热声制冷机板叠内气体的微观热力循环分析

Analysis of micro thermodynamic cycle of gas in the stacks of thermoacoustic refrigerator

基于线性小振幅声场,探讨了气体微团与固体板叠之间能量传递规律,系统地分析了谐振腔板叠内的热力过程。利用物理上直观的拉格朗日法,阐述了气体微团与固体板叠之间的热量交换。通过分析一个气团总声能量的变化图,直观地了解气体微团与固体板叠之间热量交换的数值变化关系。结果表明驻波型声场板叠中的不同气体微团之间,像是一个个配合精巧、功能齐全的微型制冷机,气体微团通过接力作用,实现板叠上热量的搬移,在低温端得到制冷量。

Based on the theory of linear small amplitude sound field, the energy transfer between the gas micro mass and the solid plate was discussed. The thermal process of the cavity plate stack was analyzed systematically. Lagrange method was adopted to study the heat exchange between the solid pack and gas mass. By analyzing the variation of the diagrams of total acoustic energy in one mass, the change in value of the heat exchange between gas micro mass and solid plate can be obsrved. The results show that different gas micro masses in the standing wave sound field, like some mini refrigerators, which cooperate with each oth- er delicately and have complete functions. Through the relay action of gas micro mass, the heat on the plate is remored and obtained refrigerating capacity at the low temperature end is obtained.