热声板叠，回热器与混合工质耦合作用强化热声制冷效应

Thermoacoustic refrigeration driven by heat energy is a new refrigeration method without any moving parts. The coupled function of thermoacoustic stack, regenerator and mixed working fluid is studied in this project. Theoretically, the operation mechanisms of thermoacoustic stack and regenerator are researched, and the comparison between them in energy conversion of heat and work is carrid out. The match between the thermoacoustic prime mover and the pulse tube refrigerator is analyzed. The study on the thermal loss and the pressure drop in the regenerator and the thermoacoustic effect of the stack with the binary mixed working fluids of helium and other noble gases shows the possibility of the improved performance of the thermoacoustically driven pulse tube refrigeration with mixtures as working gases. In the experiments of the thermoacoustically driven pulse tube refrigeration, refrigeration temperatures of 119.7K and 117.6K are obtained with pure helium and helium-argon mixture respectively. It is the first time to enter the cryotemperature range with the thermoacoustic refrigeration in China, and the experimental results are also on top level in the world.

从热力学理论出发，着重研究热声机械中的核心部件热声板叠，回热器与混合工质之间的藕荷作用，寻求热声板叠，回热器与混合工质之间的相互作用机理，考察提高热声转换效率的有效途径，为热声机械的实用化创造条件。