颗粒粒径对导叶式离心泵动静叶栅内流动的影响
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摘要
为了研究不同粒径的颗粒对动静叶栅内固液两相涡流结构演化过程的影响,以导叶式离心泵作为研究对象,采用ICEM软件对研究对象进行六面体网格划分,选用Mixture混合模型和LES大涡模拟对导叶式离心泵进行全流场三维模拟计算.对比分析0.1,0.2和0.3 mm这3种粒径下的颗粒对动静叶栅内涡量演化和叶轮-导叶内压力脉动,结果表明:随着颗粒粒径不断增大,叶轮区域颗粒体积分数总体不断减小,而且颗粒分布更加不均匀,在导叶区域,随着颗粒粒径增大,导叶背面出现明显的颗粒聚积区.由于颗粒在叶轮、导叶内的受力不同,导致随着颗粒粒径的增大,导叶部分的压力不断减小,但叶轮区域压力变化并不明显.受到叶轮与导叶动静干涉的作用,颗粒在叶轮、导叶内受到的作用也不相同,尤其在叶轮与导叶交接处,脉动十分不稳定.
In order to study the effect of particle size on the evolution of solid-liquid two-phase vortex structure,the vane type centrifugal pump is taken as the research object.Using the ICEM software on the research object of hexahedral mesh generation,the Mixture model and the large eddy simulation(LES) is used to simulate the whole flow field of the vane type centrifugal pump.The effects of particle size on the evolution of vorticity and the pressure pulsation in the impeller-guide vanes were analyzed and compared with those of 0.1,0.2 and 0.3 mm.The results show that with the particle size increasing,the overall particle volume fraction in the impeller region decreases,and particle size distribution is more nonuniform.In the guide vane region,with the increase of the particle size,in backof the guide vane appeared an obvious particle aggregation area.Owing to the different force on the particles in impeller and guide vane,with the increase of the particle size,the pressure of the guide vane decreases,and the pressure in the impeller region is not obvious.Because of the rotor-stator interaction between the impeller and the guide blade,the action on the particles in the impeller and guide blade is not the same,especially at the joint of the impeller and guide vane,pressure fluctuation is very unstable.
In order to study the effect of particle size on the evolution of solid-liquid two-phase vortex structure,the vane type centrifugal pump is taken as the research object.Using the ICEM software on the research object of hexahedral mesh generation,the Mixture model and the large eddy simulation(LES) is used to simulate the whole flow field of the vane type centrifugal pump.The effects of particle size on the evolution of vorticity and the pressure pulsation in the impeller-guide vanes were analyzed and compared with those of 0.1,0.2 and 0.3 mm.The results show that with the particle size increasing,the overall particle volume fraction in the impeller region decreases,and particle size distribution is more nonuniform.In the guide vane region,with the increase of the particle size,in backof the guide vane appeared an obvious particle aggregation area.Owing to the different force on the particles in impeller and guide vane,with the increase of the particle size,the pressure of the guide vane decreases,and the pressure in the impeller region is not obvious.Because of the rotor-stator interaction between the impeller and the guide blade,the action on the particles in the impeller and guide blade is not the same,especially at the joint of the impeller and guide vane,pressure fluctuation is very unstable.
引文
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[15]GAO B,YANG M.Experimental research on salt-out particle motion and concentration distribution in a vortex pump volute[J].Journal of constructional steel research,2010,9(1):53-59.
[16]KITZHOFER J,ERGIN F G,JAUNET V.2D least squares matching applied to PIV challenge data(Part1)[C]//Proceedings of the 16th International Symposium on Applications of Laser Techniques to Fluid Mechanics,Lisbon,Portugal,2012:9-12.
[17]KADAMBI J R,SUBRAMANIAN C A.Investigations of particle velocities in a slurry pump using PIV:Part 1,the tongue and adjacent channel flow[J].Journal of energy resources technology,2004,126(4):271-278.
[2]章城,徐圣永,吕兆聪,等.离心泵内部两相流模拟及其叶轮的流固耦合分析[J].南水北调与水利科技,2015,13(3):506-509.ZHANG Cheng,XU Shengyong,LYU Zhaocong,et al.Numerical simulation of two-phase flow in centrifugal pump and analysis of fluid-structure interaction of the impeller[J].South-to-north water transfers and water science&technology,2015,13(3):506-509.(in Chinese)
[3]韩伟,岳婷,李仁年,等.基于大涡模拟的动静叶栅内固液两相流动[J].排灌机械工程学报,2015,33(11):940-944.HAN Wei,YUE Ting,LI Rennian,et al.Solid-liquid two-phase flow in rotor and stator cascades based on LES[J].Journal of drainage and irrigation machinery engineering,2015,33(11):940-944.(in Chinese)
[4]韩伟,金毅,李仁年,等.颗粒对离心泵内部压力脉动特性的影响[J].排灌机械工程学报,2015,33(6):467-474.HAN Wei,JIN Yi,LI Rennian,et al.Effects of particles on pressure fluctuation characteristics in centrifugal pump[J].Journal of drainage and irrigation machinery engineering,2015,33(6):467-474.(in Chinese)
[5]朱相源,江伟,李国君,等.导叶式离心泵内部流动特性数值模拟[J].农业机械学报,2016,47(6):34-41.ZHU Xiangyuan,JIANG Wei,LI Guojun,et al.Numerical analysis of the hydraulic performance in a centrifugal pump with the vane diffuser[J].Transactions of the CSAM,2016,47(6):34-41.(in Chinese)
[6]LIU S,TANG X,WU Y,et al.Simulation of dense solid-liquid two-phase flow in a pump impeller[C]//Proceedings of the ASME Heat Transfer/Fluids Engineering Summer Conference 2004,New York:ASME,2004:461-467.
[7]TANG X,WANG F,WU Y.An improved large eddy simulation of two-phase flows in a pump impeller[J].Acta mechanica sinica,2007,23(6):635-643.
[8]MEHTA M,KADAMBI J R,SASTRY S,et al.Study of particulate flow in the impeller of a slurry pump using PIV[C]//Proceedings of the ASME 2004 Heat Transfer/Fluids Engineering Summer Conference,New York:ASME,2004:489-499.
[9]MEHTA M,KADAMBI J R,SASTRY S,et al.Particle velocities in the rotating impeller of a slurry pump[C]//Proceedings of the ASME/JSME 2007 5th Joint Fluids Engineering Conference,New York:ASME,2007:369-378.
[10]杨彤,冯国泰.动静干涉下涡轮叶栅内部涡系结构分析[J].汽轮机技术,2013(5):321-325.YANG Tong,FENG Guotai.Study of vortex system on rotor/stator interaction in HP turbine casecades[J].Turbine technology,2013(5):321-325.(in Chinese)
[11]FENG J,BENRA F K,DOHMEN H J.Unsteady flow visualization at part-load conditions of a radial diffuser pump:by PIV and CFD[J].Journal of visualization,2009,12(1):65-72.
[12]FENG J,BENRA F K,DOHMEN H J.Application of different turbulence models in unsteady flow simulations of a radial diffuser pump[J].Forsch ingenieurwes,2010,74(3):123-133.
[13]FENG J,BENRA F K,DOHMEN H J.Comparison of periodic flow fields in a radial pump among CFD,PIV,and LDV results[J].International journal of rotating machinery,2009,2009:1-11.
[14]马超,葛冰,臧述升.基于PIV测试技术的涡轮动叶栅流场可视化研究[J].热能动力工程,2014,29(4):361-366.MA Chao,GE Bing,ZANG Shusheng.Visualization study of the flow field in a rotor cascade of a turbine based on the PIV measurement and testing technology[J].Journal of engineering for thermal energy&power,2014,29(4):361-366.(in Chinese)
[15]GAO B,YANG M.Experimental research on salt-out particle motion and concentration distribution in a vortex pump volute[J].Journal of constructional steel research,2010,9(1):53-59.
[16]KITZHOFER J,ERGIN F G,JAUNET V.2D least squares matching applied to PIV challenge data(Part1)[C]//Proceedings of the 16th International Symposium on Applications of Laser Techniques to Fluid Mechanics,Lisbon,Portugal,2012:9-12.
[17]KADAMBI J R,SUBRAMANIAN C A.Investigations of particle velocities in a slurry pump using PIV:Part 1,the tongue and adjacent channel flow[J].Journal of energy resources technology,2004,126(4):271-278.