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 disadvantages of the integral Stirling engine are: on the one hand, the introduction of the crank-link mechanism 21 aggravates the wear of the compression piston (generator work output piston 7) and the mass element 17 and the wall surface, and the phase difference between the ejector and the compression piston It 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 drive circuit of a traditional traveling wave thermoacoustic engine-driven power generation system (as shown in Figure 6), the system uses a gas piston instead of an ejector for phase modulation. Although it solves the problem of moving parts, the generator piston cavity The phase of the pressure wave and the velocity wave is dominated by the standing wave component, which requires a larger piston volume to achieve limited work output; in addition, an excessively large piston volume also requires larger and heavier circuit and magnetic circuit materials, making the acoustic Electric conversion volume and weight increase and reduce efficiency

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