DSM重介质旋流器流场的数值模拟

采用计算流体力学软件，选用RSM湍流数值计算模型，对DSM型重介质旋流器的流场进行了数值模拟.研究了DSM型重介质旋流器流场的速度分布、密度分布和压力分布，得出4点结论：旋流器内的流体沿着溢流管的外侧向下流动，使旋流器分选时存在短路流，降低了旋流器的分选效率.旋流器内的轴向速度越接近中心越高，大约在旋流器半径的中部通过零点，所有速度为零的个点形成了零轴速包络面（LZVV.旋流器内的切向速度从内向外逐渐升高，在空气柱附近达到最大值，然后逐步下降到最低点.由于回流的作用，在旋流器中间造成负压区形成了空气柱，空气柱截面直径大约为溢流口直径的0.6倍.

Numerical simulation of flow field in the DSM heavy medium cyclone

The numerical simulation was made to the flow field in the DSM heavy medium cyclone by using the software of CFD(computational fluid dynamics) and RSM(Reynolds Stress Model) of the turbulent flow.What's more,the velocity distribution,density distribution and pressure distribution of the flow field in the DSM heavy medium cyclone were studied as well,thus following four conclusions were reached: the fluid in the cyclone flows downwards along outside of the overflow pipe,and shirt-circuit flow occurs during the separation,thus reducing the separation efficiency of the cyclone.The axial velocity in the cyclone becomes quicker to the centre and goes through the zero point approximately in the middle of radius of the cyclone,thus all the points where velocities are zero form the zero-axial velocity envelope plane(LZVV).The tangential velocity in the cyclone improves gradually from inside to outside and reaches the maximum close to the air column and then reduces step by step until to the minimum.Due to effect of the return flow,a negative pressure zone forms in the middle of the cyclone and the air column whose sectional diameter is about 0.6 times of the diameter of the overflow outlet occurs here.