基于数值模拟的分离鳃水沙分离效率及机理分析
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摘要
利用层流模型和欧拉模型,运用Phase Coupled SIMPLE(PC-SIMPLE)算法,对分离鳃与普通管中的水沙两相流流场进行了静水沉降的三维数值模拟,并根据数值计算结果,对分离鳃与普通管内的速度场和含沙量分布特性进行了对比与分析,探讨了分离鳃的水沙分离效率及机理。结果表明:分离鳃中的速度矢量分布规律与普通管不同;分离鳃的结构形式、其内部的流场特性及含沙量分布特性都有利于水沙的分离,故分离鳃中的泥沙速度、清水速度及泥沙去除率都大于普通管的。探明了分离鳃快速分离水沙的机理,这对分离鳃结构的进一步优化提供了理论基础。
Adopting laminar model and Eulerian multiphase flow model,three dimension numerical simulation of the two-phase flow field of water-sediment in gill-piece separation device and common tube are conducted by using phase coupled simple(PC-SIMPLE)algorithm.Based on the calculation results,the velocity field and the distribution characteristics of sediment concentration in gillpiece separation device and common tube are compared,and the water-sediment separation efficiency and mechanism are discussed.The results show that the velocity vectors distribution law in the gill-piece separation device is different from that in common tube;the structure type,the internal flow field characteristics and the sediment concentration distribution characteristics of gill-piece separation device are beneficial to the water-sediment separation.So the sediment velocity,the water velocity and the sediment removal rate in the gill-piece separation device is greater than those in the common tube.This paper has explored the mechanism of rapid water-sediment separation in gill-piece separation device.So it provides a theoretical basis for the further structure optimization.
Adopting laminar model and Eulerian multiphase flow model,three dimension numerical simulation of the two-phase flow field of water-sediment in gill-piece separation device and common tube are conducted by using phase coupled simple(PC-SIMPLE)algorithm.Based on the calculation results,the velocity field and the distribution characteristics of sediment concentration in gillpiece separation device and common tube are compared,and the water-sediment separation efficiency and mechanism are discussed.The results show that the velocity vectors distribution law in the gill-piece separation device is different from that in common tube;the structure type,the internal flow field characteristics and the sediment concentration distribution characteristics of gill-piece separation device are beneficial to the water-sediment separation.So the sediment velocity,the water velocity and the sediment removal rate in the gill-piece separation device is greater than those in the common tube.This paper has explored the mechanism of rapid water-sediment separation in gill-piece separation device.So it provides a theoretical basis for the further structure optimization.
引文
[1]杨海华,李琳,靳晟,等.梭锥管内泥沙沉降特性及运动轨迹研究[J].水力发电学报,2013,32(2):184-189.
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[11]Takacs I,Patry G,Nlasco D.A dynamic model of the clarification thickening process[J].Water Research,1991,25(10):1 263.
[12]陶洪飞,邱秀云,赵丽娜,等.水沙分离鳃内部流场数值模拟与验证[J].农业工程学报,2013,29(17):38-46.
[13]罗菲,邱秀云,李琳.单鳃片分离鳃固液两相流流场三维数值模拟[J].新疆农业大学学报,2011,34(3):253-258.
[14]谭义海,李琳,邱秀云,等.梭锥管混浊流体分离装置水沙分离影响因素优化试验研究[J].中国农村水利水电,2011,(5):50-52.
[15]李琳,邱秀云,龚守远,等.浑水水力分离清水装置内水沙两相[J].中国农村水利水电,2008,(1):11-15.
[16]王苗,李琳,杨海华,等.梭锥管与普通装置内水沙两相流场特性数值模拟[J].中国农村水利水电,2014,(1):111-117.
[17]田艳,张根广,秦子鹏.厢式沉沙池进口优化试验及流场三维数值模拟[J].中国农村水利水电,2013,(8):89-94.
[18]林刚毅,沈爱春,王跃奎,等.基于数值模拟的太湖流域地区节水条件下水田灌排水量研究[J].节水灌溉,2012,(1):11-14.
[2]邱秀云,龚守远,严跃成,等.一种新型水沙分离装置的研究[J].新疆农业大学学报,2007,30(1):68-70.
[3]朱超,邱秀云,刘艳.垂向异重流式水沙分离鳃鳃片型式对水沙分离的影响研究[J].新疆农业大学学报,2008,31(6):72-75.
[4]朱超,龚守华,邱秀云,等.垂向异重流式水沙分离鳃鳃片间距对水沙分离的影响研究[J].新疆农业大学学报,2009,32(2):78-81.
[5]赵丽娜,邱秀云,陈铂,等.两相流水沙分离鳃流场的PIV测试及分析[J].新疆农业大学学报,2012,35(2):144-148.
[6]吴春笃,张伟,黄勇强,等.新型旋流分离器内固液两相流的数值模拟[J].农业工程学报,2006,22(2):98-102.
[7]Krebs P,Armhruster M,Rodi W.Laboratory experiments of buoyancy-influenced flow in clarifiers[J].Journal of Hydraulic Research,1998,36(5):831.
[8]王文娥,王福军,牛文全,等.滴头流道结构对悬浮颗粒分布影响的数值分析[J].农业工程学报,2009,25(5):1-6.
[9]王文娥,王福军.片状迷宫滴头中悬浮颗粒浓度分布规律数值分析[J].农业工程学报,2007,23(3):1-6.
[10]Wang Li-yang,Zheng Zhi-chu,Wu Ying-xiang,et al.Numerical and experimental study on liquid-solid flow in a hydrocyclones[J].Journal of Hydrodynamics,Ser.B,2009,21(3):408-414.
[11]Takacs I,Patry G,Nlasco D.A dynamic model of the clarification thickening process[J].Water Research,1991,25(10):1 263.
[12]陶洪飞,邱秀云,赵丽娜,等.水沙分离鳃内部流场数值模拟与验证[J].农业工程学报,2013,29(17):38-46.
[13]罗菲,邱秀云,李琳.单鳃片分离鳃固液两相流流场三维数值模拟[J].新疆农业大学学报,2011,34(3):253-258.
[14]谭义海,李琳,邱秀云,等.梭锥管混浊流体分离装置水沙分离影响因素优化试验研究[J].中国农村水利水电,2011,(5):50-52.
[15]李琳,邱秀云,龚守远,等.浑水水力分离清水装置内水沙两相[J].中国农村水利水电,2008,(1):11-15.
[16]王苗,李琳,杨海华,等.梭锥管与普通装置内水沙两相流场特性数值模拟[J].中国农村水利水电,2014,(1):111-117.
[17]田艳,张根广,秦子鹏.厢式沉沙池进口优化试验及流场三维数值模拟[J].中国农村水利水电,2013,(8):89-94.
[18]林刚毅,沈爱春,王跃奎,等.基于数值模拟的太湖流域地区节水条件下水田灌排水量研究[J].节水灌溉,2012,(1):11-14.