieved while simulating a small portion of the boat's hull navigating in water. This effectively ensures the reliability of wind tunnel test data, greatly simplifies the test equipment and reduces test costs, and is suitable for various test requirements.

Description

Technical Field

[0001] This invention relates to the field of ground effect vehicle technology, and in particular to a "water floor" device for wind tunnel testing of ultra-high-speed planing boats and its usage method. Background Technology

[0002] The high-speed planing boat is a new type of vessel based on ground effect wing unloading technology. It uses the aerodynamic lift generated by the ground effect wing to support most of the hull's weight, but the hull is never completely off the water surface, and a small portion of hydrodynamic lift is always at work. In this way, the ship's speed can be increased many times over, while still maintaining the seakeeping and economy that meet practical requirements.

[0003] Given that a small portion of the hull of a hypersonic planing boat is in the water while the majority of the hull is above the water surface, its navigation characteristics in wind tunnel tests are completely different from those of flight and ship, which do not consider ground effect. It is also different from the navigation characteristics of a ground effect wing boat that uses wooden flooring to simulate ground effect.

[0004] Therefore, in wind tunnel testing, to obtain more intuitive and realistic aerodynamic test results, high-speed planing boat wind tunnel tests often involve cutting away a small portion of the hull model at the wooden floor to simulate the navigation state of this small part of the hull in the water. However, this results in complex and difficult model fabrication (requiring the fabrication of multiple hull sections to meet test requirements), high costs, complex installation, and limitations in simulating actual navigation states due to model constraints. Therefore, there is an urgent need for new testing equipment to meet the unique wind tunnel testing requirements of high-speed planing boats. Summary of the Invention

[0005] In response to the shortcomings of the existing production technology, the applicant provides a reasonably structured "water floor" device for wind tunnel testing of ultra-high-speed planing boats and its usage method. This device effectively simulates the state of a small portion of the hull navigating in water while retaining the simulated ground effect navigation state. It also effectively ensures the reliability of wind tunnel test data, greatly simplifies the test equipment and reduces test costs, and is suitable for different test needs.

[0006] The technical solution adopted in this invention is as follows:

[0007] A "water floor" device for wind tunnel testing of ultra-high-speed planing boats includes a water floor assembly installed on the bottom surface of the wind tunnel via a second lifting mechanism. Wooden flooring is installed on the bottom surface of the wind tunnel in front of and behind the water floor assembly via the first lifting mechanism. A turntable is installed on the bottom surface of the wind tunnel below the water floor assembly. A front support rod is installed vertically through the center of the turntable. The top of the front support rod passes upward through the water floor assembly and supports a planing boat model. A rear support rod is installed downward on the bottom surface of the planing boat model behind the front support rod. The rear support rod passes downward through the water floor assembly and the turntable in sequence. The bottom ends of the front and rear support rods are jointly installed on a mechanical balance. The water floor assembly has an upward-facing opening for holding water, and the planing boat model is located above the opening of the water floor assembly.

[0008] As a further improvement to the above technical solution:

[0009] The top of the front support rod is installed at the center of gravity of the planing boat model, and the top of the rear support rod is installed behind the center of gravity of the planing boat model.

[0010] The structure of the water floor assembly is as follows: it includes an inner shell located in the inner layer and an outer shell that encloses the inner shell inside. Both the inner shell and the outer shell are open at one end and the opening faces upward. There is a gap between the inner shell and the outer shell. An overflow plate is installed between the edge of the opening end of the inner shell and the edge of the opening end of the outer shell. The overflow plate has an overflow hole that runs through the upper and lower parts. The inner shell forms a water-containing cavity for the water floor assembly.

[0011] A water storage tank is installed below the bottom surface of the outer shell, and a drain hole communicating with the water storage tank is opened on the bottom surface of the outer shell.

[0012] A second lifting mechanism is installed in the middle of the bottom surface of the outer shell. Water storage tanks are symmetrically installed on the left and right sides of the bottom surface of the outer shell, and water inlets are opened above the water storage tanks along the edge of the bottom surface of the outer shell.

[0013] A water pump assembly is installed between the water storage tank and the inner shell. The water pump assembly includes a water pipe connecting the water storage tank and the interior of the inner shell, and a pump is installed on the water pipe. The pump pumps water from the water storage tank to the interior of the inner shell.

[0014] The opening edge of the vertical wall of the inner shell extends inward to form a horizontal part, and the inner edge of the horizontal part extends upward to form a vertical part. An overflow plate is installed between the top edge of the vertical part and the opening edge of the outer shell. The height of the top of the vertical part is not lower than the height of the top edge of the outer shell.

[0015] The through-floor assembly has waterproof components for the front and rear support rods to pass through vertically. The horizontal cross-section of the waterproof component for the rear support rod is arc-shaped, with the axis of the front support rod as the center.

[0016] The water-proof assembly includes an inner wall and an outer wall that are spaced apart and fitted together. The bottom end of the inner wall is connected to the inner bottom surface of the outer shell, and the bottom end of the outer wall is connected to the inner bottom surface of the inner shell. The space between the inner wall and the outer wall is connected to the space between the inner shell and the outer shell. The top of the outer wall is not higher than the water level inside the inner shell, and the top of the inner wall is higher than both the water level inside the inner shell and the height of the outer wall.

[0017] A method for using the aforementioned "water floor" device for wind tunnel testing of ultra-high-speed planing boats includes the following steps:

[0018] According to the test requirements, the wooden floor was raised to the preset height by the first lifting mechanism, and the water floor assembly was raised to the preset height by the second lifting mechanism. The attitude of the gliding boat model was adjusted so that the bottom surface of the gliding boat model was in contact with the water surface in the water floor assembly.

[0019] In the experiment, according to the test conditions, the distance between the bottom surface of the gliding boat model and the water floor component and wooden floor is determined by the operation of lifting mechanism one and lifting mechanism two, and the gliding boat model is tested at different ground effect heights; or, the turntable is operated, and the gliding boat model is driven to deflect in the horizontal plane with the front support rod as the center through the rear support rod to conduct the variable drift angle test of the gliding boat model.

[0020] During the test, the water inside the water floor component is dynamically drained to reduce the water volume, or water is replenished into the water floor component according to the test requirements, so that the water floor component maintains the same ground effect simulation characteristics as the wood floor.

[0021] The dynamic drainage process is as follows: When the gliding boat model is immersed in water or the strong wind in the wind tunnel blows the water surface, the water inside the water floor assembly exceeds the top edge of the inner shell, forming an overflow. The overflow flows down through the overflow plate into the gap between the inner shell and the outer shell, and then falls down into the water storage tank through the drain hole on the bottom of the outer shell.

[0022] The water replenishment process is as follows: the water pump assembly operates, pumping water from the storage tank into the inner shell to replenish the water inside the water floor assembly.

[0023] The beneficial effects of this invention are as follows:

[0024] This invention has a compact and reasonable structure and is easy to operate. By replacing the wooden floor under the plank boat model with a water floor component, it can effectively simulate the state of a small part of the hull sailing in water while retaining the simulated ground effect navigation state. It also effectively ensures the reliability of wind tunnel test data, greatly simplifies the test equipment and test costs, and is suitable for different test needs.

[0025] The present invention also includes the following advantages:

[0026] By setting active dynamic drainage and water replenishment for the water floor assembly, the dynamic balance of the water surface in the water floor assembly is ensured, maintaining the same relatively constant horizontal level as the wooden floor. This allows the water floor assembly to maintain the same ground effect model characteristics as the wooden floor during the test, effectively ensuring the authenticity and reliability of the wind tunnel test data. Furthermore, the replenishment and drainage of the water floor assembly will not affect other facilities in the wind tunnel test.

[0027] The active dynamic drainage of the water floor assembly can not only drain water downwards through the overflow plate between the inner shell edge and the outer shell edge, but also drain water through the water-proof components at the front and rear support rods. When the water level is higher than the top of the outer wall of the water-proof component, the water overflows through the gap between the outer and inner walls and drains downwards into the outer shell outside the inner shell, and finally falls through the drain hole on the outer shell to collect in the water storage tank. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the present invention.

[0029] Figure 2 for Figure 1 Top view.

[0030] Figure 3 for Figure 1 The left view.

[0031] Figure 4 This is a schematic diagram of the structure of the water floor assembly of the present invention.

[0032] Figure 5 for Figure 4 Top view.

[0033] Figure 6 for Figure 4 Side view.

[0034] Figure 7 for Figure 4 A magnified view of a portion of point A in the middle.

[0035] Figure 8 for Figure 4 A magnified view of a section at point B.

[0036] Figure 9 for Figure 4 A magnified view of a section at point C.

[0037] Figure 10 for Figure 4 A cross-sectional view along DD.

[0038] Figure 11 for Figure 10 A magnified view of a section at point E in the middle.

[0039] Figure 12 This is a schematic diagram of the variable flight altitude test of the planing boat model of the present invention.

[0040] Figure 13 This is a schematic diagram of the variable angle of attack test of the planing boat model of the present invention.

[0041] Figure 14 This is a schematic diagram of the state of the variable drift angle test of the planing boat model of the present invention.

[0042] The components include: 1. Wind tunnel; 2. Wooden floor; 3. Water floor assembly; 4. Plane boat model; 5. Waterproof assembly; 6. Lifting mechanism one; 7. Lifting mechanism two; 8. Turntable; 9. Mechanical balance.

[0043] 30. Water storage tank; 31. Inner shell; 32. Outer shell; 33. Overflow plate; 34. Water pump assembly;

[0044] 311. Horizontal section; 312. Vertical section; 321. Drain hole;

[0045] 51. Outer wall; 52. Inner wall;

[0046] 91. Front support rod; 92. Rear support rod. Detailed Implementation

[0047] The specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0048] like Figure 1 , Figure 2 and Figure 3 As shown, the "water floor" device for the ultra-high-speed planing boat wind tunnel test in this embodiment includes a water floor assembly 3 installed on the bottom surface of the wind tunnel 1 via a lifting mechanism 2 7. Wooden floor 2 is installed on the bottom surface of the wind tunnel 1 in front of and behind the water floor assembly 3 via lifting mechanisms 1 6. A turntable 8 is installed on the bottom surface of the wind tunnel 1 below the water floor assembly 3. A front support rod 91 is installed through the center of the turntable 8. The top of the front support rod 91 passes upward through the water floor assembly 3 and supports the planing boat model 4. A rear support rod 92 is installed downward on the bottom surface of the planing boat model 4 behind the front support rod 91. The rear support rod 92 passes downward through the water floor assembly 3 and the turntable 8 in sequence. The bottom ends of the front support rod 91 and the rear support rod 92 are jointly installed on a mechanical balance 9. The water floor assembly 3 is provided with an upward-facing opening for holding water, and the planing boat model 4 is located above the opening of the water floor assembly 3.

[0049] By replacing the wooden floor directly beneath the planing boat model 4 with the water floor component 3, and ensuring that the water surface in the water floor component 3 is flush with the front and rear wooden floor 2, the simulated ground effect navigation state is effectively preserved. Under this ground effect navigation premise, the state of a small portion of the hull sailing in the water can be effectively simulated, thereby enabling wind tunnel testing of the ultra-high-speed planing boat.

[0050] The top of the front support rod 91 is installed at the center of gravity of the planing boat model 4, and the top of the rear support rod 92 is installed behind the center of gravity of the planing boat model 4. Thus, the front support rod 91 forms a reliable fulcrum relative to the planing boat model 4. When the height of the rear support rod 92 relative to the front support rod 91 is adjusted or the position is swung, the attitude of the planing boat model 4 can be adjusted.

[0051] like Figure 4 , Figure 5 and Figure 6 As shown, the structure of the water floor assembly 3 is as follows: it includes an inner shell 31 located in the inner layer and an outer shell 32 that encloses the inner shell 31 inside. Both the inner shell 31 and the outer shell 32 are structures with one end open and facing upward. There is a gap between the inner shell 31 and the outer shell 32. An overflow plate 33 is installed between the edge of the opening end of the inner shell 31 and the edge of the opening end of the outer shell 32. An overflow hole that runs through the upper and lower parts is opened on the overflow plate 33. The inner shell 31 forms a cavity for holding water in the water floor assembly 3.

[0052] In this embodiment, both the inner shell 31 and the outer shell 32 can be configured as cuboid or cubic shell structures with the opening facing upwards. They are installed in a nested form with the inner and outer shells spaced apart. Combined with the overflow plate 33, which is a rectangular or square sheet structure installed between the edges of the opening, a relatively closed whole is formed that can be used to drain water overflowing from the inner shell 31. Water overflowing from the inner shell 31 flows into the space between the outer shell 32 and the outer shell through the overflow hole on the overflow plate 33.

[0053] A water storage tank 30 is installed below the bottom surface of the outer shell 32. A drain hole 321 that communicates with the water storage tank 30 is opened on the bottom surface of the outer shell 32. The water storage tank 30 receives water overflowing from the inner shell 31, effectively ensuring the drainage and replenishment of water in the water floor assembly 3, and helping to ensure the balance between the water floor assembly 3 and the wooden floor 2.

[0054] A lifting mechanism 7 is installed in the center of the lower part of the outer bottom surface of the outer casing 32. Water storage tanks 30 are symmetrically installed on the left and right sides of the lower part of the outer bottom surface of the outer casing 32. Drainage holes 321 are opened above the water storage tanks 30 along the edge of the bottom surface of the outer casing 32. Figure 8 , Figure 10 and Figure 11 As shown.

[0055] In this embodiment, the wooden floor 2, the water floor assembly 3, and the wooden floor 2 are arranged sequentially front and back along the axial direction of the wind tunnel 1. The lifting mechanism 6 for supporting and adjusting the height of the wooden floor 2 and the lifting mechanism 7 for supporting and adjusting the height of the water floor assembly 3 are arranged in the same front and back direction. In addition, two sets of lifting mechanisms can be stacked on the left and right sides according to actual needs to effectively ensure the reliability and stability of the lifting operation.

[0056] A water pump assembly 34 is installed between the water storage tank 30 and the inner shell 31. The water pump assembly 34 includes a water pipe that connects the water storage tank 30 and the interior of the inner shell 31. A pump is installed on the water pipe, and the water in the water storage tank 30 is pumped into the interior of the inner shell 31 by the operation of the pump.

[0057] In this embodiment, the water pipe passes through the water storage tank 30, passes through the outer shell 32, and extends into the inner shell 31. The pump can be installed on the water pipe located in the water storage tank 30 or on the water pipe located in the inner shell 31. Of course, multiple independent water pump assemblies 34 can be arranged between the water storage tank 30 and the inner shell 31 according to the actual water replenishment needs.

[0058] like Figure 7 As shown, the opening edge of the vertical wall of the inner shell 31 extends inward to form a horizontal part 311, and the inner edge of the horizontal part 311 extends upward to form a vertical part 312. An overflow plate 33 is installed between the top edge of the vertical part 312 and the opening edge of the outer shell 32. The height of the top of the vertical part 312 is not lower than the height of the top edge of the outer shell 32.

[0059] In this embodiment, the horizontal portion 311 and the vertical portion 312 at the edge of the opening of the inner shell 31 effectively widen the distance between the inner shell 31 and the outer shell 32 at the opening end, thereby effectively ensuring that the water overflowing from the opening of the inner shell 31 can flow smoothly, stably, effectively and reliably down through the overflow plate 33 into the space between the inner shell 31 and the outer shell 32.

[0060] The through-floor assembly 3 has a water-proof component 5 through which the front support rod 91 and the rear support rod 92 pass vertically. The horizontal cross-section of the water-proof component 5 through which the rear support rod 92 passes is an arc-shaped structure. The arc-shaped structure is centered on the axial direction of the front support rod 91. Thus, under the rotation of the turntable 8, the rear support rod 92 rotates synchronously relative to the axial direction of the front support rod 91, that is, the rear support rod 92 swings relative to the corresponding water-proof component 5.

[0061] The water-proof component 5 effectively prevents water from flowing into the front support rod 91, the rear support rod 92, and even the turntable 8 and mechanical balance 9 below, effectively ensuring the normal installation and operation of the front support rod 91 and the rear support rod 92, and effectively ensuring the reliable, smooth and effective use of the test device.

[0062] like Figure 9As shown, the water-proof component 5 includes an inner wall 52 and an outer wall 51, which are spaced together. Both the inner wall 52 and the outer wall 51 are cylindrical sleeve structures. The bottom end of the inner wall 52 is connected to the inner bottom surface of the outer shell 32, and the bottom end of the outer wall 51 is connected to the inner bottom surface of the inner shell 31. The space between the inner wall 52 and the outer wall 51 is connected to the space between the inner shell 31 and the outer shell 32, forming a drainage channel. The top of the outer wall 51 is not higher than the water level inside the inner shell 31. Usually, the top of the outer wall 51 can be set to be the same height as the opening edge of the inner shell 31, so that water overflows under the same water level. The top of the inner wall 52 is higher than the water level inside the inner shell 31 and the height of the outer wall 51, so as to effectively prevent water from crossing the inner wall 52 and contacting the front support rod 91 and the rear support rod 92.

[0063] The active dynamic drainage of the water floor assembly 3 can not only drain water downward through the overflow plate 33 between the edge of the inner shell 31 and the edge of the outer shell 32, but also drain water through the water-proof assembly 5 at the front support rod 91 and the rear support rod 92. When the water level is higher than the top of the outer wall 51 in the water-proof assembly 5, the water overflows through the gap between the outer wall 51 and the inner wall 52 and drains downward into the outer shell 32 outside the inner shell 31, and finally falls and collects in the water storage tank 30 through the drain hole 321 on the outer shell 32.

[0064] By setting active dynamic drainage and water replenishment for the water floor component 3, the dynamic balance of the water surface in the water floor component 3 is ensured, maintaining the same relatively constant horizontal level as the wooden floor 2. This allows the water floor component 3 to maintain the same ground effect model characteristics as the wooden floor 2 during the test, effectively ensuring the authenticity and reliability of the wind tunnel test data. Furthermore, the replenishment and drainage of the water floor component 3 will not affect other facilities in the wind tunnel test.

[0065] In existing traditional wind tunnel tests, the influence of the ground on the aerodynamic performance of the model at different heights is simulated by adjusting the height of the wooden floor. In this embodiment, the wooden floor located directly below the planing boat model 4 is replaced with a water floor assembly 3. By adjusting the height of the water floor assembly 3 and combining it with the height adjustment of the front and rear wooden floors 2, the ground effect state of the planing boat model 4 at different flight heights in the wind tunnel test is realized. By maintaining the height of the water floor assembly 3 relative to the wooden floor 2 and maintaining the water surface height, the same ground effect model characteristics as the wooden floor 2 are maintained. By the contact and immersion of the bottom of the planing boat model 4 with the water surface in the water floor assembly 3, the navigation state of part of the planing boat hull in the water is simulated.

[0066] Similar to traditional wind tunnel testing, the planing boat model 4 is connected to the mechanical balance 9 via the front support rod 91 and the rear support rod 92. Depending on the degree of freedom and flexibility of the test device, the rear support rod 92 and / or the front support rod 91 can be telescopic structures with automatically adjustable length. The tops of the front support rod 91 and the rear support rod 92 can be rotated installation structures with single or double degrees of freedom between them and the planing boat model 4. During the test, the attitude of the planing boat model 4, including parameters such as angle of attack and drift angle, can be adjusted by adjusting the relative position and height between the front support rod 91 and the rear support rod 92 according to the requirements of different tests, thereby enabling different tests including yaw and pitch.

[0067] The method of using the "water floor" device for high-speed planing boat wind tunnel testing in this embodiment includes the following steps:

[0068] According to the test requirements, the wooden floor 2 is raised to the preset height by the lifting mechanism 1 6, and the water floor assembly 3 is raised to the preset height by the lifting mechanism 2 7. The attitude of the gliding boat model 4 is adjusted so that the bottom surface of the gliding boat model 4 contacts the water surface in the water floor assembly 3.

[0069] In the experiment, according to the test conditions, the distance between the bottom surface of the gliding boat model 4 and the water floor component 3 and the wooden floor 2 is determined by the operation of the lifting mechanism 6 and the lifting mechanism 7, and the gliding boat model 4 is tested at different ground effect heights; or, the turntable 8 is operated, and the gliding boat model 4 is driven to deflect in the horizontal plane with the front support rod 91 as the center via the rear support rod 92, and the variable drift angle test of the gliding boat model 4 is carried out.

[0070] During the test, the water in the water floor component 3 is dynamically drained to reduce the water volume, or water is replenished in the water floor component 3 according to the test requirements, so that the water floor component 3 maintains the same ground effect simulation characteristics as the wood floor 2.

[0071] The dynamic drainage process is as follows: When the skid boat model 4 is immersed in water or the strong wind in the wind tunnel 1 blows the water surface, the water inside the water floor assembly 3 exceeds the top edge of the inner shell 31, forming overflow. The overflow flows back down through the overflow plate 33 to the gap between the outer shell 31 and the outer shell 32, and falls down into the water storage tank 30 through the water drop hole 321 on the bottom surface of the outer shell 32.

[0072] Of course, drainage can also be achieved through the water-proof components 5 at the front support rod 91 and the rear support rod 92. When the water level is higher than the top of the outer wall 51 in the water-proof component 5, the water overflows through the gap between the outer wall 51 and the inner wall 52 and flows downward into the outer shell 32 outside the inner shell 31, and finally falls down through the drain hole 321 on the outer shell 32 and collects in the water storage tank 30.

[0073] The water replenishment process is as follows: the water pump assembly 34 operates, pumping water from the water storage tank 30 into the inner shell 31 to replenish water inside the water floor assembly 3.

[0074] like Figure 12 As shown, the variable flight height test was conducted on the planing boat model 4. Specifically, it included: using lifting mechanism 1 6 and lifting mechanism 2 7 to simultaneously raise the wooden floor 2 and the water floor assembly 3 so that a small portion of the planing boat model 4's hull was submerged in water; then, using the center of gravity of the planing boat model 4 as the pivot point, i.e., the connection point between the planing boat model 4 and the front support rod 91, the planing boat model 4 was rotated around the pivot point by extending and retracting the rear support rod 92, reaching the angle of attack value in the cruising state; finally, in this cruising angle of attack state, the wooden floor 2 and the water floor assembly 3 were raised and lowered by operating lifting mechanism 1 6 and lifting mechanism 2 7, thus achieving the test position state of the planing boat model 4 at different ground effect heights, and completing the data measurement of the variable flight height wind tunnel test.

[0075] like Figure 13 As shown, the variable angle of attack test was conducted on the planing boat model 4. Specifically, at a certain ground effect height, the planing boat model 4 can be rotated around its center of gravity by adjusting the extension and retraction of the rear support rod 92, thereby reaching a test position state with a certain preset angle of attack value, and completing the data measurement of the variable angle of attack wind tunnel test.

[0076] In fact, variable flight altitude tests and variable angle of attack tests are often conducted simultaneously. The test data tables and curves obtained are, but are not limited to: test data tables for different flight altitudes and variable angle of attack, curves of aerodynamic coefficients changing with angle of attack at different flight altitudes, and curves of aerodynamic coefficients changing with flight altitude at different angles of attack.

[0077] like Figure 14 The diagram shows a variable drift angle test conducted on planing boat model 4. Specifically, the planing boat model 4 is first adjusted to a certain ground effect height and angle of attack test position. Then, using the axis of the front support rod 91 as the rotation axis, under the driving force of the mechanical balance 9 and the connected rear support rod 92, the rear support rod 92, turntable 8, and planing boat model 4 rotate around the axis of the front support rod 91, achieving the yaw test state of the planing boat model 4, thus completing the data measurement for the variable drift angle wind tunnel test. Typically, the yaw angle β is -12° to 12°. The resulting test data tables and curves include, but are not limited to: variable drift angle test data tables at different flight altitudes, aerodynamic coefficient variation curves at different flight altitudes with drift angle, aerodynamic coefficient variation curves at different drift angles with flight altitude, and aerodynamic coefficient variation curves at different flight altitudes and angles of attack with drift angle.

[0078] Because of the use of the water floor component 3, and the fact that the entire planing boat model 4 is situated within the "water floor" area, during the aforementioned three wind tunnel tests, whether changing the flight altitude, angle of attack, or drift angle, the planing boat model 4 can be freely immersed in the water as required. This allows for a comprehensive simulation of the navigation state of a small portion of the planing boat model 4 in the water, thus avoiding the complex, expensive, and difficult testing methods that would require cutting or piecing together a small portion of the hull model using a wooden floor. Furthermore, the use of the water floor component 3 does not hinder the mechanical balance 9 from adjusting the wind tunnel model for different flight altitudes, angles of attack, and drift angles, including adjusting the angle of attack α within the range of -6° to 12° and the drift angle β within the range of -12° to 12°. Simultaneously, the water floor component 3, developed for specific testing purposes, can be further functionally expanded in the future to develop wind tunnel testing devices with other unique performance characteristics.

[0079] This invention replaces the wooden floor beneath the planking boat model with a water floor component. While retaining the simulated ground effect navigation state, it can effectively simulate the state of a small part of the hull sailing in water, effectively ensuring the reliability of wind tunnel test data, greatly simplifying the test equipment and test costs, and is suitable for different test needs.

[0080] The above description is an explanation of the present invention and not a limitation thereof. The scope of the present invention is defined by the claims. Within the scope of protection of the present invention, any form of modification may be made.

Claims

1. A "water floor" device for wind tunnel testing of ultra-high-speed planing boats, characterized in that: The system includes a water floor assembly (3) installed on the bottom surface of the wind tunnel (1) via a lifting mechanism (7). Wooden flooring (2) is installed on the bottom surface of the wind tunnel (1) in front of and behind the water floor assembly (3) via a lifting mechanism (6). A turntable (8) is installed on the bottom surface of the wind tunnel (1) below the water floor assembly (3). A front support rod (91) is installed through the center of the turntable (8). The top of the front support rod (91) passes upward through the water floor assembly (3) and supports a planing boat model (4). A rear support rod (92) is installed downward on the bottom surface of the planing boat model (4) behind the front support rod (91). The rear support rod (92) passes downward through the water floor assembly (3) and the turntable (8) in sequence. The bottom ends of the front support rod (91) and the rear support rod (92) are installed together on a mechanical balance (9). The water floor assembly (3) is equipped with... The water floor assembly (3) has an upward-facing opening for holding water. The gliding boat model (4) is located above the opening of the water floor assembly (3). The top of the front support rod (91) is installed at the center of gravity of the gliding boat model (4), and the top of the rear support rod (92) is installed behind the center of gravity of the gliding boat model (4). The structure of the water floor assembly (3) is as follows: it includes an inner shell (31) located in the inner layer and an outer shell (32) that encloses the inner shell (31) inside. Both the inner shell (31) and the outer shell (32) are structures with one end open and the opening facing upward. There is a gap between the inner shell (31) and the outer shell (32). An overflow plate (33) is installed between the edge of the opening end of the inner shell (31) and the edge of the opening end of the outer shell (32). An overflow hole that runs through the upper and lower parts of the overflow plate (33) is opened on the overflow plate (33). The water floor assembly (3) has a water-holding cavity inside the inner shell (31).

2. The "water floor" device for wind tunnel testing of ultra-high-speed planing boats as described in claim 1, characterized in that: A water storage tank (30) is installed below the bottom surface of the outer shell (32), and a drain hole (321) communicating with the water storage tank (30) is opened on the bottom surface of the outer shell (32).

3. The "water floor" device for wind tunnel testing of ultra-high-speed planing boats as described in claim 2, characterized in that: The lifting mechanism 2 (7) is installed in the middle of the bottom surface of the outer shell (32). Water storage tanks (30) are symmetrically installed on the left and right sides of the bottom surface of the outer shell (32). The drain hole (321) is opened above the water storage tank (30) along the edge of the bottom surface of the outer shell (32).

4. The "water floor" device for wind tunnel testing of ultra-high-speed planing boats as described in claim 2, characterized in that: A water pump assembly (34) is installed between the water storage tank (30) and the inner shell (31). The water pump assembly (34) includes a water pipe that connects the water storage tank (30) and the interior of the inner shell (31). A pump is installed on the water pipe, and the water in the water storage tank (30) is pumped into the interior of the inner shell (31) by the operation of the pump.

5. The "water floor" device for wind tunnel testing of ultra-high-speed planing boats as described in claim 1, characterized in that: The opening edge of the vertical wall of the inner shell (31) extends inward to form a horizontal part (311), and the inner edge of the horizontal part (311) extends upward to form a vertical part (312). An overflow plate (33) is installed between the top edge of the vertical part (312) and the opening edge of the outer shell (32). The height of the top of the vertical part (312) is not lower than the height of the top edge of the outer shell (32).

6. The "water floor" device for wind tunnel testing of ultra-high-speed planing boats as described in claim 1, characterized in that: The through-floor assembly (3) is provided with a water-proof assembly (5) through which the front support rod (91) and the rear support rod (92) pass vertically. The horizontal cross section of the water-proof assembly (5) through which the rear support rod (92) passes is an arc-shaped structure with the axial direction of the front support rod (91) as the center.

7. The "water floor" device for wind tunnel testing of ultra-high-speed planing boats as described in claim 6, characterized in that: The water-proof component (5) includes an inner wall (52) and an outer wall (51) that are spaced apart. The bottom end of the inner wall (52) is connected to the inner bottom surface of the outer shell (32), and the bottom end of the outer wall (51) is connected to the inner bottom surface of the inner shell (31). The space between the inner wall (52) and the outer wall (51) is connected to the space between the inner shell (31) and the outer shell (32). The top end of the outer wall (51) is not higher than the water level inside the inner shell (31), and the top end of the inner wall (52) is higher than the water level inside the inner shell (31) and the height of the outer wall (51).

8. A method of using the "water floor" device for wind tunnel testing of a high-speed planing boat as described in claim 2, characterized in that: Includes the following steps: According to the test requirements, the wooden floor (2) is raised to the preset height by the lifting mechanism one (6), and the water floor assembly (3) is raised to the preset height by the lifting mechanism two (7). The attitude of the gliding boat model (4) is adjusted so that the bottom surface of the gliding boat model (4) contacts the water surface in the water floor assembly (3). In the experiment, according to the experimental conditions, the distance between the bottom surface of the gliding boat model (4) and the water floor assembly (3) and the wooden floor (2) is determined by the operation of the lifting mechanism one (6) and the lifting mechanism two (7) to test the gliding boat model (4) at different ground effect heights; or, the turntable (8) works, and the gliding boat model (4) is driven to deflect in the horizontal plane with the front support rod (91) as the center through the rear support rod (92) to conduct the variable drift angle test of the gliding boat model (4); During the test, the water in the water floor component (3) is dynamically drained to reduce the water volume, or the water in the water floor component (3) is replenished according to the test requirements, so that the water floor component (3) maintains the same ground effect simulation characteristics as the wood floor (2); The dynamic drainage process is as follows: When the skid boat model (4) is immersed in water or the strong wind in the wind tunnel (1) blows the water surface, the water inside the water floor assembly (3) exceeds the top edge of the inner shell (31), forming an overflow. The overflow flows down through the overflow plate (33) to the gap between the outer shell (31) and the outer shell (32), and falls down into the water storage tank (30) through the drain hole (321) on the bottom surface of the outer shell (32). The water replenishment steps are as follows: the water pump assembly (34) operates to pump the water in the water storage tank (30) into the inner shell (31) to replenish the water inside the water floor assembly (3).

Images