工质对热声发动机的性能有重要的影响.为了进一步增加热声发动机的压力振幅,降低其频率,本文在行波热声发动机中采用CO_2作工质,对采用N_2和CO_2作工质的热声发动机内部声场、压力特性和频率特性进行理论预测,并开展了一系列实验研究.实验结果和理论结果比较吻合,采用CO_2在行波热声发动机中获得1.3的最大压比,对应的压力振幅为0.222 MPa,工作频率降低到18 Hz附近.与N_2相比,采用CO_2提高了行波热声发动机压力振幅的性能.
Working substance has a great influence on the performance of a thermoacoustic engine (TE).CO_2 was used as working substance to further increase the pressure amplitude of a TE and reduce its frequency.The internal acoustic field,pressure and frequency characteristics of a TE with N_2 and CO_2 were predicted by calculation.Experimental verification was also made.Good agreement between theoretical and experimental results is obtained.With CO_2,the pressure ratio and pressure amplitude of the TE reach 1.3 and 0.222 MPa,and the frequency decreases to 18 Hz.Compared with N_2,the pressure amplitude performance of the TE with CO_2 is improved.
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