结构及操作参数对旋流器切向速度场的影响——液-液水力旋流器速度场研究之二

Effects of structural and operating parameters on tangent velocity field of hydrocyclone

利用多普勒激光测速仪，结合流体力学理论，试验分析了双锥体水力旋流器结构和操作参数对切向速度场的影响。试验分析表明，大锥段和小锥段切向速度分布规律基本相同，均由准自由涡和准强制涡构成，分界面半径ｒｍ没有变化；随着小锥角θ的增加，准自由涡区缩小，准强制涡区扩大，速度梯度增加会加大液滴的乳化程度；随入口流量增加，切向速度增大，经拟合得出大锥段和小锥段的最大切向速度均为入口流量的４９４倍；分流比加大，分界面半径基本不变，最大切向速度增加。指出合理选择小锥角θ，控制操作参数如入口流量Ｑｉ和分流比Ｆ，可得到较好的分离效果。

By means of Laser Doppler Velocimeter and on the basis of the theory of fluid mechanics, the effects of the structural and operating parameters of a doublecone type hydrocyclone on the tangent velocity field are investigated. Test and analysis show that, the distribution patterns of the tangent veloctiy fields in the big cone area and the small cone area, which are comprised of parafree vortex and paraforced vortex, are basically identical without a change of the radius of the boundary surface; with the increase of the angle of the small cone, the parafree vortex area decreases and the paraforced vortex area increases, and the emulsifiability of the fluid drips increases with the increase of velocity gradient; the tangent velocity increases with the increase of inlet flow, and the maximum tangent velocities of both the big cone area and the small cone area are 494 times of the inlet flow; and the maximum tangent velocity increases with the increase of the split ratio and with the radius of the b It is concluded that by selecting proper angle of the small cone and controlling operating parameters, such as flow and split ratio, good separation effect can be achieved.