Exhaust apparatus for measuring turbulent pressure fluctuations in a downwardly open cavity

By using Tesla coil plasma flow control and multi-layer damping layer design, the problem of gas exhaust at the bottom of the downward-facing cavity was solved, thus improving the accuracy and precision of turbulent pulsating pressure measurement.

CN116358773BActive Publication Date: 2026-07-24HARBIN ENG UNIV
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Patent Information

Application Number
CN202310398425.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-04-14
Publication Date
2026-07-24
Estimated Expiration
2043-04-14

AI Technical Summary

Technical Problem

In gravity-type low-noise water tunnels, circulating water tanks, or cavitation water cylinders, air at the bottom of the downward-facing orifice is difficult to expel effectively, causing gas to mix into the fluid and affecting the accuracy of turbulent pulsating pressure measurements and test results.

Method used

The plasma flow control and the filtration effect of the breathable and waterproof membrane generated by the Tesla coil are combined with the design of multi-layer damping layer and gas box. The plasma discharge device changes the fluid flow mode, and the damping layer and gas box filter out air bubbles, reducing the impact of air bubbles on the measurement results.

Benefits of technology

It effectively removes gas from the bottom of the cavity, reduces the error of turbulent pulsating pressure measurement caused by bubbles, improves acoustic measurement accuracy, reduces background noise interference, and enhances the adaptability and stability of the device.

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Abstract

The application provides an exhaust device for measuring turbulent pulsating pressure of a downward opening cavity, which comprises a damping layer, a self-tapping screw, a first hose, a gas tank, a second hose, a cable, a Tesla coil and a power supply. The damping layer is attached to the bottom of the cavity, the self-tapping screw is embedded into the damping layer, one end of the first hose is connected to the middle of the damping layer, the other end of the first hose is connected to one end of the gas tank, the other end of the gas tank is connected to one end of the second hose, one end of the cable is connected to the damping layer and the bottom of the cavity respectively, the other end of the cable is connected to the Tesla coil, and the other end of the Tesla coil is connected to the power supply. The device utilizes the flow control of the plasma generated by the Tesla coil and the filtering effect of the gas-permeable waterproof membrane in the gas tank, can reliably lead out the bubbles generated in the process of measuring the turbulent pulsating pressure of the cavity due to the change of flow rate, reduces the influence of the bubbles on the test measurement results, and has a good engineering application prospect.
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