CN110143254B

CN110143254B - Supercavitation generation device

Info

Publication number: CN110143254B
Application number: CN201910408010.1A
Authority: CN
Inventors: 黄振贵; 罗驭川; 陈志华; 侯宇; 唐楚淳; 郭则庆
Original assignee: Nanjing University of Science and Technology
Current assignee: Nanjing University of Science and Technology
Priority date: 2019-05-15
Filing date: 2019-05-15
Publication date: 2021-09-21
Anticipated expiration: 2039-05-15
Also published as: CN110143254A

Abstract

The invention discloses a supercavitation generating device, which mainly comprises a spring, an isolating device, a slot hole and a navigation body; the head of the navigation body is internally provided with a channel, a spring and an isolating device are arranged in the channel, the spring is connected with the isolating device, a slot hole is arranged below the isolating device, and chemical materials which can react with water to generate a large amount of gas are placed in the slot hole; the isolating device is provided with a hole, and a long hole is dug in the side surface of the head of the navigation body. The invention modifies the exterior of the navigation body, digs a slot hole on the head of the navigation body, places some chemical materials which can react with water to generate a large amount of gas by using an isolation device, the isolation device is designed to be sealed in a normal state, and the supercavitation drag reduction effect of the navigation body movement is improved by a device of gas and liquid in a high-speed movement state.

Description

Supercavitation generation device

Technical Field

The invention relates to a supercavity drag reduction technology, in particular to a supercavity generating device.

Background

In recent years, the super-cavitation anti-drag technology is gradually developed, which brings a profound technical revolution to underwater vehicles and even changes the mode of future naval combat. Reducing the density of the fluid medium surrounding the vehicle is the fundamental principle of supercavitation drag reduction.

The ventilation supercavity technology increases the vacuole area on the surface of the navigation body, develops into supercavity and lays a foundation for greatly improving the navigation speed of the underwater navigation body. The ways of generating the supercavity are mainly divided into three ways, namely increasing the incoming flow speed, reducing the incoming flow pressure and increasing the pressure in the supercavity.

At present, the artificial ventilation supercavity mostly adopts a gas jet method, a liquid jet method and a cavitator method, and the gas jet method is shown in figure 1. The three methods have high requirements on the internal structure of the aircraft, and the interior of the aircraft can continuously spray gas or liquid to the head, and generally can be completed under high experimental conditions, so that the three methods are difficult to apply to the engineering field.

Disclosure of Invention

The invention aims to provide a supercavitation generation device.

The technical solution for realizing the purpose of the invention is as follows: a supercavitation generation device mainly comprises a spring, an isolation device, a slot hole and a navigation body;

the head of the navigation body is internally provided with a channel, a spring and an isolating device are arranged in the channel, the spring is connected with the isolating device, a slot hole is arranged below the isolating device, and chemical materials which can react with water to generate a large amount of gas are placed in the slot hole; the isolating device is provided with a hole, and a long hole is dug in the side surface of the head of the navigation body.

Compared with the prior art, the invention has the following remarkable advantages: the invention modifies the exterior of the navigation body, digs a slot hole on the head of the navigation body, places some chemical materials which can react with water to generate a large amount of gas by using an isolation device, the isolation device is designed to be sealed in a normal state, and the supercavitation drag reduction effect of the navigation body movement is improved by a device of gas and liquid in a high-speed movement state.

Drawings

FIG. 1 is a schematic view of an artificially aerated supercavity.

Fig. 2 is a schematic view of the retrofit design of the present invention.

FIG. 3 is a schematic view of a supercavitation generating apparatus according to the present invention.

Fig. 4 is a sectional view a-a of the supercavitation creation device shown in fig. 3.

Detailed Description

In order to improve the supercavity drag reduction effect of the navigation body movement, the invention provides a method for effectively helping the formation and the persistence of supercavity. The exterior of the navigation body is modified, and the slot is dug on the head or the side of the navigation body, as shown in figure 2. Some chemical materials that react with water to produce large amounts of gas are placed in an isolation device. The isolation device is designed to be sealed in a normal state and to pass through a gas and liquid device in a high-speed motion state.

As shown in fig. 3 and 4, a device for generating supercavitation mainly comprises a spring 1, an isolating device 2, a slot 3 and a navigation body 4;

channels are arranged inside two sides of the head of the navigation body 4, and the spring 1 is connected with the isolating device 2 and is arranged in the channels on two sides of the head of the navigation body 4; the isolating device 2 is provided with holes, a slot 3 is arranged below the isolating device 2, and chemical materials which can react with water to generate a large amount of gas are placed in the slot 3; a long hole is dug in the side face of the head of the navigation body 4, and when the navigation body 4 is static, the hole of the isolation device 2 is staggered with the long hole in the side face of the head of the navigation body 4; when the navigation body 4 moves, the hole of the isolation device 2 is overlapped with the long hole on the side surface of the head of the navigation body 4.

Furthermore, each side is provided with 3 springs 1, and each side of the isolating device 2 is provided with 6 holes.

Further, the arrangement direction of the spring 1 and the isolating device 2 is parallel to the conical shell of the head of the navigation body.

Furthermore, the chemical materials placed in the slotted hole 3 are metallic sodium and CaO₂Ammonium or carbonate salts.

The present invention will be described in detail with reference to examples.

Examples

A device for generating supercavitation is mainly composed of a spring 1, an isolating device 2, a slot hole 3 and a navigation body 4, as shown in figures 3 and 4, when the navigation body moves at a high speed (more than 100m/s), the isolating device can move relatively due to the inertia effect, at the moment, a hole in the isolating device is attached to a long hole dug out of the exterior of the navigation body, and water enters the slot hole and reacts with chemical materials to generate a large amount of gas continuously.

The spring is fixed with the isolation device to limit the movement of the isolation device.

The isolating device is provided with 6 holes, and chemical materials which can react with water to generate a large amount of gas are arranged in the slots below the isolating device. The side of the head of the navigation body is provided with a long hole which is staggered with the hole of the isolating device.

The slot hole below the navigation body isolation device is provided with chemical materials which can react with water to generate a large amount of gas, such as: 1 active metal such as metallic sodium; 2 peroxide: CaO (CaO)₂Etc.; 3 ammonium salt with strong hydrolytic ability; 4 carbonate with strong hydrolytic ability.

Claims

1. A supercavitation generation device is characterized by mainly comprising a spring (1), an isolation device (2), a slot hole (3) and a navigation body (4);

a channel is arranged in the head of the navigation body (4), a spring (1) and an isolating device (2) are arranged in the channel, the spring (1) is connected with the isolating device (2), a slotted hole (3) is arranged below the isolating device (2), and chemical materials capable of reacting with water to generate a large amount of gas are placed in the slotted hole (3); holes are drilled on the isolating device (2), and long holes are dug on the side surface of the head of the navigation body (4); the arrangement directions of the spring (1) and the isolating device (2) are parallel to the conical shell at the head of the navigation body;

when the navigation body (4) is static or moves at a constant speed, the hole of the isolation device (2) is staggered with the long hole on the side surface of the head of the navigation body (4); when the navigation body accelerates or decelerates, the isolation device generates relative motion due to the inertia effect, at the moment, the hole on the isolation device is overlapped with the long hole dug out of the navigation body, and water enters the slotted hole to generate chemical reaction with chemical materials to continuously generate a large amount of gas.

2. A supercavitation generating device according to claim 1, characterised in that the springs (1) are arranged on both sides of the head of the vehicle (4), 3 springs (1) being arranged on each side.

3. A supercavity generating device according to claim 1, characterized in that the isolating means (2) of each side is perforated with 6 holes.

4. A supercavitation generating device according to claim 1, characterised in that the chemical material placed in the slots (3) is metallic sodium, CaO₂Ammonium or carbonate salts.