椭圆螺旋管道混合器混合效果模拟研究
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摘要
应用CFD技术研究了椭圆螺旋流道内两相液体在充分发展条件下的混合效果。基于FLUENT软件,对混合性能进行了数值模拟研究,讨论了椭圆螺旋管道混合器的截面形状、曲率半径、螺距3种因素对该混合器混合效果的影响。模拟所得液相的流动状态与实验结果具有很好的一致性。提取相应截面液体的混合不均匀系数,分析结果表明:截面形状的变化会给螺旋管道混合器造成不同程度的狭小区域,对混合均匀性影响较大;增加螺距会对混合产生消极的影响;当曲径为某一特征值时,混合效果可达到最好状态;同时,通过仿真分析得出,液体流速的改变对混合器中液体的混合效果影响不大;通过对流场内部剪切速率、流线、质点速度场的分析,讨论了粒子无序运动是螺旋混合器内液体充分混合的关键因素。
The two-phase mixing effect of spiral oval mixer was studied with the CFD technology when liquid in duct has insufficient natural flow. The mixing effects on the change of cross-sectional shape,radius of curvature and pitch of mixer were discussed and the cloud chart of the distribution phase was obtained based on the FLUENT software. The simulation results on the distribution of liquid have good adaptability with the experimental results.The data on the COV( Coefficient of variation) of liquid in relevant cross-sectional shape shows that there is a narrow area when the cross-sectional shape changes,producing a big impact to the mixing effect. There is a negative influence if the pitch of spiral oval duct increases; the mixing performance obtains its best state when the radius of curvature has a value. At the same time,simulation results show that the flow rate does not have important mixing effects on the liquid in the spiral oval duct mixer. Based on the previous research,the mixing process of different kinds of liquid in the spiral oval duct mixer was analyzed according to strain rate,the distribution of flow streamline and velocity field of a particle. The key factor of full mixing with the spiral oval duct mixer is that the distribution of particles is not in good order.
The two-phase mixing effect of spiral oval mixer was studied with the CFD technology when liquid in duct has insufficient natural flow. The mixing effects on the change of cross-sectional shape,radius of curvature and pitch of mixer were discussed and the cloud chart of the distribution phase was obtained based on the FLUENT software. The simulation results on the distribution of liquid have good adaptability with the experimental results.The data on the COV( Coefficient of variation) of liquid in relevant cross-sectional shape shows that there is a narrow area when the cross-sectional shape changes,producing a big impact to the mixing effect. There is a negative influence if the pitch of spiral oval duct increases; the mixing performance obtains its best state when the radius of curvature has a value. At the same time,simulation results show that the flow rate does not have important mixing effects on the liquid in the spiral oval duct mixer. Based on the previous research,the mixing process of different kinds of liquid in the spiral oval duct mixer was analyzed according to strain rate,the distribution of flow streamline and velocity field of a particle. The key factor of full mixing with the spiral oval duct mixer is that the distribution of particles is not in good order.
引文
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[14]董海宏.静态混合器数值模拟研究与结构优化[D].西安:西安建筑科技大学,2011Dong H H.Numerical simulation and optimization of static mixers[D].Xi'an:Xi'an University of Architecture and Technology,2011(in Chinese)
[15]王林翔,陈鹰,路甬祥.二次流实现流体混沌混合的数值研究[J].化工学报,1999,50(4):449-455Wang L X,Chen Y,Lu Y X.Numerical study on chaotic mixing caused by secondary flow[J].Journal of Chemical Industry and Engineering(China),1999,50(4):449-455(in Chinese)
[2]章本照,印建安,苏霄燕,等.旋转椭圆截面螺旋管道内的二次流[J].化工学报,2002,53(10):997-1002Zhang B Z,Yin J A,Su X Y,et al.Secondary flow in rotating helical elliptical pipe[J].Journal of Chemical Industry and Engineering(China),2002,53(10):997-1002(in Chinese)
[3]周毅,闫光辉.基于FLUENT的混合弯管流场的数值模拟[J].机械设计与制造,2011,(9):211-213Zhou Y,Yan G H.Numerical simulation for flow field of mixed elbow based on fluent[J].Machinery Design&Manufacture,2011,(9):211-213(in Chinese)
[4]席光,尚虹,王尚锦.90°强曲率弯管内三维湍流流场的数值分析[J].航空动力学报,1992,7(3):223-225Xi G,Shang H,Wang S J.Numerical analysis of 3-D turbulent flows in 90°bends[J].Journal of Aerospace Power,1992,7(3):223-225(in Chinese)
[5]Ohtake Y,Belyaev A,Alexa M,et al.Multi-level partition of unity implicits[C]//Proceedings of ACM SIGGRAPH.New York,NY,USA:ACM,2005:173
[6]Taylor A M K P,Whitelaw J H,Yianneskis M.Curved ducts with strong secondary motion:velocity measurements of developing laminar and turbulent flow[J].Journal of Fluids Engineering,1982,104(3):350-359
[7]Dean W R.XVI.Note on the motion of a fluid in a curved pipe[J].The London,Edinburgh,and Dublin Philosophical Magazine and Journal of Science,1927,4(20):208-233
[8]Bara B M.Experimental investigation of developing and fully developed flow in a curved duct of square cross section[D].Edmonton:University of Alberta,1991
[9]胡志伟,李勤凌,苗永淼.三维强弯管内湍流场的数值分析[J].西安交通大学学报,1998,32(1):49-52Hu Z W,Li Q L,Miao Y M.Numerical analysis of the three-dimensional turbulent flow field in a strong curved duct[J].Journal of Xi'an Jiaotong University,1998,32(1):49-52(in Chinese)
[10]赵立新,华正荣,关凤珠,等.螺旋管分离器流场分布及影响规律分析[J].化工机械,2010,37(5):592-595,649Zhao L X,Hua Z R,Guan F Z,et al.Flow field distribution and influence analysis of spiral tube separators[J].Chemical Engineering&Machinery,2010,37(5):592-595,649(in Chinese)
[11]于兴军,刘春全,艾志久,等.新型油水分离器分离性能研究[J].石油矿场机械,2006,35(3):31-33Yu X J,Liu C Q,Ai Z J,et al.Study on oil-water separation performance of a new device[J].Oil Field Equipment,2006,35(3):31-33(in Chinese)
[12]贺会群,李大桥,于兴军,等.螺旋式油水分离装置分离行为仿真研究[J].石油机械,2005,33(11):1-3He H Q,Li D Q,Yu X J,et al.Simulation of separation of oil-water mixture by helical oil-water hydrocyclone[J].China Petroleum Machinery,2005,33(11):1-3(in Chinese)
[13]郑勐,雷鹏,董永亨.一种高粘度两相流静态混合器混合均匀度的仿真分析[J].机械科学与技术,2014,33(10):1536-1539Zheng M,Lei P,Dong Y H.Simulation analysis on the mixing uniformity for a static mixer used for high viscous two-phase fluid[J].Mechanical Science and Technology for Aerospace Engineering,2014,33(10):1536-1539(in Chinese)
[14]董海宏.静态混合器数值模拟研究与结构优化[D].西安:西安建筑科技大学,2011Dong H H.Numerical simulation and optimization of static mixers[D].Xi'an:Xi'an University of Architecture and Technology,2011(in Chinese)
[15]王林翔,陈鹰,路甬祥.二次流实现流体混沌混合的数值研究[J].化工学报,1999,50(4):449-455Wang L X,Chen Y,Lu Y X.Numerical study on chaotic mixing caused by secondary flow[J].Journal of Chemical Industry and Engineering(China),1999,50(4):449-455(in Chinese)