谐振管是热声热机的主要部件之一,减小声功在谐振管中的耗散对改善热声热机输出特性具有积极意义.由于近临界区流体的热物性具有特殊性,用其作为工质时将会对谐振管内的声功损耗产生重要影响.本文对声功在以近临界区CO2为工质的谐振管中的损耗情况进行了计算和分析.结果显示,在本文的计算条件下,相较于压力较低的CO2,采用近临界区CO2作为工质可降低谐振管内的声功损耗,并在工作压力略低于临界压力时,谐振管内的声功损耗可达到最小值.此外,在保持谐振频率不变的情况下,采用近临界区CO2作为工质可一定程度上缩短谐振管的长度.
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