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汽水分离装置是蒸汽发生器中非常重要的部件,作用是去除蒸汽流中夹带的小液滴,为汽轮机提供品质合格的饱和蒸汽,其性能对核电站运行的安全性和经济性有着十分重要的影响。液滴在汽水分离装置中的运动过程中,阻力和结构的变化会造成压力降低,打破汽液相平衡,造成液滴的蒸发,进而影响汽水分离性能。该文从压力变化条件下静止液滴的物理现象描述和机理解释出发,建立了压力变化条件下静止液滴相变的水动力学—动力学模型,通过了时间步长的网格无关性验证,与实验结果吻合良好,相对误差在±5%以内。该模型可以为进一步研究汽水分离装置中的液滴运动相变过程和改进汽水分离性能提供理论依据。
Soda water separator is a very important part of the steam generator, the role is to remove small droplets entrained in the steam flow, the steam turbine to provide qualified quality of saturated steam, the performance of nuclear power plant operation of the safety and economy have a very important impact . During the movement of the droplet in the soda separator, the resistance and structural changes will cause the pressure to drop, break the vapor-liquid phase equilibrium, cause the droplet to evaporate, and further affect the soda separation performance. Based on the description of the physical phenomena and the mechanism of the stationary droplets under the condition of the pressure changes, a hydrodynamic-kinetic model of the stationary droplets’ phase transition under the pressure changes was established. The time-independent grid-independent verification , Which is in good agreement with the experimental results and the relative error is within ± 5%. The model can provide a theoretical basis for further study of the droplet phase transition in the separator and the improvement of the separation performance.