Theoretical And Experimental Study Of Stirling Type Pulse Tube Cooler

The Stirling type pulse tube cooler with no moving part in low temperature range has the advantages of simple and compact structure, high reliability and coefficient of performance (COP), which attracts much attention in the field of cryocooler. Pulse tube coolers driven by thermoacoustic engine can realize completely no mechanical moving part from ambient to cryogenic temperature. It has broad application prospects in refrigeration and cryogenic fields.After a review of the history and recent development of pulse tube cooler and thermoacoustic engine, the theories of pulse tube cooler and thermoacoustics are introduced. In order to improve the design theory of pulse tube cooler, further research on the design of pulse tube cooler and the theory of inertance tube phase shifting model has been made, mainly including the following sections:1. Design of pulse tube cooler A complete design method of Stirling type pulse tube cooler is introduced based on the NIST numerical regenerator simulation software known as REGEN and phase shifting theory. Two Stirling type pulse tube coolers named PT07 and PT08 are designed and fabricated using this method.2. Quantitative study of inertance tube phase shifting theory Deep study on the theoretical model of inertance tube phase shifting mechanism is made, which improves the phase shifting mechanism design method. The effects of parameters such as PV work, pressure ratio, reservoir volume, working frequency and the temperature of phase shifting mechanism on phase shifting angle of inertance tube are quantitatively studied. The calculations agree well with experimental results, which indicates that the model is instructive on the optimization of the dimension of inertance tube in Stirling type pulse tube cooler.3. Experimental study on pulse tube cooler Experimental study on pulse tube cooler driven by linear compressor and thermoacoustic engine has been done, respectively. With helium as working gas, no-load cold end temperatures of 77 K and 76.3 K are achieved on PT07 and PT08 when driven by a linear compressor, respectively. A no-load cold end temperature of 73.4 K is achieved on PT08 when driven by thermoacoustic engine.