气液旋流分离器进口宽高比优化的数值模拟  

Numerical Simulation on Optimization of the Inlet Aspect Ratio in a Gas-Liquid Cyclone Separator

作　　者：周云龙[1] 米列东[1] 

机构地区：[1]东北电力大学能源与动力工程学院,吉林吉林132012

出　　处：《过程工程学报》2013年第5期754-759,共6页The Chinese Journal of Process Engineering

摘　　要：利用FLUENT提供的RSM和DPM模型对不同入口高度和宽度的气液旋流分离器进行了数值模拟.结果显示,当增大宽度或高度时切向速度与分离效率减小,但压降降低;当宽度大于环形空间的间隙时,部分进气流量直接作用于排气管上,影响内部流场;减小入口宽度或高度时引起的压降无明显差别,但减小宽度可提高分离效率而高度则相反.入口高度(a)与分离器筒体直径(D)的比值a/D和宽度(b)与分离器筒体直径(D)的比值b/D约为0.2时,压降基本相同,但分离效率相差约3.6%.a/D约为0.38时,分离效率约为95.6%,压降约为340 Pa;而b/D约为0.25时效率为96.3%,压降约为320 Pa,入口宽度对分离器性能的影响比入口高度更显著.The effects of inlet dimensions of a gas-liquid cyclone on its performance and flow field were investigated using the RSM and DPM models. The results show that the maximum tangential velocity in the cyclone increases with decreasing of the inlet dimensions, but the pressure drop is lowered. When the inlet width is wider than the gap between the cyclone barrel and vortex finder wall, part of the incoming flow will impact the vortex finder and affect the flow field. When the inlet width or height decreases, the pressure drop has no significant change. When the width is reduced, the separation efficiency of cyclone can be improved, but the height is the opposite. When the ratios of inlet height and width to cyclone diameter, a/D and b/D, are 0.20, both dimensions lead to the close pressure drop, but the separation efficiency has a difference of 3.6%. When a/D is 0.38, the separation efficiency is 95.6%, and the pressure drop 340 Pa. When b/D is 0.25, the separation efficiency is 96.3%, and the pressure drop 320 Pa. The effect of inlet width is more significant than that of inlet height, especially for the separation efficiency of cyclone.

关 键 词：气液旋风分离器 数值模拟 进气口尺寸 分离效率 流场 

分 类 号：O359.1[理学—流体力学]