行波热声发动机驱动的脉管制冷机研究

Investigation on a pulse tube cooler driven by a traveling wave thermoacoustic enging

通过改变热声发动机谐振直路长度,研究系统在不同工作频率下的性能。研究发现,在一定条件下降低频率可以显著改善脉管制冷机的性能。在工作压力为 2 7MPa,加热功率为 2 350W,工作频率为 45Hz时,双向进气型单级脉管制冷机获得了 80 9K的最低制冷温度,这是目前用热声制冷方法获得的最低制冷温度。

A thermoacoustically driven pulse tube cooler (PTC) system eliminates mechanical moving parts. So it has the merits of simplicity, long lifetime and reliability, which makes it have great application potential in natural gas liquefaction, infrared electronics cooling and life refrigeration. Improving the frequency matching between thermoacoustic engines and PTC system is an effective way to increase the performance of the coupled refrigeration system. Investigation on a thermoacoustically driven PTC system under different operating frequency was carried out by changing the length of the resonance straight tube of a thermoacoustic Stirling engine. With working pressure and heating power of 2.7 MPa and 2 350 W, respectively, a single stage double inlet PTC reaches the refrigeration temperature of 80.9 K at 45 Hz, which is a new record for the thermoacoustically driven PTC.