Flow control device and method for improving stability of ventilation cavitation bubbles

Abstract

The invention discloses a flow control device and method for improving ventilation cavitation stability. The flow control device comprises a cavitator, an air guide bowl, a ventilation pipeline, a spiral assembly, a flow controller and the like. High-pressure airflow enters an interlayer through an air inlet hole along a ventilation pipeline, is finally exhausted from an exhaust hole to form swirling airflow and impacts a spiral assembly to make the spiral assembly rotate around a super air bubble underwater vehicle, the flow controller is additionally arranged on a traditional cavitation device, the air in the cavitation device is made to rotate, internal energy of the high-pressure airflow is converted into axial and tangential kinetic energy, and thereby active control over the cavitation form is achieved. The flow control method for improving stability of the ventilation cavitation bubbles is advantaged in that the generation rate of the ventilation cavitation bubbles can be increased, generation of liquid backflow flow in the cavitation bubbles is inhibited, the cavitation bubbles are rapidly generated till the cavitation bubbles wrap the whole underwater navigation body to form a supercavitation state, and thereby frictional resistance of the surface of the underwater navigation body is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of underwater vehicle supercavitation technology, in particular to a flow control device and method for improving the stability of ventilation cavitation. Background technique [0002] With the continuous advancement of science and technology, it originated from the subversive understanding of cavitation theory. It was previously believed that the cavitation phenomenon of propeller blades would reduce the propulsion efficiency, and the generation of cavitation should be suppressed. Later, it was found that when the underwater vehicle sails at high speed The cavitation phenomenon that appears has shown excellent results in reducing surface frictional resistance, which has attracted widespread attention from researchers at home and abroad. After continuous and in-depth research and study, it has finally developed into artificial ventilation supercavitation technology. The basic principle is By ventilating the ...

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Problems solved by technology

[0005] At present, most of the existing studies on the stability of the cavitation shape adopt the method of changing the shape of the cavitator and adjusting the ventilation flow rate. Under the action of sudden increase, interface instability or even collapse is easy to occur. How to improve the stability of the supercavitation form of underwater vehicles under complex disturbances is an urgent problem to be solved.

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