NUMERICAL SIMULATION OF A THREE-STAGE STIRLING-TYPE PULSE TUBE CRYOCOOLER FOR 4K OPERATION
NUMERICAL SIMULATION OF A THREE-STAGE STIRLING-TYPE PULSE TUBE CRYOCOOLER FOR 4K OPERATION
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DOI：
10.1063/1.2908518
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发表时间：
2008-03
期刊：
影响因子：
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通讯作者：
J. Y. Hu;W. Dai;E. Luo;Zhongbin Wu
中科院分区：
文献类型：
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作者：
J. Y. Hu;W. Dai;E. Luo;Zhongbin Wu
热声驱动的两级脉管制冷机最近在我们的实验室达到了约18.1K的最低温度，我们现在正在开发一种工作在约4K的三级斯特林型脉管制冷机，以匹配热声发动机。本文采用热声理论对三级脉管制冷机进行了数值模拟。为了降低第二、三级冷端的冷却功率损失，在第一、二级冷端上引入两个热桥，对第二、三级脉管进行冷却。因此，在冷端附近的脉冲管中的温度梯度减小，通过脉冲管的导热性的冷却功率损失也减小。经过数值优化，在输入声功率为207瓦时，脉管制冷机的制冷温度达到3.87K。
The thermoacoustically driven two-stage pulse tube cooler has recently reached a lowest temperature of about 18.1K in our lab, and we are now developing a three-stage Stirling-type pulse tube cooler working at about 4K to match the thermoacoustic engine. In this paper, thermoacoustic theory is employed to simulate the three-stage pulse tube cooler. In order to decrease the cooling power losses of the second and third stage cold tips, two thermal bridges are introduced on the first and second stage cold tips to cool down the second and the third stage pulse tubes. Thus, the temperature gradients in the pulse tubes near the cold tips decrease, so do the cooling power losses through the thermal conductivity of the pulse tubes. After numerical optimization, the pulse tube cooler reaches a cooling temperature of 3.87K with 207 Watts of input acoustic power.