Plasma flow visualization device based on glow discharge principle

Abstract

The invention discloses a plasma flow visualization device based on a glow discharge principle. The plasma flow visualization device comprises a plurality of electrode couples composed of anode electrodes and cathode electrodes, an insulating plate, a dividing wall, an amplifier, a variable voltage variable frequency device, a high-voltage probe, a modulation-demodulation device and a data acquisition device. Three-phase electricity provided by an external power supply is sequentially converted into high-frequency high-voltage alternating currents through the amplifier and the variable voltage variable frequency device, the high-frequency high-voltage alternating currents are loaded to the anode electrodes and the cathode electrodes of the electrode couples, plasma fields are generated between the anode electrodes and the cathode electrodes, high-frequency high voltage between the anode electrodes and the cathode electrodes is obtained through the high-voltage probe, the modulation-demodulation device is adopted to separate originally-applied high-frequency high voltage from an incoming flow unsteady pressure fluctuation, the unsteady pressure fluctuation is collected and analyzed through the data acquisition device at last, a real unsteady pressure fluctuation of a wall is restored, and displaying of real flow fields is achieved.

Description

technical field [0001] The invention relates to the technical field of display and measurement of unsteady flow field on the wall surface of turbomachinery in aerospace technology, in particular to a plasma flow display device based on glow discharge principle for displaying unsteady flow field on the inner wall surface of turbomachinery. Background technique [0002] Due to the complexity of the internal flow of the turbomachinery, it is embodied in: strong three-dimensionality, reverse pressure gradient, shock wave interference, aerodynamic instability, etc. These factors are mutually coupled and stimulated under the condition of following different nonlinear laws, and have always been the driving force behind the basic and applied research on the flow inside the compressor. In addition, with the continuous update of turbomachinery design methods, it has also developed from the early one-dimensional design to the current full three-dimensional unsteady multi-stage matching...

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Problems solved by technology

[0009] In view of this, the main purpose of the present invention is to provide a plasma flow display device based on the principle of glow discharge, to solve the problems of the existing flow display measurement device on the flow field interference, insufficient frequency response and poor tracking of missing particles, etc., to achieve The measurement and display of the continuous change of the real flow field details on the wall surface achieves the purpose of qualitative and quantitative analysis of the complex flow mechanism inside the turbomachinery

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