先排矸三产品重介质旋流器流场的数值模拟

Numerical simulation of flow field of the three-product heavy medium cyclone with refuse disposal first

使用3种湍流模型对先排矸三产品重介质旋流器的流场进行了数值模拟和实验研究.采用RSM模型进行的流场数值模拟结果表明,在旋流器密度场中,一段旋流器流场中存在着完整的空气柱,二段空气柱是气水混合中心低密度区;在旋流器压力场中,以轴线为中心存在着负压区,沿径向负压逐渐升高至0,然后达到正压力;在旋流器速度场中,轴向速度沿轴线向下形成内旋流,沿半径加大到0,形成了零速包络面,一段的切向速度和DWP旋流器相近,二段的切向速度比DWP旋流器更高.

The numerical simulati heavy medium cyclone with refuse on and experimental research were made to the flow field of the three-product disposal first through using three kinds of turbulent flow models. The results obtained from the numerical simulation of the flow field made with the RSM model show that, in the density field of the cyclone, there exists a complete air column in the first stage of the cyclone and the air column in the second stage of the cyclone is a central low-density area blended of gas and water. Meanwhile, in the pressure field of the cyclone, a negative pressure zone forms in the middle of the cyclone and then this negative pressure improves gradually to the zero point of the pressure along radial direction and later reaches positive pressure values. What＇ s more, in the velocity field of the cyclone, the axial velocity becomes quicker in the centre and goes to the zero point along the radius of the cyclone, thus all the points where velocities are zero form a zero-axial velocity envelope plane, the tangential velocity in the first-stage of the cyclone is close to that of the DWP cyclone and the tangential velocity in the second-stage is higher than that of the DWP cyclone.