Abstract

In order to minimize the size and weight of the micro coaxial Stirling-type pulse tube cryocooler (MCSPTC), the traditional reservoir can be removed. In this paper, a two-dimensional axis-symmetric CFD model of a MCSPTC operating at over 100 Hz without reservoirs is established, and its performance characteristics are conducted. After removing the reservoir, the geometrical dimensions of several key components, including the pulse tube, the regenerator, heat exchangers and inertance tubes, will be optimized simultaneously. In addition, the effect of operating frequency on flow and transfer processes in the regenerator and pulse tube is analyzed, and an optimal frequency of 125 Hz can be determined based on the CFD model. As a result, a no-load temperature of 54.8 K and a cooling capacity of 0.92 W at 80 K can be obtained. The total weight of the cooler is only about 0.7 kg.

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