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本文对液氦温区Vuilleumier耦合脉冲管(VM-PT)制冷机进行了数值计算研究。为了减小来自室温的漏热,将气库置于一级冷头之上。采用SAGE软件建立了数值计算模型,以无负荷制冷温度为目标函数对制冷机运行参数进行了优化。为了进一步了解制冷机的工作原理,研究了脉冲管制冷机内焓流、声功、熵流、压力波、体积流率及温度的沿程分布,并对其相位关系和可用能损失进行了分析。计算结果表明,该制冷机可在平均压力0.9 MPa、压比1.61、运行频率0.8Hz时得到3.69 K的无负荷制冷温度,在4.2 K时可提供16.24 mW制冷量。
In this paper, the numerical calculation of Vuilleumier coupled pulse tube (VM-PT) refrigerator with liquid helium temperature is studied. In order to reduce the leakage from room temperature, the gas tank is placed above the primary cold head. The numerical calculation model was established by SAGE software, and the operating parameters of the refrigerator were optimized with the objective of no-load refrigeration temperature. In order to further understand the working principle of the refrigerator, the distribution of enthalpy flow, acoustical work, entropy flow, pressure wave, volume flow rate and temperature along the pulse tube refrigerator were studied. The phase relation and available energy loss were analyzed . The calculation results show that the refrigerator can achieve 3.69 K no-load refrigeration temperature at an average pressure of 0.9 MPa, a pressure ratio of 1.61 and an operating frequency of 0.8 Hz, and provides a cooling capacity of 16.24 mW at 4.2 K.