不同流量条件下导叶式旋流器内部流动的数值模拟

Numerical Simulation of the Internal Flow of the Vane-Guided Hydrocyclones Under Different Flow Rates

应用Fluent软件和雷诺应力模型(RSM)对导叶式旋流器内部三维强旋湍流流动进行了数值模拟,考察了不同入口流量对旋流器内速度场的影响。研究结果表明,旋流器内径向速度远小于切向速度和轴向速度,锥段的切向速度明显小于柱段的切向速度;随着流量的增加,各向速度均增加,最大切向速度的分布直径并不随流量的变化而改变,且最大切向速度位于准自由涡与准强制涡的分界处。通过计算还发现,在旋流器圆柱段存在循环流和短路流,锥段的上行区域均小于柱段,而且截面越靠底流口,上行区域越小。

A numerical simulation was made of the internal three-dimensional strong rotary turbulent in a vane-guided hydrocyclone using Fluent software and Reynolds stress model（RSM） , the influence of different flow rates at the inlet on the velocity field in the hydrocyclone was studied. The research result shows that the radial velocity was far less than the tangential velocity and axial velocity in the hydrocyclone, and the tangential velocity in the cone section was evidently less than the tangential velocity in the circular column section. With the increase of flow rates, the velocities in every direction was increased. The distribution diameter of the maximum tangential velocity did not vary with the change of the flow rates, and the maximum tangential velocity was located at the demarcation between the quasi-free vortex and the quasi-forced vortex. Through calculations, it was found that there was the circular flow and short-circuit flow in the cylinder, the up-bound area in the cone section was commonly smaller than that in the circular column section, and when the cross section was near the underflow hole, the up-bound area was small.