This article introduces the latest progress of a 300 Hz thermoacoustically driven pulse tube cooler. Based on the experience of former experiments, improvements have been made in the standing-wave engine, pulse tube cooler and their coupling mechanism. An inlet pressure ratio of 1.248 was obtained with the mean pressure and heating power of 4.13 MPa and 1760 W, respectively. A lowest no-load temperature of 69.5 K has been reached under this condition. This is the first time for thermoacousti- cally driven pulse tube coolers to reach the temperature below 70 K with such a high frequency.
Experimental investigation on a traveling-wave thermoacoustic electricity generator is presented. In the experiment, more than 100 W electrical power was achieved under 2.5 MPa mean pressure, 64 Hz working frequency and 0.2 MPa pressure amplitude.
