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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CO_2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CO_2,采用近临界区CO_2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CO_2作为工质可一定程度上缩短谐振管的长度。
The resonance tube is one of the main components of the thermoacoustic heat engine. Reducing the dissipation of sound power in the resonance tube has a positive meaning to improve the output characteristics of the thermoacoustic heat engine. Due to the particularity of the thermophysical properties of near-critical fluid, the use of it as a working fluid will have a significant impact on the acoustic power loss in the resonant tube. In this paper, the acoustic work is calculated and analyzed in the resonant tube with working fluid near the critical region CO_2. The results show that under the condition of this paper, compared with the lower pressure CO_2, using the near-critical region CO_2 as the working fluid can reduce the acoustic loss in the resonance tube. When the working pressure is slightly lower than the critical pressure, The sound power loss can reach the minimum value.In addition, while maintaining the same resonant frequency, the use of near-critical area CO_2 as a working fluid can reduce the length of the resonance tube to some extent.