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中文摘要：
行波热声发动机具有效率高、可靠性好及环保等优点。本文分别以氮气和氦气为工质研究了行波热声发动机的声功输出特性。在平均压力为3．0MPa，输入功率为3000W时，氮气为工质获得最大492．3W输出声功，氦气为工质获得最大691．3W的声功。此外还针对两种不同锥度的锥形谐振管发动机的声功输出特性进行了对比研究．研究表明：设计合理的谐振管一方面能够有效降低加热温度，有利于利用低品位热源；另一方面还能有效地降低损失，在相同的加热量下具有更高的压比、更大的输出声功及效率。
英文摘要：
In this paper, the power output characteristics of traveling-wave thermoacoustic engine （TWTAE） using nitrogen and helium as working gas have been investigated respectively. In the experiments, maximum output acoustic powers of 492.3 W （using N2） and 691.3 W （using He）have been obtained under 3000 W input power and 3.0 MPa mean pressure. In addition, the power output characteristics in contrast of two different tapered resonance tubes in a same TWTAE have been investigated. The results show that the well-designed resonance tube can effectively decrease the temperature of the heating block, which is beneficial to the use of low-temperature heat source. Furthermore, it can minimize the viscous loss, which leads to better system performance in terms of high pressure ratio, high thermal efficiency and more output power for the same heating power of engine.
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