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最近我们研究小组提出了一种声学共振行波热声发电机,它由三个相同的热声发动机核心单元,三台直线电机通过细长的谐振管连接起来.为了考察单个热声发动机核心单元的热功转换性能,我们搭建了热声发动机核心单元热功转换性能测试实验台.该实验台由两台压缩电机,热声发动机核心单元和两台膨胀电机组成.通过改变膨胀电机的电容和电阻,可以改变膨胀电机的阻抗,从而改变热声发动机核心单元的热功转换性能.经过模拟,我们确定了核心单元最佳工作阻抗范围.实验中当负载阻抗幅值为1.19× 107 Pa·s/m3,相位为60°时,获得最高净声功1046W和最高热声效率25.52％.由于热声发动机核心单元的漏热,实验结果和模拟结果在热声效率上相差较大.“,”Recently,our group proposed an acoustically resonant traveling-wave thermoacoustic electric generator,which consists of three engine units and three linear alternators connected end-to-end by slim resonance tubes.For better understanding the thermoacoustic conversion characteristic of the engine unit,an experimental setup was developed.In this system,two linear motors acted as compressor to provide acoustic work for the engine unit and the other two linear motors served as alternator to consume the acoustic work out of the unit.The thermoacoustic conversion characteristic of the engine unit will be changed by connecting different resistance and electric capacitance to the alternator.The best operation impedance of the alternator has been obtained according to the simulation.In the experiment,the highest net output acoustic work of 1046 W with highest thermoacoustic efficiency of 25.52％ was gained simultaneously when the impedance of the alternator was 1.19×107 Pa·s/m3 at 60° But there is a difference between the simulation and experimental results in thermoacoustic efficiency because of the heat loss of the engine unit.