液相工质热声热机——低品位热源热机的新方法

LIQUID WORKING SUBSTANCE THERMOACOUSTIC HEAT ENGINE —A NEW DEVICE UTILIZING LOW GRADE HEAT SOURCE

综述了以朗肯循环为基础的低品位热源热机的研究现状，指出采用相变工质是朗肯循环热机的最大优点。简述了热声理论，指出热声转换对工质的本质要求取决于等压热膨胀系数β０。通过对液相工质特性的讨论，指出工作于近临界状态下的液相工质热声热机是利用低品位热源的合理方案。

A summary is given in this paper on state of art in heat engines utilizing low grade heat source based on Rankie thermal cycle which is most advantagouse in adpoting the working substance with phase change.The thermoacoustic theory is introduced in brief and it points out that the isobaric thermal expansion coefficient β 0 is the essential factor for thermal sound conversion.Based on the discusion on the properties of liquid working substance,it is indicated that it is reasonable in utilization of low grade heat source to adopt thermoacoustic heat engine which is working near the critical point of liquid working substance.