考虑空气柱的水力旋流器内流场的数值模拟

NUMERICAL SIMULATION FOR FLOW FIELD WITH AIR CORE IN HYDROCYCLONE

对水力旋流器内流场进行了数值模拟。旋流器内液相和气相的湍流模拟采用了雷诺应力模型(RSM),边界条件采用速度进口、压力出口。在同一工况下选用三维模型及二维简化模型、分别用VOF模型及刚盖法对空气柱进行处理,就空气柱形成、切向及轴向速度与相同条件下试验测量的结果进行比较。结果表明,三维模型计算结果较二维简化模型与实验值吻合得更好,但二维简化模型在降低精度不大的前提下大大减少了计算时间。对空气柱的处理,选用VOF模型得到的结果更准确,而刚盖法减少了计算用时。

Flow field in hydrocyclone is numerically simulated The turbulent flow of gas and liquid is modeled using the Reynolds Stress Model（RSM）, and the boundary condition of inlet is velocity-in and tile boundary condition of outlet is pressure outlet. For a 3-D model and a 2-D simplified model, the interface between the liquid and air core is modeled using both the Volume of Fluid multiphase model（VOF model} and the approximative method of wall assumption. It＇s shown that the results is more accurate by using 3-D model and VOF model, whereas using 2-D simplified model and approximative method of wall assumption could save the computes＇ resource.