行波热声发动机可与各种声学负载耦合,在对耦合位置的研究基础上,进一步开展负载末端耦合时行波热声发动机的性能研究.同时改变直管谐振管内径和长度,使频率恒为67.7 Hz,保证发动机环路声功转换特性一致.研究表明,当谐振管内径为120 mm时,系统性能最好;以氦气为工质,在平均压力3 MPa、加热功率2 000 W、热端温度923 K、内壁相对粗糙度为0.0 007时获得最大输出声功512 W.谐振管内径、内壁相对粗糙度和负载阻抗相位对发动机性能有显著影响;选择合适的谐振管,可以降低热端温度,减少管内损失,提高声功输出能力和整机效率;同时可以一定程度上减小内壁粗糙度对发动机性能的影响.%Based on previous studies, the performance of a traveling-wave thermoacoustic engine with end coupling RC load was further studied. The inner diameter and length of the straight resonance tube were changed at the same time, so that the frequency was kept at 67.7 Hz to ensure the same acoustic power conversion characteristics inside the engine loop. The results indicate that when the inner diameter of resonance tube is 120 mm, the system has the best performance. A maximum output acoustic power of 512 W (using helium) were obtained with 2 kW input heating power, 3 MPa mean pressure, 923 K hot temperature and 0. 000 7 relative wall roughness of resonance tube. Inner wall roughness of resonance tube, inner diameter of resonance tube and phase of load impedance have apparent influence on the performance of traveling-wave thermoacoustic engine. A suitable resonance tube can lower the hot temperature, reduce the loss of the resonance tube, improve the acoustic power output capacity and efficiency, and the influence of inner wall roughness of resonance tube also can be weakened to some extent.
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