Abstract
New phenomena discovered in the experimental research of the ultra-high frequency pulse tube cryocooler were presented. The cause of the new phenomena was analyzed and the third type DC flow was discovered in the pulse tube cryocooler. The third type DC flow not only deteriorated cooling capacity but also led to temperature instability of the pulse tube cryocooler. From the fluid network theory and the simple regenerator model, the root of the third type DC flow was concisely investigated in theory. The asymmetric resistance of oscillating flow in pulse tube cryocooler was the key mechanism of the third type DC flow. Some suppression methods were briefly discussed.
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