A UHF Plasma Flow Measuring Device

Abstract

The invention discloses an ultrahigh frequency response plasma flow measurement device. The ultrahigh frequency response plasma flow measurement device comprises an amplifier, a frequency and voltage conversion device, a plasma probe or sensor, a modulation-demodulation device and a data acquisition device. A voltage provided by a power source passes through the amplifier and the frequency and voltage conversion device in sequence and produces a high-frequency and high-voltage level, the high-frequency and high-voltage level is applied to the two ends of the plasma probe or sensor, and a plasma field is excised between two electrodes of the plasma probe or between two electrodes of the sensor; incoming current fluctuating speed or wall surface unsteady pressure fluctuation contained in the high-frequency and high-voltage level is detected by a high-voltage probe and transmitted to the modulation-demodulation device, the modulation-demodulation device decomposes the high-frequency and high-voltage level, current field signals are separated from the high-frequency and high-voltage level, and acquisition, storage and analysis are completed in the data acquisition device. By means of the ultrahigh frequency response plasma flow measurement device, the requirements for high spatial resolution and temporal resolution can be met simultaneously, and measurement of current field high-frequency pulsation and a vortex structure is achieved.

Description

technical field [0001] The invention relates to the technical field of high-frequency, high-enthalpy and high-speed unsteady flow field measurement in aerospace, in particular to an ultra-high frequency response plasma flow measurement device for measuring complex three-dimensional unsteady flow field inside a turbomachinery. Background technique [0002] The development of any theory is inseparable from experiments, aerospace high Mach number, high turbulent pulsation, high enthalpy flow cannot be separated, and turbomachinery aerodynamic thermodynamics is also inseparable. Due to the typical three-dimensional, unsteady and complex flow of turbomachinery, which includes high Mach number, high turbulent pulsation, and high enthalpy flow, the measurement of its flow field has always been a problem that needs to be solved in this field. With the rapid development of aviation technology, the design optimization of turbomachinery has also developed from the early one-dimensional...

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Problems solved by technology

[0010] In view of this, the main purpose of the present invention is to provide an ultra-high-frequency response plasma flow measurement device to solve the problem that existing measuring instruments cannot measure high-speed, high-enthalpy, and high-frequency flow fields in detail due to low frequency response and large size. By measuring the high-frequency flow field pulsation structure in the high-speed high-enthalpy flow field, the purpose of quantitatively analyzing the complex flow mechanism inside the turbomachinery is achieved.

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