螺旋式旋流器的径向速度分析

Analyse on Radial Velocity in a Spiral Cyclone

借助CFD软件,采用RSM模型对螺旋式旋流器内的径向速度场进行了数值模拟。模拟结果表明:在外围区域,流体的径向速度的大小是先增加后减小,而速度方向在一个螺距内的两个半程是相反的;在内部强制涡旋区域,径向速度的方向是由外向内,但在不同高度上,分布也不相同。另外局部区域存在对分离有很大的影响的二次涡流。以上的这些流场特性对进一步充分认识此类旋流器的分离机理提供了一些依据。

The internal radial velocity field in a spiral cyclone was simulated with commercial CFD software and the Reynolds Stress Model（RSM）. The simulated results indicate that in the external vortex, the radical velocity increased at the beginning, then decreased;but the direction of velocity in a pitch＇s two half range is opposite. In the inner vortex, the direction of radial velocity was from outside to inside, but at the different height, the distribution of the radial velocity was different. Furthermore, the secondary vortex exist in partial area has great influnce on separation. The characteristics of these flow field mentioned above provided the evidence for new understanding of a spiral cyclone separation mechanism.