摘要
建立基于拉格朗日-欧拉方法的气-液两相流动的数学模型,利用商用计算流体力学软件CFX对该模型求解,数值模拟几何缩比后AP1000旋叶式汽-水分离装置内部冷态工况下气-液两相流动特性。模型中空气为连续相,其内运动的液滴视作离散相,针对液滴在流场中的运动特点,考虑液滴受到曳力、虚拟质量力、浮力和重力,并以此建立空气和液滴动量双向耦合的动力学模型。针对9个不同工况,利用CFX软件对两相流模型进行求解,得到不同直径大小的液滴在流场内的运动轨迹,进而得到分离器的分离效率和进出口总压降。结果显示:分离效率的计算值与冷态实验数据非常吻合,且压降计算值与冷态实验值变化趋势基本一致,验证所建立模型的正确性。
A mathematical model of gas-liquid two phase flow is built based on Eulerian-Lagrangian method, and this model is solved by the commercial CFD software CFX to simulate the flow characteristics in an AP1000 swirl-vane moisture separator in a special compression rate under cold condition. In this model, gas is supposed to be the continuous phase and water droplets moving in the separator are thought to be the dispersed phase. According to the motion characteristics of droplets in the flow field, we consider the droplet is controlled by the drag force, virtual mass force, buoyance force and gravity force, and in consequence build the momentum two-way coupling dynamic model of gas and droplets. Aiming at 9 working conditions, we used CFX software to solve this two phase flow model to get the trajectories of droplets with different diameters, in addition to obtain the separation efficiency and total pressure drop between inlet and outlet of the separator. The results show that the computed separation efficiency agrees well with the cold condition experimental data, and the changing trend of the calculated pressure drop is the same as the experimental value, which reveals the correction of our model.
出处
《核动力工程》
EI
CAS
CSCD
北大核心
2015年第5期75-79,共5页
Nuclear Power Engineering
基金
国家自然科学基金(51206092)
关键词
液滴
AP1000
分离效率
压降
Droplet, AP 1000, Separation efficiency, Pressure drop
