Launching device for water super cavity and high-speed object to access water

Abstract

The invention discloses a launching device for a water super cavity and a high-speed object to access water. The launching device comprises a high-pressure gas source, a box support frame, a high-speed photographing instrument, an industrial control computer, a diaphragm, a safety interceptor, a water tank, a ball valve, a launching tube, a flat plate, a pressure gauge, an electromagnetic valve, a tube valve connector, a cylinder valve connector, a high-pressure cylinder, a supporting plate, a supporting column, a gas conduit interface, a gas pressure measurement interface and a gas control switch. A tested object is driven and accelerated through nitrogen released by the high-pressure gas source, and is launched by the launching tube to enter the water tank; and when the tested object passes through the free surface of liquid from top to bottom and from bottom to top, a flow field together with inlet water and outlet water generated by the super cavity is generated. By using various optical instruments and flow field visualized instruments together, the collapse principle of cavitation bubbles around the object when the high-speed object accesses the water and the complex fluid dynamics behavior between two nonlinear free boundaries of the liquid surface and the cavity surface revolved when the high-speed object vertically accesses the water can be researched.

Description

technical field [0001] The invention relates to a fluid pressure generator in fluid mechanics, in particular to a launching device for supercavitation in water and high-speed objects entering and exiting water. Background technique [0002] "Supercavitation technology" is an emerging technology that reduces the wetted area of ​​the vehicle by continuously providing air bubbles around the underwater vehicle, thereby reducing the running resistance of the vehicle. Since the liquid in the direct contact part of the supercavity flow zone and the object surface has been vaporized, the density of the gas is usually much smaller than that of air (for example, at 27 °C, the density of water vapor is 0.02558kg / m 3 , about 1 / 50 of the density of air), the resistance of an object moving in supercavitation in water can be about 850 times smaller than that of flying in air, and it can make the underwater high-speed moving body obtain 90% drag reduction . The underwater supercavitation ...

AI Technical Summary

Problems solved by technology

In my country, the basic experimental research on the natural supercavitation induced by high-speed objects entering and leaving water has just started. Most of the relevant research units are carried out in water tunnels. German number Fr The effect of large impact, the deformation of the cavitation is serious, it is difficult to accurately analyze the morphological characteristics of the cavitation

The main reason for the above phenomenon is that there is no high-speed object launching device that can better realize the research on supercavitation in water and water entry and exit.

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