Standing wave gas-liquid phase change thermoacoustic engine driven by low-grade heat source

A low-grade heat source and thermoacoustic engine technology, which is applied in the direction of machines/engines, mechanical power generating mechanisms, mechanical equipment, etc., can solve the problems of low energy density, high temperature of driving heat source, and difficulty in directly using low-grade heat source, etc., to achieve Realization of miniaturization and optimization of acoustic impedance
CN102734099BActive Publication Date: 2016-08-31ZHEJIANG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ZHEJIANG UNIV
Publication Date
2016-08-31

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Abstract

The invention discloses a low-grade heat source driven standing wave type gas and liquid phase change thermoacoustic engine. The thermoacoustic engine comprises a first heater, a first thermal buffering pipe, a first cooler, a U-shaped pipe, a second cooler, a second thermal buffering pipe and a second heater which are connected sequentially, wherein a liquid piston is arranged in the U-shaped pipe. The thermoacoustic exchange is realized based on a gas and liquid phase change thermoacoustic effect, and the ideal thermodynamic cycle can be approximately two isobaric processes and two adiabatic processes. Compared with the conventional gas medium thermoacoustic engine system, the thermoacoustic engine has the characteristics that the temperature difference of cold and heat sources is low, the thermoacoustic engine can run in small temperature difference and at a large pressure ratio, and the low-grade heat source can be utilized; the energy density of unit volume is high, so that the system can be miniaturized; and the gas and liquid coupled oscillation can be realized, and the acoustic impedance of the thermoacoustic engine system can be optimized by comprehensively utilizing the compressibility of gaseous medium, and the high-density mass inertia of the liquid medium.
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Description

technical field

[0001] The invention relates to a heat engine device, in particular to a thermoacoustic engine driven by a low-grade heat source. Background technique

[0002] The thermoacoustic engine is also called a thermoacoustic compressor, or a thermoacoustic driver. It is only composed of a heat exchanger and a pipe section. It has no mechanical moving parts except for the alternating fluid working fluid. Therefore, it has a simple structure, stable and reliable operation, and a long life. Longevity and other characteristics have attracted the attention of academia and industry.

[0003] Thermoacoustic engines usually use gas as the working medium, and use the thermal interaction between the gas sound field and the solid boundary in the regenerator (or plate stack) to convert thermal energy into mechanical energy. When the temperature gradient of the device (or plate stack) is greater than the critical value, the gas working medium will produce self-excited oscillati...

Claims

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