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基于两相流理论,采用标准湍流模型和离散相模型,建立凝汽器补水雾化两相流动的物理数学模型,利用CFD计算软件进行了相应的数值计算。对影响喷雾凝结换热效果的主要因素,如喷雾压力、喷嘴孔径、喷雾方式、排汽流速、喷嘴布置方式等进行了详细分析。由计算结果可知:随着排汽流速的增加,蒸汽凝结量减少,出口水滴平均温度升高;喷雾压力,喷嘴孔径及喷雾方向对换热效果具有综合作用,最佳的补水雾化系统需要进行综合技术比较才能确定。
Based on the two-phase flow theory, a standard turbulence model and a discrete phase model are used to establish the physical-mathematic model of water-atomizing two-phase flow in the condenser. The numerical calculation is carried out by CFD software. The main factors influencing spray condensation heat transfer, such as spray pressure, nozzle aperture, spray mode, exhaust flow rate and nozzle arrangement, were analyzed in detail. From the calculation results, it can be seen that as the steam velocity increases, the amount of steam condensation decreases and the average temperature of the outlet drops increases. The spray pressure, the nozzle diameter and the spray direction have an integrated effect on the heat transfer effect. The optimal water atomizing system needs to be carried out Comprehensive technology comparison can be determined.