Electricity generating system driven by traveling wave thermoacoustic engine

Abstract

The invention discloses a fluctuation thermoacoustic generation system, which comprises the following loop parts in sequence: cold junction heat exchanger, heat regenerator, heater, heat buffer pipe, hot junction heat exchanger, ring-shaped connection pipe and line generator in the pipe, wherein the generator contains a cylinder with one end of casing on the pipe and the other end with line sliding bearing; a double-loop magnetic-inductive soft iron with ring orifice is set in the cavity between cylinder and casing; the permanent magnet is inserted in the outer ring magnetic wall of soft iron; the coil rack is fixed on cylinder inner wall with part of coil in the ring orifice; the elastic or quality component is set in the hot junction pipe; the quality component does shift sliding along the elastic element; the elastic or quality phase modulation component is set in the greenhouse pipe; the quality component does shift sliding along the elastic phase modulation element. The invention can adjust the phase difference of pressure fluctuation and bulk flow fluctuation, which feedbacks the acoustic power to accomplish high effective Stirling cycle as well as inhibits the loop ring current to improve property of entire machine.

Description

technical field [0001] The invention relates to a thermoacoustic power generation device, in particular to a power generation system driven by traveling wave thermoacoustics. Background technique [0002] The traveling wave thermoacoustic Stirling engine has the advantages of high efficiency, good energy adaptability, and no moving parts. A traveling-wave thermoacoustic Stirling engine can efficiently convert various heat sources (including waste heat) into mechanical work, and a linear generator can realize the conversion of mechanical energy into electrical work. [0003] For a linear generator, the sound work input into the generator is given by the following equation: [0004] W = 1 2 Re [ p ~ U * ~ ] = 1 2 | ...

AI Technical Summary

Problems solved by technology

The disadvantage of the integral Stirling engine is: on the one hand, the introduction of the crank-link mechanism 21 has aggravated the wear of the compression piston (generator piston 7) and the discharger piston (phase-modulating piston 17) and the wall surface, and the displacement between the discharger and the compression The phase difference of the piston is not adjustable for different working conditions; in addition, the excluder of the integral Stirling engine works at high temperature, which reduces the service life

Its disadvantages are: on the one hand, the introduction of moving parts increases the complexity of the system; on the other hand, the ejector will move between high temperature and low temperature ends, which is unfavorable for the work of the ejector

In the driving circuit of the traditional traveling wave thermoacoustic engine driving power generation system (such as Image 6 As shown), the system uses a gas piston to replace the ejector for phase modulation. Although it solves the problem of moving parts, the phase of the pressure wave and velocity wave in the generator piston cavity is dominated by the standing wave component, which requires a large Only the volume of the piston can achieve limited work output; in addition, the excessive piston volume also requires larger and heavier circuit and magnetic circuit materials, which increases the volume and weight of the acoustic-electric conversion, and reduces the efficiency

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