【摘要】 进行了氦氮二元混合工质在单级脉管制冷机中的实验研究。实验结果表明 ,氮组分在 3%～ 2 5 %范围内的氦氮混合工质都可以提高脉管制冷机的制冷性能 ,实验中观察到了氦氮混合工质在制冷过程中存在气 液相变和液 固相变温度 ,并得到氮组分在其三相点附近的温度平台。更多还原

【Abstract】 An experiment investigation on two component multi phase helium and nitrogen mixtures in a single stage GM type pulse tube refrigerator was carried out The experimental results show that both the coefficient of performance( COP )and cooling power can be improved to some extent at above 70 K when the nitrogen fractions in the mixture is less than 25% A nearly stable temperature platform at the triple point 63 15 K of nitrogen,which is independent of the nitrogen fraction(25% nitrogen),was obtained when the cooling power is below 7W更多还原