带压力放大器的驻波型热声发动机驱动RC负载

Investigation on standing-wave thermoacoustically driven RC load with a pressure amplifier

进行了驻波型热声发动机压力放大器长度对系统性能的影响的模拟及实验研究,发现压力放大器的实际最佳长度应该小于系统波长,并且受热声发动机的加热功率、工作压力和负载大小的影响;在负载声阻固定的情况下,一定范围内振动频率、加热温度、负载入口声功随着压力放大器长度的增大而增大;压力放大器可以提高负载入口声功和效率,在本实验的热声系统中接入3.45 m压力放大器后,热声发动机的效率由1.45%提高到3.32%。

The influence of length of pressure amplifier on the performance of standing-wave thermoaeoustic engine was simulated and investigated experimentally. It is shown that the practical optimum length of the pressure amplifier should be less than the length by one fourth of the system wavelength, and it is also influnced by the input power, working pressure, load and so on. When the acoustic resistance of load is fixed, oscillating frequency, heating temperature and input power to RC load will increase with the length of pressure amplifier in a certain range. In addition, the pressure amplifier amplifies both the acoustic power and the efficiency. The efficiency of the experimental system with a 3.45 m-long pressure amplifier rises from 1.45% to 3.32%.