基于两相CFD方法的竖直圆管环状流预测研究

Prediction of Annular Flow in Vertical Round Tube Based on Two-Phase CFD Approach

基于欧拉-拉格朗日方法,结合壁面液膜模型,模拟圆管环状流中的液滴与连续气相的相互作用、液滴在壁面处的沉积与夹带、液膜的沸腾与蒸发等关键物理现象。通过与瑞典皇家理工学院的环状流实验结果比较,评价欧拉-拉格朗日方法对环状流的预测精度。比较结果表明,数值模拟得到的液膜质量流量与实验测量结果吻合良好,证明所采用欧拉-拉格朗日方法及本构模型能够较准确地模拟环状流动。

Based on the Euler-Lagrangian method and the liquid film model, the phase interaction phenomena, including the interaction between the liquid drop and continuous gas, liquid drop deposition and entrainment on the wall and the liquid film boiling and evaporation, are modelled for the annular flow in a round tube. The prediction accuracy of the Euler-Lagrangian method for the annular flow is evaluated by comparing the results of the annular flow experiment of KTH. The comparison results show that the mass flow rate of the liquid film obtained with numerical simulation agrees well with the experimental results. The results also verify that the Euler-Lagrangian method, accompanied with the applied flow and heat transfer model, can reasonably simulate the annular flow.