通过有效体积转化进行分离器尺寸设计，针对高气液比工况设计了一种二级旋流气液分离装置，基于液滴在旋流场中的破碎特性及Navier?Stocks方程的简化求解建立一种分离器直径的校核方法，通过实验验证了该校核方法有效. 通过CFD方法对简化的分离装置内部流场的非对称性进行分析. 结果表明，旋转流场的不稳定程度随入口面积和升气管直径减小而减小，入口速度不影响流场的不稳定程度，不同的长宽比在相同的入口面积下对内部流场的非轴对称性无显著影响，但单独增加入口的长、宽或二者同时增加使入口面积增大，将使分离器筒体横截面与入口截面的面积比KA减小，增加内部流场的非轴对称性.
The undersea separation was widely used in the petroleum industry to improve the efficiency and keep the well pressure. High gas?liquid ratio condition exists in offshore gas field frequently and for this condition, a novel two-stage gas and liquid cylindrical cyclone was designed. In order to increase the separation efficiency, some parts had been added in the separator. The size parameters of the separator were designed by using effective volume transformation methods, and a method for diameter determination was also proposed based on the characteristics of liquid drop breaking in swirl field. This determination described the liquid drop’s changing shape and breaking in the gas cyclone field and the critical relative velocity of the gas phase and liquid phase when the liquid drops started to break had also been calculated. The model based on the pressure field by the solution of Navier?Stocks equation and had also been verified by the experiments which had measured the liquid drops diameters by using Malvern laser particle size analyzer and the data from model and experiments kept high consistency. Different turbulence models, different meshing schemes and different discrete formats had been compared in order to choose the best numerical simulation plan and this plan also had been validated by existing experimental data. The characteristics of asymmetry were analyzed by CFD about the internal flow field of the simplified model and the influence of structural parameters and operational parameters were also obtained. The results of the models showed that it was very diffcult for oil drops in different diameters to break in the gas cyclone fields. The results of the numerical simulation showed that the length of the separator had little effect on the asymmetry characteristics of the internal flow field and the inlet velocity and the ratio of the length and width of inlet would not make the internal flow field become unstable.
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