Water surface aircraft cavitation observation test model

Abstract

The invention discloses a water surface aircraft cavitation observation test model which comprises a ship bottom and a hollow ship body, the ship bottom and the ship body are connected to form a cabin, and a gravity center adjusting structure and a hoisting mechanism are connected to the ship body. The model weight distribution is reasonable, and the center-of-gravity position is convenient to adjust by adopting the center-of-gravity

Description

Technical Field

[0001] The present invention belongs to the technical field of surface vehicle model tests, and particularly relates to a cavitation observation test model for a surface vehicle. Background Art

[0002] In order to meet the short takeoff and landing requirements of surface vehicles under complex sea conditions, it is necessary to carry out the analysis of the cavitation water-vapor separation characteristics and the research on drag reduction technology after the stepped bottom of the ship type, form a drag reduction method based on the optimization of the ship type cavitation water-vapor separation, and significantly reduce the peak drag.

[0003] In response to the above research requirements, it is necessary to conduct a cavitation observation model test in a water tank. During the cavitation observation model test, the trailer drives the model to move. By changing the air injection volume at the bottom of the model, the cavitation area and drag change at the bottom of the ship are observed, and a drag reduction performance verification method based on the control of the ship type cavitation water-vapor separation is formed, providing technical support for the short takeoff and landing of surface vehicles.

[0004] Generally, under strict weight requirements, the strength of the general model is low, and the mass center inertia cannot meet the usage requirements. There are no air holes at the bottom of the ship, and at the same time, the requirement for observing the cavitation area at the bottom of the ship cannot be met. It is necessary to design a reasonable cavitation observation test model to meet the test requirements. Summary of the Invention

[0005] Object of the Invention

[0006] Aiming at the problem that the existing cavitation observation model does not meet the test requirements, the present invention provides a cavitation observation test model for a surface vehicle.

[0007] Technical Solution of the Invention

[0008] A cavitation observation test model for a surface vehicle includes a bottom of the ship, a hollow ship body, the bottom of the ship is connected to the ship body to form a cabin, and a center of gravity adjustment structure and a hoisting mechanism are connected to the ship body.

[0009] Preferably, the bottom of the ship is V-shaped and is formed by connecting the bottom of the ship before the step and the bottom of the ship after the step.

[0010] Preferably, both the bottom of the ship before the step and the bottom of the ship after the step are made of transparent acrylic material.

[0011] Preferably, square grids are drawn on both the bottom of the ship before the step and the bottom of the ship after the step.

[0012] Preferably, a number of metal interfaces are inlaid on the bottom of the ship after the step, and compressed air can be blown into the model from the metal interfaces.

[0013] Preferably, the hull includes an outer shell, a metal side wall, a bottom opening frame, a center-of-gravity adjustment beam, an intermediate connector, and a structural connector. Among them, the outer shell is fixed outside the metal side wall; the bottom opening frame, the intermediate connector, and the structural connector are fixed on the metal side wall; the two center-of-gravity adjustment beams are respectively fixed on the upper parts of both ends of the metal side wall.

[0014] Preferably, the center-of-gravity adjustment structure 3 includes a vertically arranged screw rod, the screw rod is connected to the center-of-gravity adjustment beam, several counterweight blocks are arranged on the screw rod, and the counterweight blocks are fixed in position by nuts.

[0015] Preferably, the metal side wall is made of aluminum alloy.

[0016] Preferably, the intermediate connector includes a hull structural connector and a test equipment connector. The hull structural connector is connected to the metal side wall; the test equipment connector is fixed to the hull structural connector. The upper end of the hull structural connector has an installation positioning hole for positioning and connecting with the test tooling.

[0017] Preferably, the outer shell, the metal side wall, the bottom opening frame, the center-of-gravity adjustment beam, the intermediate connector, and the structural connector are all detachably connected.

[0018] Advantages of the present invention:

[0019] (1) Modular design, the bottom of the ship adopts a detachable design, which is convenient for replacing the bottoms with different configurations and the air holes with different apertures.

[0020] (2) The model is light in weight and good in strength. The model adopts a high-strength composite material shell and a metal frame structure is used inside for reinforcement. The overall weight of the model is light and the structural strength is good.

[0021] (3) The weight distribution of the model is reasonable. The center-of-gravity adjustment device is adopted to facilitate the adjustment of the center-of-gravity position. Each component is made of lightweight materials, and more weight is left for installing the test tooling and instrument equipment.

[0022] (4) The bottom of the model ship adopts a transparent design and is drawn with grids, which is convenient for observing and calculating the splashing area. Description of the Drawings

[0023] Figure 1 It is the front view of a cavitation observation test model of a water surface aircraft of the present invention.

[0024] Figure 2 It is the structural schematic diagram of the bottom of the ship.

[0025] Figure 3 It is the structural schematic diagram of the hull.

[0026] Figure 4 It is the structural schematic diagram of the outer shell.

[0027] Figure 5Schematic diagram of the metal side wall structure.

[0028] Figure 6 Schematic diagram of the connecting piece.

[0029] In the figure: 1 is the bottom of the ship, 2 is the hull, 3 is the center of gravity adjusting mechanism, 4 is the hoisting mechanism, 1-1 is the bottom of the ship before the step, 1-2 is the bottom of the ship after the step, 1-2-1 is the metal interface, 2-1 is the outer shell, 2-2 is the metal side wall, 2-3 is the bottom opening frame of the ship, 2-4 is the center of gravity adjusting beam, 2-5 is the intermediate connecting piece, 2-6 is the structural connecting piece, 2-1-1 is the first outer shell, 2-1-2 is the second outer shell, 2-1-3 is the third outer shell, 2-1-4 is the step connecting piece, 2-1-5 is the stern connecting piece, 2-2-1 is the front metal side wall, 2-2-2 is the rear metal side wall, 2-5-1 is the hull structure connecting piece, 2-5-2 is the test equipment connecting piece. Specific implementation manner

[0030] The present invention is realized through the following technical solutions.

[0031] A cavitation observation test model of a surface aircraft, the model includes a bottom of the ship 1, a hull 2, a center of gravity adjusting mechanism 3 and a hoisting mechanism 4, wherein, the bottom of the ship 1 is bonded to the hull 2 to form a waterproof cabin.

[0032] The center of gravity adjusting structure 3 is a metal structural member and is fixed to the hull 2 of the model by screws.

[0033] The hoisting mechanism 4 is four eyebolt screws, which are directly screwed into the metal side walls on both sides of the hull 2.

[0034] The bottom of the ship 1 is composed of a bottom of the ship before the step 1-1 and a bottom of the ship after the step 1-2, wherein the bottom of the ship before the step 1-1 and the bottom of the ship after the step 1-2 are made of transparent acrylic material.

[0035] Square grids are drawn on the bottom of the ship before the step 1-1 and the bottom of the ship after the step 1-2 for observing the bottom splash area.

[0036] A metal interface 1-2-1 is inlaid on the bottom of the ship after the step 1-2, and the inner hole diameter of the metal interface 1-2-1 can be changed by replacing accessories. In this embodiment, there are 4 metal interfaces 1-2-1 in total, which are used to blow compressed air into the model from the inside.

[0037] The hull 2 includes an outer shell 2-1, a metal side wall 2-2, a bottom opening frame 2-3, a center-of-gravity adjustment beam 2-4, an intermediate connector 2-5, and a structural connector 2-6. Among them, the outer shell 2-1 is fixed to the metal side wall 2-2 by screws; the bottom opening frame 2-3 is fixed to the metal side wall 2-2 by screws; there are two sets of center-of-gravity adjustment beams 2-4 in total, which are fixed to the metal side wall 2-2 by screws; the intermediate connector 2-5 is fixed to the metal side wall 2-2 by screws; the structural connector 2-6 is fixed to the metal side wall 2-2 by screws.

[0038] The outer shell 2-1 includes an outer shell one 2-1-1, an outer shell two 2-1-2, an outer shell three 2-1-3, a step connection part 2-1-4, and a stern connection part 2-1-5. Among them, the outer shell one 2-1-1 and the outer shell two 2-1-2 are symmetric composite structures, which are fixed to the step connection part 2-1-4 and the stern connection part 2-1-5 by screws; the outer shell three 2-1-3 is a composite structure, which is fixed to the step connection part 2-1-4 by screws.

[0039] The step connection part 2-1-4 is an aluminum alloy structure.

[0040] The metal side wall 2-2 includes a front metal side wall 2-2-1 and a rear metal side wall 2-2-2. The metal side wall 2-2 is formed by CNC machining of aluminum alloy and is used to transmit and bear loads.

[0041] The intermediate connector 2-5 includes: a hull structure connector 2-5-1 and a test equipment connector 2-5-2. The hull structure connector 2-5-1 is fixed to the metal side wall 2-2 by screws; the test equipment connector 2-5-2 is fixed to the hull structure connector 2-5-1 by screws; the upper end of the hull structure connector 2-5-1 has a mounting positioning hole for positioning connection with the test tooling.

[0042] There are two sets of center-of-gravity adjustment mechanisms 3 in total, which are fixed to the center-of-gravity adjustment beam 2-4 by nuts.

[0043] The protection scope of the present invention is not limited to the above embodiments. Obviously, those skilled in the art can make various changes and deformations to the present invention without departing from the scope of the present invention. If these changes and deformations fall within the scope of the claims of the present invention and their equivalent technologies, the intention of the present invention also includes these changes and deformations.

Claims

1. A water surface aircraft cavitation observation test model, characterized in that: The invention comprises a ship bottom (1) and a hollow ship hull (2), wherein the ship bottom (1) and the ship hull (2) are connected to form a cabin, and a center of gravity adjustment structure (3) and a lifting mechanism (4) are connected to the ship hull (2).

2. A water surface aircraft cavitation observation test model as claimed in claim 1, characterized in that: The ship bottom (1) is V-shaped and is formed by connecting a stepped front ship bottom (1-1) and a stepped rear ship bottom (1-2).

3. A water surface aircraft cavitation observation test model as claimed in claim 2, characterized in that: The boat bottom (1-1) in front of the broken step and the boat bottom (1-2) in the rear of the broken step are both made of transparent acrylic material.

4. A water surface aircraft cavitation observation test model as claimed in claim 2, characterized in that: Square grids are drawn on the bottom of the ship before the step (1-1) and the bottom of the ship after the step (1-2).

5. A water surface aircraft cavitation observation test model as claimed in claim 2, characterized in that: A plurality of metal interfaces (1-2-1) are inlaid on the bottom (1-2) of the ship after the step-break, and compressed air can be blown into the interior of the model through the metal interfaces (1-2-1).

6. A water surface aircraft cavitation observation test model as claimed in claim 1, characterized in that: The hull (2) comprises an outer shell (2-1), a metal side wall (2-2), a bottom frame (2-3), a center of gravity adjustment beam (2-4), an intermediate connecting piece (2-5) and a structural connecting piece (2-6), wherein the outer shell (2-1) is fixed on the outside of the metal side wall (2-2); the bottom frame (2-3), the intermediate connecting piece (2-5) and the structural connecting piece (2-6) are fixed on the metal side wall (2-2); and two center of gravity adjustment beams (2-4) are respectively fixed on the upper parts of both ends of the metal side wall (2-2).

7. A water surface aircraft cavitation observation test model as claimed in claim 6, characterized in that: The center of gravity adjustment structure (3) comprises a vertically arranged screw rod, the screw rod is connected to the center of gravity adjustment beam (2-4), a plurality of counterweight blocks are arranged on the screw rod, and the positions of the counterweight blocks are fixed by nuts.

8. A water surface aircraft cavitation observation test model as claimed in claim 6, characterized in that: The metal side wall (2-2) is made of aluminum alloy.

9. A water surface aircraft cavitation observation test model as claimed in claim 6, characterized in that: The intermediate connecting piece (2-5) comprises a hull structure connecting piece (2-5-1) and a test equipment connecting piece (2-5-2); the hull structure connecting piece (2-5-1) is connected to the metal side wall (2-2); the test equipment connecting piece (2-5-2) is fixed to the hull structure connecting piece (2-5-1); the upper end of the hull structure connecting piece (2-5-1) is provided with an installation positioning hole for positioning and connecting with the test tooling.

10. A water surface aircraft cavitation observation test model as claimed in claim 6, characterized in that: The outer shell (2-1), the metal side wall (2-2), the bottom frame (2-3), the center of gravity adjustment beam (2-4), the middle connecting piece (2-5) and the structural connecting piece (2-6) can all be detachably connected.

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