实际逆布雷顿空气制冷循环的性能研究

Investigation on performance of actual reverse-brayton air cycle

对实际逆布雷顿循环空气制冷循环进行了热力学分析,对其循环性能进行了数值模拟研究。结果表明,影响实际循环性能的主要因素有膨胀比、转动部件等熵效率、工作温度等;实际循环中存在一最优膨胀比;制冷机用作空调冷源时,膨胀比在最优膨胀比附近;最优膨胀比的大小受压缩机效率、膨胀机效率、换热器端部温度等因素影响。

The thermodynamic analysis of the actual reverse - Brayton air cycle was performed and the performance was studied by numerical simulation. The results show that,the factors on the performance of the actual cycle include the sweUing ratio, the isentropic efficiencies of the rotors, working temperature and etc. ; there is an optimal swelling ratio for the actual cycle ; the refrigerator can be used for air conditioning near the optimal swelling ratio; the optimal swelling ratio is affected by the isentropic efficiencies of the rotors and the temperature of heat exchangers.