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中文摘要：
热声制冷的基本原理是热声效应，但热声效应一般只在高声强下发生，随之将产生强烈的非线性效应。本文在自行研制的热声制冷机试验台上，研究了板叠对声场非线性的影响以及非线性对热声系统性能的影响。结果表明，板叠的存在使得声波明显衰减，压比约减小5％，并且各次谐波的幅值和增长速率较无板叠时均有所降低；非线性效应限制了基波的增长，导致了高次谐波产生，且基波和高次谐波的增长均有发展为饱和的趋势。板叠的存在产生明显的声制冷效果，制冷温度随驱动功率增大先增加后减小，在50W时达到最低温度5．1℃。
英文摘要：
Thermoacoustic refrigerators based on thermoacoustic effect generally work with high amplitude sound waves, which could go with intense nonlinearities. In present work, an experimental apparatus of thermoacoustic refrigeration was built up to investigate the effect of stacks on nonlinearities and the effect of nonlinearities on the performance of thermoacoustic refrigerator. Experimental results indicate that while with stacks in the resonator, acoustic wave amplitudes are weakened, pres- sure ratios are cut down by 5%, high harmonic amplitudes and growth rates are decreased compared with the case of no stacks; nonlinear effect stabilizes the sound wave and causes the production of high harmonics, moreover, both the growth rates of sound wave and high harmonics are tend to be flat; the thermoacoustic effect is obvious while with stacks in the resonator, and no-load temperatures are increased first and decreased then as the acoustic powers are increased, which reach the lowest value 5.1℃ while the acoustic power is 50 W.
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