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为了深入研究逆布雷顿空气制冷机的降温特性与制冷性能,论文首先采用CFX数值模拟方法,对透平膨胀机冷端通流部分的流动与热力学过程进行了数值模拟,进一步对整机的热力性能进行了分析;在此基础上探讨了制动功率对膨胀机降温特性影响;并改进了逆布雷顿空气制冷机综合实验台,采用风机回路闭式循环,进行了定制动压力和定特性比两种典型制动策略下制冷机降温性能的实验研究。结果表明:通过调节风机闭式循环制动压力来匹配膨胀机工况的变化方案可行,理论预测与实验结果吻合较好;透平膨胀机的绝热效率62%,在120 min内制冷机最低无负荷出口温度达到了-170℃;采用透平膨胀机的逆布雷顿空气制冷机具有优异的制冷性能。
In order to further study the cooling characteristics and cooling performance of the reverse Brayton air refrigerator, the numerical simulation of CFX numerical simulation is used to simulate the flow and thermodynamics of the throughflow section of the turbine expander. On the basis of this, the influences of braking power on the cooling characteristics of expander are discussed. The experimental platform of inverse Breton air refrigerator is improved. The closed circuit of fan circuit is used to make the dynamic pressure and the fixed characteristic ratio Experimental Study on Cooling Performance of Chiller with Two Typical Braking Strategies. The results show that it is feasible to adjust the closed loop brake pressure of fan to match the change of working condition of expander. The theoretical predictions are in good agreement with the experimental results. The adiabatic efficiency of turbo expander is 62%, and the lowest in 120 min Load outlet temperature reached -170 ℃; Turbo expander using reverse Brayton air refrigerator with excellent cooling performance.