Acting mechanism of the complex DC-flow in the pulse tube refrigerator

In order to further explore the influence of the unsymmetrical characteristic of a pulse tube refrigerator on DC-Flow phenomena and the influence of the DC-Flow mass rate on cooling capacity, a numerical simulation method is carried out. A geometrical parameter, asymmetry ratio that acts as the token of the unsymmetrical characteristic of the pulse tube refrigerator, is brought forward. The influence of the unsymmetrical characteristic of the DC-flow and the cooling performance of the pulse tube refrigerator are studied in details. Based on the numerically simulated results, it is indirectly indicated that the thermodynamic unsymmetrical characteristic of the system is the main inducement that arouses the complex DC-Flow phenomena in the pulse tube refrigerator. On the other hand, in different conditions of the direction and magnitude of the DC-Flow, the influence of them on the wall mean temperature distribution in the regenerator and the pulse tube, which are key parts of the pulse tube refrigerator, is also studied in details. The results further validate the rationality of the measuring rule that the distribution curve of the wall temperature could qualitatively describe the direction and magnitude of the DC-Flow. When the nonlinearization of the distribution curve in the regenerator and the pulse tube is too severe, the magnitude of DC-Flow in the pulse tube refrigerator is also large and the influence on the cooling capacity is serious.