旋风分离器入口上侧收缩角对流场影响研究  

Influence of necking angle on upper side of the inlet on flow field of cyclone separator

作　　者：刘岗辉 王卫兵[1] 喻俊志[2] 韩帅 LIU Ganghui;WANG Weibing;YU Junzhi;HAN Shuai(College of Mechanical and Electrical Engineering,Shihezi University,Shihezi 832003,China;State Key Laboratory of Management and Control for Complex Systems,Institute of Automation,Chinese Academy of Sciences,Beijing 100190,China)

机构地区：[1]石河子大学机械电气工程学院,新疆石河子832003 [2]中国科学院自动化研究所复杂系统管理与控制国家重点实验室,北京100190

出　　处：《热力发电》2022年第4期173-178,共6页Thermal Power Generation

基　　金：国家自然科学基金项目(51264034)。

摘　　要：为了改善旋风分离器内部流场的不对称性并提高分离效率,提出在旋风分离器的入口上侧设置收缩角,并采用Fluent软件的雷诺应力模型(RSM)对入口上侧带收缩角的旋风分离器进行数值模拟。结果表明:设置入口上侧的收缩角,可使旋风分离器近壁面区域的静压明显增加,中心轴线上的静压波动减小,并且排尘口附近的负压值变大,有利于改善颗粒返混现象;入口收缩角使入口截面逐渐变小,入口气流逐渐加速,而压降大致与入口速度的平方成正比,导致压降升高;入口收缩角没有改变短路流发生的区域,积分截面都在排气管末端下方15 mm处,但是改进后的旋风分离器短路流量减少,切向速度变大,有利于颗粒分离。In order to improve the asymmetry of flow field and the separation efficiency of cyclone separator,a method to set necking angle on upper side of the inlet of the cyclone separator was proposed.The Reynolds stress model(RSM)provided by Fluent software was employed to simulate the cyclone separator with the necking angle on the upper side of the inlet.The results indicate that,the necking angle on upper side of the inlet makes the static pressure in the near wall area of the cyclone separator increase obviously,the static pressure fluctuation on the axis decrease gradually,and the negative pressure value near the dust exhaust port become larger,which is beneficial to improving the phenomenon of particle back-mixing.The inlet necking angle makes the inlet cross section gradually be smaller,so the inlet airflow gradually accelerates,and the pressure drop is roughly proportional to the square of the inlet velocity,resulting in a gradual increase in pressure drop.The inlet necking angle does not change the area where the short circuit flow occurs,and the integrated cross-section is 15 mm below the end of the vortex finder,but the improved cyclone separator has a reduced short circuit flow and a larger tangential velocity,which is conducive to particle separation.

关 键 词：旋风分离器 收缩角 短路流 压降 静压 切向速度 分离效率 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]