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以氮气为工质进行了热声谐振管的自激振荡实验 ,通过实验对热声谐振管的起振温度差、自激振荡频率和压力振幅进行了研究 ,研究结果表明 ,热声谐振管的自激振荡频率随着驻波管长度的增加而减小 ,当驻波管长为 2 .2 7m时 ,振荡频率为 65.8Hz;当驻波管长为 3 .77m时 ,振荡频率为 4 2 .1 Hz;热声谐振管的振幅随着回热器两端温度差的增加而增加 ,实验中达到的最大压力振幅为充气压力的 4 .95% ;回热器两端的起振温度差受到充气压力的影响 ,实验中当充气压力为 4× 1 0 5Pa时起振温度差最小 .
The experiment of self excited oscillation of thermoacoustic resonator was carried out by using nitrogen as the working fluid. The difference of the starting temperature, the self oscillating frequency and the pressure amplitude of the thermoacoustic resonator were studied experimentally. The results show that the thermoacoustic resonator The oscillation frequency decreases with the increase of the length of standing wave tube. When the length of standing wave tube is 2.27 m, the oscillation frequency is 65.8 Hz. When the length of standing wave tube is 3.77 m, the oscillation frequency is 42 .1 Hz; the amplitude of the thermoacoustic resonator increases with the increase of the temperature difference between both ends of the regenerator, and the maximum pressure amplitude reached in experiment is 4.95% of the charge pressure; Inflation pressure, the experiment when the inflation pressure of 4 × 105Pa when the minimum temperature difference between the start-up.