Study On Phase Shift Mechanism And DC-flow Of The Pulse Tube Cooler

Pulse tube cooler has received lots of attentions in recent yeas due to its simple structure, no moving parts in the cold space, reliable operation, low vibrations, long lifetime, and low cost. However, compared with traditional Stirling and G-M cryocoolers, the performance of pulse tube cooler remains to be improved. Therefore how to improve the performance is crucial to its wide application. To begin with, the thesis gives a brief review on historical development of the pulse tube cooler and study orientation of DC-flow problems in pulse tube cooler. Then, the thesis includes two parts. The first part advances, based on fluid network theory, a novel type coupled double-inlet and inertance tube called hybrid pulse tube cooler without reservoir after further concrete analysis on the phase shift mechanism of pulse tube cooler's structure. Discussion on the optimization of relevant system parameter is also carried out according to the fluid network theory. Taking the basic pulse tube cooler for example, the thesis calculates optimal diameter of the regenerator and value of the optimal work frequency by processing the program, which provides a new idea for how to further improve the working structure of the pulse tube cooler. The second part gives, from the numerical simulation point, a quantitative study of the DC-flow of double-inlet pulse tube cooler is made by the Fluent Software. The influence of properties of the working gas on the DC-flow is also analyzed to help further put forward effective DC-flow suppression measures and improve the performance of the pulse tube cooler.