Horizontal bilge plate of amphibious aircraft

Abstract

The invention discloses a horizontal bilge plate of an amphibious aircraft, which is connected to two sides of an aircraft main body and is positioned in a wave suppression groove formed between a wave suppression plate outer plate and the amphibious aircraft main body. The amphibious aircraft is simple in structure, the water skiing resistance peak value of the amphibious aircraft can be remarkably reduced, the water surface take-off acceleration performance of the aircraft is improved, and the amphibious aircraft has great significance in improving the water surface rapidity of the amphibious aircraft.

Description

Technical Field

[0001] The invention belongs to the technical field of hydrodynamic performance of amphibious aircraft, and in particular relates to a horizontal bilge of an amphibious aircraft. Background Art

[0002] The design of an amphibious aircraft is a complex system that requires consideration of the coupling relationship between different performance and aerodynamic layout design. Limited by the aircraft's structural design and weight requirements, the aircraft's hull bottom angle and hull width should not be too large, which can easily lead to the aircraft not being able to obtain sufficient hydrodynamic lift during accelerated gliding on the water, making it difficult for the aircraft's bow to lift off the water surface, which in turn causes problems such as a large peak resistance of the aircraft and difficulty in taking off from the water. Therefore, it is necessary to carry out drag reduction optimization design of amphibious aircraft hulls so that their drag performance meets the design index requirements.

[0003] The traditional optimization design idea is to generate a large number of amphibious aircraft with different shapes by changing the shape control parameters, obtain the performance of the new aircraft through model tests or numerical simulations, and then study the impact of control coupling changes on aircraft performance to provide a basis for optimization. In addition, the optimization process also needs to iteratively consider the impact of shape changes on other performance. The whole process is a repetitive, spiral process, which not only requires a large workload, but also a long optimization cycle. Summary of the invention

[0004] Purpose of the Invention

[0005] In order to improve the problem that an amphibious aircraft has difficulty in raising its nose due to insufficient hydrodynamic lift during takeoff and taxiing on the water surface, resulting in large water-skiing resistance and difficulty in accelerating the aircraft during takeoff on the water surface, the present invention provides a horizontal bilge for an amphibious aircraft.

[0006] Inventing technical solutions

[0007] The utility model relates to a horizontal bilge plate of an amphibious aircraft. The plate is connected to both sides of the aircraft body and is located in a wave suppression groove formed between an outer plate of a wave suppression plate and the amphibious aircraft body.

[0008] Preferably, the plate is arranged horizontally.

[0009] Preferably, the plate is a rectangular strip plate, and the length direction of the plate is along the longitudinal direction of the aircraft body.

[0010] Preferably, the plate is connected to a transition arc of the aircraft body forming the wave suppression groove.

[0011] Preferably, the plate is connected to the aircraft body 3 by gluing or by rivets.

[0012] Preferably, the length of the plate is 0.11L, where L is the length of the aircraft hull.

[0013] Preferably, the plate width is 0.02B, where B is the step width of the aircraft hull.

[0014] Preferably, the plate thickness is 0.005B, where B is the step width of the aircraft hull.

[0015] Preferably, the plate is made of metal material.

[0016] Preferably, the metal material includes aluminum alloy and stainless steel.

[0017] Advantages of the present invention: The present invention does not change the existing linear shape of the amphibious aircraft hull body, but by adding a horizontal bilge plate to the transition arc area of ​​the aircraft wave suppression groove, not only the structure is simple, but also the peak value of the hydroplaning resistance of the amphibious aircraft can be significantly reduced, thereby improving the aircraft's water surface take-off acceleration performance, which is of great significance to improving the water surface speed of the amphibious aircraft. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The present invention is a schematic structural diagram of a horizontal bilge of an amphibious aircraft.

[0019] Figure 2 for Figure 1 Schematic cross-sectional view along direction A.

[0020] Figure 3 for Figure 1 An enlarged schematic diagram of point B.

[0021] Figure 4 for Figure 1 Enlarged schematic diagram of point C.

[0022] Figure 5 The following is a comparison graph of the hydroplaning resistance of an aircraft before and after the installation of a horizontal bilge.

[0023] In the figure: 1- horizontal bilge plate; 2- wave suppression plate; 3- aircraft body; 301- wave suppression tank. DETAILED DESCRIPTION

[0024] The present invention is achieved through the following technical solutions.

[0025] like Figure 1 , Figure 2As shown, a horizontal bilge of an amphibious aircraft, a wave suppression groove 301 is formed between the wave suppression plate 2 and the aircraft body 3, the horizontal bilge plate 1 is connected to both sides of the aircraft body 3 and is located in the wave suppression groove 301, the horizontal bilge plate 1 is in the shape of a rectangular plate, the horizontal bilge plate 1 is horizontally arranged, and the angle with the aircraft reference plane is 0 degrees, and the length direction of the horizontal bilge plate 1 is along the longitudinal direction of the aircraft body 3. In this embodiment, the horizontal bilge plate 1 is arranged at the transition arc of the aircraft body 3 forming the wave suppression groove 301. The horizontal bilge plate 1 can be connected to the aircraft body 3 by gluing or by rivets. The length of the horizontal bilge plate 1 is 0.11L, L is the length of the aircraft hull, the plate width is 0.02B, B is the step width of the aircraft hull, and the plate thickness is 0.005B.

[0026] Example

[0027] The present invention has been verified in the single-hull model test of amphibious aircraft. According to the test results of the model water tank: after installing the horizontal bilge, under typical conditions, the water-skiing resistance peak speed of the amphibious aircraft increases from 0.50V to OT (V OT The theoretical takeoff speed of the aircraft is advanced to 0.39V OT , the drag peak coefficient is reduced from 18.27% to 15.63%, and the drag reduction effect is more than 14%. Figure 5 .

[0028] The protection scope of the present invention is not limited to the above-mentioned embodiments. Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the scope of the present invention. If these changes and modifications fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include these changes and modifications.

Claims

1. A horizontal bilge plate for an amphibious aircraft, characterized in that: The plate is connected to both sides of the aircraft body (3), and the plate is located in a wave suppression groove (301) formed between the wave suppression plate outer plate (2) and the amphibious aircraft body (3).

2. The horizontal bilge of an amphibious aircraft according to claim 1, characterized in that: The board is set horizontally.

3. The horizontal bilge of an amphibious aircraft according to claim 1, characterized in that: The plate is a rectangular strip plate, and the length direction of the plate is along the longitudinal direction of the aircraft body (3).

4. The horizontal bilge of an amphibious aircraft according to claim 1, characterized in that: The plate is connected to the transition arc of the aircraft body (3) forming the wave suppression groove (301).

5. The horizontal bilge of an amphibious aircraft according to claim 1, characterized in that: The plate is connected to the aircraft body (3) by gluing or by rivets.

6. The horizontal bilge of an amphibious aircraft according to claim 3, characterized in that: The length of the plate is 0.11L, where L is the length of the aircraft hull.

7. The horizontal bilge of an amphibious aircraft according to claim 3, characterized in that: The plate width is 0.02B, where B is the step width of the aircraft hull.

8. The horizontal bilge of an amphibious aircraft according to claim 3, characterized in that: The thickness of the plate is 0.005B, where B is the step width of the aircraft hull.

9. The horizontal bilge of an amphibious aircraft according to any one of claims 1 to 8, characterized in that: The plate is made of metal material.

10. The horizontal bilge of an amphibious aircraft according to claim 9, characterized in that: Metal materials include aluminum alloy and stainless steel.

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