进口结构对方形旋风分离器性能影响的数值研究  

Numerical simulation of effect of inlet configuration on performance of square cyclone separator

作　　者：苏亚欣[1] 郑安桥[1] 杨翔翔 

机构地区：[1]东华大学环境学院,上海201620 [2]黎明大学校长办公室,福建泉州362000

出　　处：《热科学与技术》2009年第4期318-325,共8页Journal of Thermal Science and Technology

摘　　要：利用CFD模拟研究了一种具有双矩形进口的方形截面的旋风分离器内部的流动特点,其中气相模型采用了雷诺应力湍流模型(Reynolds stress model,RSM),颗粒相采用随机轨道模型。计算结果与文献实验数据的对比表明模型具有可靠性。模拟结果表明:在分离器内部的排气管和分离器壁面间的区域为强旋湍流区,靠近分离器壁面和排气管壁面的区域旋流强度较弱;排气管下的分离器内出现了回流;进口结构影响分离器内的旋流分布特点和回流开始位置及湍动能的分布,从而影响了分离效率和阻力,其中倾斜双进口的方形分离器内旋转向下的气流运动区域更大,回流开始位置更低,因此其分离效果更好;进口结构影响分离器内局部湍动能的分布特点和大小,从而决定了分离器的阻力大小;倾斜双进口的方形分离器内的局部湍动能小于对应的垂直单、双进口分离器,因此其阻力系数最小。A CFD numerical simulated model on the effect of inlet configuration on the pressure drop and separation efficiency of a square-type cyclone separator was presented. The Reynolds Stress Model （RSM） was used to simulate the turbulent flow of gas phase and a random trajectory model was applied to simulate the particle motion. The CFD results of the velocity, grade separation efficiency and pressure drop agreed well with the experimental data. The numerical results also show that the flow field in the cyclone includes a strong swirling region between the exhaust exit and the separating wall with a weak swirling region near the separator wall. There is a recirculation flow just beneath the gas exhaust tube. The inlet configuration influences the position where the recirculation flow begins and the swirling field in the separator, leading to different separation efficiency and pressure drop. Among the three models of the separator, the one with double inclined inlets has a higher separation efficiency. The numerical results show that the region of downward swirling flow is larger and the position of upward recirculation flow is lower in the separator with double inclined inlets. At the same time, the local turbulent kinetic energy is smaller than that in the separator with one and double perpendicular inlets, which leads to a smaller pressure drop for the separator with double inclined inlets.

关 键 词：方形旋风分离器 进口结构 数值模拟 

分 类 号：TK223.2[动力工程及工程热物理—动力机械及工程]