Thermo-acoustic process testing system and testing method

Abstract

The invention provides a thermo-acoustic process testing system and a thermo-acoustic process testing method. The testing system comprises an acoustic field modulation unit, a flow field measurement window, a temperature field measurement window, a micro-scale particle imaging speedometer, a thermal infrared imager and a time-space image mapping and superposing unit. The testing method comprises the following steps of: 1) generating temperature fields, and acoustic fields with stable frequencies, amplitudes and phase angles at the two ends of a thermo-acoustic core; 2) measuring flow field distribution in the thermo-acoustic core at a series of sampling time points tc; 3) measuring a temperature field distribution process along with time variation in the thermo-acoustic core; 4) equivalently converting the flow field distribution at each sample time point tc into the flow field distribution at a virtual sampling time point tc' in the same period T of an acoustic field according to a sampling time point serial number; and 5) acquiring the correspondence between the flow field distribution and the temperature field distribution along with time variation. By the system and the method, the temperature fields and the acoustic fields in the thermo-acoustic core can be synchronously measured, and a measurement result really reflects an actual thermo-acoustic process.

Description

technical field [0001] The invention relates to the technical fields of thermodynamics, fluid mechanics and acoustics, in particular, the invention relates to a thermoacoustic testing system and testing method for thermoacoustic heat engines. Background technique [0002] Thermoacoustic heat engine is a new type of high-efficiency heat engine. It uses the thermoacoustic phenomenon in physics to make the working gas complete the thermodynamic microcirculation on the mesoscopic level in the microstructure channel of the thermoacoustic element, and directly realize the heat energy to sound energy (mechanical energy) mutual conversion. The entire heat engine system is only the oscillation of the gas working medium itself, without any moving parts, the system is simple, there are no moving parts, and there is no life limit in principle. Thermoacoustic heat engines have brought about a revolution in heat engines. Thermoacoustics is the intersection of heat and acoustics. It is ne...

AI Technical Summary

Problems solved by technology

However, in the prior art, due to the limitation of the tracer technology, the MicroPIV of the prior art is only used to measure the liquid working medium with low-speed directional flow

The thermoacoustic heat engine uses gas working fluids such as nitrogen and helium, and these gas working fluids work in an alternating fluctuating state. The measurement technology of the liquid flow field cannot reflect the instantaneous changes of the gas microgroups in the thermoacoustic heat engine.

[0007] More importantly, the same thermoacoustic core can realize different thermodynamic cycles in different sound fields, and the existing technology cannot measure the temperature field and sound field simultaneously, so it cannot reflect the interaction between the temperature field and the sound field in the thermoacoustic process. coupling effect, the measurement results cannot truly reflect the actual thermoacoustic process

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