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高频脉冲管制冷机具有较高的能量密度和比功率,具有重要的发展前景。本文对采用纤维毡作为回热器填料的300 Hz两级脉冲管制冷机进行了数值模拟。首先优化了系统尺寸,考察了系统平均压力与制冷机入口压比对系统性能的影响;重点研究了不锈钢纤维毡的丝径和孔隙率对制冷机性能的影响,并且将最优尺寸下不锈钢丝网和纤维毡作为填料时对制冷机性能影响进行了对比。当制冷机入口压比为1.2时,纤维毡作为回热器填料的系统获得了26.4 K的无负荷冷头温度,相比丝网作为填料的系统下降了近10 K,此时不锈钢纤维毡丝径为8μm,孔隙率为85%。
High-frequency pulse tube refrigerator has a high energy density and specific power, has important prospects for development. In this paper, a 300 Hz two-stage pulse tube refrigerator with fiber mat as regenerator was numerically simulated. Firstly, the system size was optimized and the influence of system average pressure and inlet pressure ratio of the refrigerator on the system performance was investigated. The influence of the wire diameter and porosity of the stainless steel fiber mat on the performance of the refrigerator was studied emphatically. The optimal size of the stainless steel wire Net and fiber mat as filler when the performance of the refrigerator were compared. When the inlet pressure ratio of the refrigerator is 1.2, the system of fiber mat as regenerator packing achieves a non-load cold head temperature of 26.4 K, which is nearly 10 K lower than that of the screen as filler. At this time, the stainless steel fiber felt The diameter is 8 μm and the porosity is 85%.