叶片结构对轴流导叶式旋风分离器性能的影响分析

Analysis of Effect of the Blade Structure on Performance of an Axial Guide Vane Cyclone Separator

为研究叶片结构对旋风分离器气液分离性能的影响规律,将气相作为连续介质,将液滴作为离散体系,采用Rosin-Rammler分布模型,考虑颗粒与壁面的碰撞,采用雷诺应力模型对旋风分离器内的流场进行数值模拟研究,同时进行试验验证。结果表明:分离器内柱筒和锥筒接合区段的外旋流具有很高的切向速度,是分离器的高压区,排气管入口前后切向速度很低,形成一个低压区,是压降产生的主要区段;叶片高度的增加使分离效率下降,同时压降平稳减小;叶片圈数增大使分离效率总体增大,但压降也相应增大;当叶片高度在40~45 mm之间,叶片圈数为0.25~0.30之间时,旋风分离器的分离效率接近最高,同时压降也比较低。

In order to study the effects of the blade structure on the performance of gas-liquid separation in the cyclone separator,the gas phase was treated as continuum,the liquid particles treated as discrete system,and Rosin-Rammler distribution model was used.The flow field of the cyclone separator was numerically simulated with Reynolds Stress Model,considering collision between the particles and the wall.Experiments were also conducted to validate the simulation model.Results show that the external swirling flow has a very high tangential velocity of the joint section of column barrel and conical barrel,which is the high pressure area,whereas the tangential velocity before and after the inlet of exhaust pipe is very low,thus forming a low pressure area,which is the main section where pressure drop occurs.Increase of blade height makes separation efficiency reduced,meanwhile the pressure drop decreases stably;Increase of blade cycle makes the overall separation efficiency increased,but the pressure drop increases accordingly;When the blade height is set to 40~45 mm and the blade cycle is set to 0.25~0.30,the separation efficiency of the cyclone separator is the highest and the pressure drop is relatively low.