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Description
In a pulse tube refrigerator, the multi-bypass structure establishes a gas channel in the radial direction between the pulse tube and the regenerator. In the experiment, it was observed that the flow area of the gas channel had a significant impact on the performance of the pulse tube refrigerator and that there exists an optimal flow area that drives the cold head to reach the minimum temperature. The finite volume method was adopted to solve the flow field in the pulse tube refrigerator with a multi-bypass structure. Meanwhile, the thermodynamic states of several gas parcels were also tracked in the Lagrange view. It is demonstrated that when the multi-bypass structure has a suitable flow area, some vortex cores would be generated in the pulse tube. Furthermore, the influence of the multi-bypass structure is explained with the vortex viewpoint on the pulse tube refrigerator.
