Sakamoto Shin-ichi, Watanabe Yoshiaki
Faculty of Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan.
Ultrasonics. 2004 Apr;42(1-9):53-6. doi: 10.1016/j.ultras.2004.01.086.
The experimental studies of thermoacoustic cooler consisting of acoustic loop-tube were carried out. The loop-tube was filled with the mixture of air and helium gas or air at atmospheric pressure. The dimensions of the loop-tube were 3.3 m of length, 44 mm of inner diameter and 4 mm of thickness. A pair of stacks (stack 1 and stack 2) which were sandwiched between two heat exchangers was placed symmetrically in the loop-tube. Stack 1 was employed as a prime mover and stack 2 as a heat pump. The self-sustained sound generated by the thermoacoustic effect and the cooling phenomena at the stack 2 were observed. The distribution of the sound pressures and the waveforms in the loop-tube were measured, and the frequency component of the self-sustained sound was investigated at the starting phase. The fundamental frequency component was confirmed and it was developing as the sound pressure increasing. The higher harmonics frequency components were generated and they were also developing.
开展了由声学回热器组成的热声制冷机的实验研究。回热器在大气压下填充空气与氦气的混合物或空气。回热器的尺寸为长度3.3米、内径44毫米、厚度4毫米。一对夹在两个热交换器之间的叠层（叠层1和叠层2）对称放置在回热器中。叠层1用作原动机，叠层2用作热泵。观察到了热声效应产生的自持声以及叠层2处的制冷现象。测量了回热器中声压的分布和波形，并在启动阶段研究了自持声的频率成分。确认了基频成分，并随着声压增加而增强。产生了高次谐波频率成分，且它们也在增强。
