Thermoacousticaily driven pulse tube refrigeration below 80 K by introducing an acoustic pressure amplifier

摘要

A copper tube of 3.3 m in length and 8 mm in inner diameter, acting as an acoustic pressure amplifier, was incorporated in a standing-wave thermoacoustically driven pulse tube refrigerator system. The enhancement of pressure ratio from 1.129 to 1.152 by the acoustic pressure amplifier has been obtained. As a result, a cooling temperature as low as 79.7 K and a tripled coefficient of performance improvement at 120 K were reached.