为研究非共沸混合工质在螺旋折流板换热器（HBHX）中的传热机理和热力参数对冷凝传热系数的影响，建立HBHX冷凝分布参数模型（DPM），并进行乙烯、丙烷和异戊烷混合工质冷凝实验，利用实验结果验证模型的正确性。结果表明：冷凝过程中混合工质沿程分别经历剪切力控制区、过渡区和重力控制区，受气相热阻和液相热阻共同影响，冷凝传热系数随干度的减小先增大后减小，在干度0.72处达到最小值；质量流速对冷凝传热系数的影响在剪切力控制区和过渡区大于重力控制区；随混合工质轻组分的增加在剪切力控制区和过渡区冷凝传热系数减小，在重力控制区冷凝传热系数增加。

In order to study the heat transfer mechanism of nonazeotropic mixture refrigerant in the helical baffle heat exchanger (HBHX) and the influence of thermodynamic parameters on the condensation heat transfer coefficients,the condensation distributed parameter model (DPM) of HBHX was is established,the condensation experiments were conducted about mixture refrigerants of ethylene,propane and isopentane,and the correctness of the model was verified by the experimental results.The research results show that the mixture refrigerants undergo shear force control zone,transition zone and gravity control zone along the route respectively during the condensation process.The condensation heat transfer coefficient increases firstly and then decreases with the reduction of dryness and reaches the minimum value at the dryness of 0.72,which is affected by the gasphase and liquidphase thermal resistances jointly.The influence of mass flow rate on the condensation heat transfer coefficient is greater in the shear force control zone and the transition zone than in the gravity control zone.With the increase of the light component ratios of the mixture refrigerants,the condensation heat transfer coefficient decreases in the shear force control zone and the transition zone and increases in the gravity control zone.

TK124;TK172

安徽省科技重大专项（202003a05020025）；合肥通用机械研究院有限公司青年科技基金项目（2019010368）