RSM与LES模拟旋风分离器流场动态特性的对比分析  

Comparative Analysis of Flow Field Dynamic Characteristics of Cyclone Separators by RSM and LES Simulation

作　　者：孙立强[1,2] 胡月 王迪 宋健斐[1,2] 魏耀东 Sun Liqiang;Hu Yue;Wang Di;Song Jianfei;Wei Yaodong(State Key Laboratory of Heavy Oil Processing,China University of Petroleum,Beijing 102249,China;Beijing Key Laboratory of Process Fluid Filtration & Separation,Beijing 102249,China;Faulty of Engineering,China University of Petroleum-Beijing at Karamay,Karamay 834000,China)

机构地区：[1]中国石油大学(北京)重质油国家重点实验室,北京102249 [2]过程流体过滤与分离技术北京重点实验室,北京102249 [3]中国石油大学(北京)克拉玛依校区工学院,新疆克拉玛依834000

出　　处：《化学反应工程与工艺》2018年第4期289-296,共8页Chemical Reaction Engineering and Technology

基　　金：国家自然科学基金(21776305;21566038);中国石油大学(北京)克拉玛依校区科研启动基金(RCYJ2016B-02-002)

摘　　要：为评价雷诺应力模型(RSM)与大涡模拟(LES)两种方法计算旋风分离器动态流场的精度,利用FLUENT14对旋风分离器内气相动态流场特性进行数值模拟及分析,考察了两种方法计算得到的瞬时切向速度分布、切向速度脉动强度及切向速度频谱特性。计算结果与热线风速仪(HWA,Hot-wire anemometer)测量的切向速度数据进行无量纲对比表明,在时均切向速度上,LES的模拟结果比RSM的准确性高;在瞬时切向速度上,LES预测的瞬时切向速度可以反映旋流摆动造成的切向速度的波动特性,呈现出接近实验测量值的高频速度脉动变化;而RSM难以预测瞬时切向速度的波动变化,仅给出低频小幅值的波动。因此采用LES预测旋风分离器流场能够捕捉动态信息,揭示流场的动态特性。In order to evaluate the accuracy of Reynolds stress model(RSM) and Large eddy simulation (LES) in calculating the flow field of cyclone separator,the characteristics of gas phase dynamic flow field in the cyclone separator were numerically simulated and investigated by FLUENT14. The instantaneous tangential velocity distribution,the intensity of tangential velocity pulsation and the tangential velocity spectral characteristics were analyzed based on the calculated results. The dimensionless comparison between the calculated results and the tangential velocity data measured by the hot-wire anemometer (HWA, Hot-wire anemometer) showed that LES were more accurate than the RSM at the time-average tangential velocity. Furthermore,the instantaneous tangential velocity predicted by LES could give the fluctuation characteristics of tangential velocity caused by the swirling swing,and show the high frequency velocity variation pulsation close to the experimental measurement. However,RSM is difficult to predict the fluctuations of instantaneous tangential velocity,giving only fluctuations in low frequency and small amplitude. Therefore,the LES is used to predict the flow field of the cyclone separator to capture the dynamic information and reveal the dynamic characteristics of the flow field.

关 键 词：旋风分离器 流场计算 雷诺应力模型 大涡模拟 动态特性 

分 类 号：TQ051.8[化学工程]