叶片包角对低比转速离心泵固液两相非定常流动的影响
|
摘要
为了探索叶片包角在固液两相流下对低比转速离心泵非定常特性的影响,利用ANSYS CFX软件采用Mixture多相流模型对4种不同叶片包角离心泵的固液两相湍流进行了非定常数值模拟,分析了叶片包角对离心泵瞬时扬程、压力及压力脉动的影响。研究表明:随着叶片包角的增大,瞬时扬程会降低,并且降低速度越来越快;叶片包角每增大10°,瞬时扬程的波动时间延迟0. 000 52 s。随着叶片包角的增大,叶片工作面与叶片背面的压力会降低。叶片包角每增加10°,固液两相流时离心泵的压力脉动时间均向后延迟0. 007 s。不同包角下的主要脉动幅值均出现在转频处。颗粒浓度为0. 02和0. 05时,压力脉动最小值均出现在叶片包角值为140°时;当颗粒浓度为0. 1时,脉动幅值随着叶片包角的增大而减小,叶片包角从130°增加到160°时,此时的压力脉动受到叶片包角的影响最为严重,脉动幅值减小了14. 52%。因此,在高颗粒浓度下适当增加叶片包角可以改善固液两相离心泵的压力脉动。
In order to explore the effect of blade packet angle on the unsteady characteristics of centrifugal pump with low ratio speed in solid-liquid two-phase flow,this paper uses ANSYS CFX software to simulate the solid-liquid two-phase turbulent flow with 4 different blade packet angles by using the mixture multiphase stream model,and analyzes the effects on the instantaneous head of the centrifugal pump,and on the pressure and pressure pulsation. The results show that with the increase of the blade packet angle,the instantaneous head decreases and the speed decreases more and faster,and the fluctuation time of the instantaneous head is delayed by 0. 000 52 s for each increase of the 10° of the blade. The pressure on both blade surfaces will also decrease. For every 10° increase in the blade angle,the pressure pulsation time of the centrifugal pump is delayed backward by 0. 007 s at the solid-liquid two-phase flow. The main pulsating amplitude at different packet angles appears at the frequency shift. When the particle concentration is 0. 02 and 0. 05,the minimum value of pressure pulsation appears when the blade packet angle value is 140°. With the particle concentration of 0. 1,the pulsating amplitude decreases with the increase of the blade packet angle. When the blade packet angle increases from 130° to 160°,the pressure pulsation is most seriously affected by the blade packet angle,with the pulsating amplitude reduction of 14. 52%.Therefore,the pressure pulsation of solid-liquid two-phase centrifugal pump can be improved by increasing the blade packet angle appropriately at high particle concentration.
In order to explore the effect of blade packet angle on the unsteady characteristics of centrifugal pump with low ratio speed in solid-liquid two-phase flow,this paper uses ANSYS CFX software to simulate the solid-liquid two-phase turbulent flow with 4 different blade packet angles by using the mixture multiphase stream model,and analyzes the effects on the instantaneous head of the centrifugal pump,and on the pressure and pressure pulsation. The results show that with the increase of the blade packet angle,the instantaneous head decreases and the speed decreases more and faster,and the fluctuation time of the instantaneous head is delayed by 0. 000 52 s for each increase of the 10° of the blade. The pressure on both blade surfaces will also decrease. For every 10° increase in the blade angle,the pressure pulsation time of the centrifugal pump is delayed backward by 0. 007 s at the solid-liquid two-phase flow. The main pulsating amplitude at different packet angles appears at the frequency shift. When the particle concentration is 0. 02 and 0. 05,the minimum value of pressure pulsation appears when the blade packet angle value is 140°. With the particle concentration of 0. 1,the pulsating amplitude decreases with the increase of the blade packet angle. When the blade packet angle increases from 130° to 160°,the pressure pulsation is most seriously affected by the blade packet angle,with the pulsating amplitude reduction of 14. 52%.Therefore,the pressure pulsation of solid-liquid two-phase centrifugal pump can be improved by increasing the blade packet angle appropriately at high particle concentration.
引文
[1]叶群,胡敬宁,汪家琼,等.固液两相流离心泵三维流场的非定常数值模拟[J].中国农村水利水电,2014(10):76-79.YE Qun,HU Jing-ning,WANG Jia-qiong,et al.Unsteady numerical simulation of three-dimensional flow field of solid-liquid twophase flow centrifugal pump[J].Rural Water conservancy and hydropower in China,2014(10):76-79.
[2]韩伟,刘慧娟,苏敏,等.固液两相流对离心泵压力脉动特性的影响[J].热能动力工程,2017,32(8):57-62,148.HAN Wei,LIU Hui-juan,SU Min,et al.Effect of solid-liquid twophase flow on pressure pulsation characteristics of centrifugal pump[J].Journal of Engineering for Thermal Energy and Power,2017,32(8):57-62,148.
[3]张钊,苏敏,韩伟,等.螺旋离心泵固液两相非定常流动诱导力特性[J].排灌机械工程学报,2015,33(4):296-300.ZHANG Zhao,SU Min,HAN Wei,et al.Induced force characteristics of solid-liquid two-phase unsteady flow of spiral centrifugal pump[J].Journal of Irrigation and Drainage mechanical engineering,2015,33(4):296-300.
[4]ZHAO W,ZHAO G.Numerical investigation on the transient characteristics of sediment-laden two-phase flow in a centrifugal pump[J].Journal of Mechanical Science and Technology,2018,32(1):167-176.
[5]戴江,吴玉林,孙自祥,等.离心泵叶轮中固液两相紊流计算[J].工程热物理学报,1996(1):46-49.DAI Jiang,WU Yu-lin,SUN Zi-xiang,et al.Calculation of solidliquid two-phase turbulent flow in centrifugal pump impeller[J].Journal of Engineering Thermal Physics,1996(1):46-49.
[6]韩伟.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.Effects of particles on the internal pressure pulsation characteristics of centrifugal pump[J].Journal and Drainage Machanical Engineering,2015,33(6):467-474.
[7]廖姣,赖喜德,廖功磊,等.基于固液两相流的离心泵内部流场数值分析[J].热能动力工程,2017,32(5):95-99,139-140.LIAO Jiao,LAI Xi-de,LIAO Gong-lei,et al.Numerical analysis of internal flow field of centrifugal pump based on solid-liquid twophase flow[J].Journal of Engineering for Thermal Energy and Power,2017,32(5):95-99,139-140.
[8]郭仁宁,肖春艳,李国威.长短叶片离心泵内固液两相流场三维数值模拟[J].热能动力工程,2016,31(1):87-92,136.GUO Ren-ning,XIAO Chun-yan,LI Guo-wei.Three-dimensional numerical simulation of the internal solid-liquid two-phase flow field of the long-length blade centrifugal pump[J].Journal of Engineering for Thermal Energy and Power,2016,31(1):87-92,136.
[9]谭东华,朱祖超,崔宝玲.固液两相双流道泵的设计与试验研究[J].流体机械,2006(5):1-4.TAN Dong-hua,ZHU Zu-chao,CUI Bao-ling.Design and experimental study of solid-liquid two-phase dual-flow channel pump[J].Fluid Machinery,2006(5):1-4.
[10]咸丽霞.沙粒粒径与含量对水翼和离心泵瞬态空化影响的研究[D].兰州:兰州理工大学,2018.XIAN Li-xia.Effect of particle size and content of sand grains on transient cavitation of water wing and centrifugal pump[D].Lanzhou:Lanzhou University of Technology,2018.
[11]李世姗.动静叶栅内固液两相非定常流动特性研究[D].兰州:兰州理工大学,2016.LI Shi-shan.Study on the unsteady flow characteristics of solidliquid two-phase in static and dynamic cascade[D].Lanzhou:Lanzhou University of Technology,2016.
[12]ZHANG Yu-liang,LI Yi,CUI Bao-ling,et al.Numerical simulation and analysis of solid-liquid two-phase flow in centrifugal pump[J].Chinese Journal of Mechanical Engineering,2013,26(1):53-60.
[13]YANG Sun-sheng,KONG Fan-yu,CHEN Hao,et al.Effects of blade wrap angle influencing a pump as turbine[J].Journal of Fluids Engineering,2012,134(6):061102.
[14]谢志宾,陈二云,丁京涛,等.叶片包角对离心泵流场及脉动特性的影响[J].上海理工大学学报,2017,39(5):430-437.XIE Zhi-bin,CHEN Er-yun,DING Jing-tao,et al.Effect of blade packet angle on flow field and pulsating characteristics of centrifugal pump[J].Journal of Shanghai Polytechnic University,2017,39(5):430-437.
[15]关醒凡.现代泵设计理论[M].北京:宇航出版社,2010.GUAN Xing-fan.Modern pump design theory[M].Beijing:Aerospace Press,2010.
[2]韩伟,刘慧娟,苏敏,等.固液两相流对离心泵压力脉动特性的影响[J].热能动力工程,2017,32(8):57-62,148.HAN Wei,LIU Hui-juan,SU Min,et al.Effect of solid-liquid twophase flow on pressure pulsation characteristics of centrifugal pump[J].Journal of Engineering for Thermal Energy and Power,2017,32(8):57-62,148.
[3]张钊,苏敏,韩伟,等.螺旋离心泵固液两相非定常流动诱导力特性[J].排灌机械工程学报,2015,33(4):296-300.ZHANG Zhao,SU Min,HAN Wei,et al.Induced force characteristics of solid-liquid two-phase unsteady flow of spiral centrifugal pump[J].Journal of Irrigation and Drainage mechanical engineering,2015,33(4):296-300.
[4]ZHAO W,ZHAO G.Numerical investigation on the transient characteristics of sediment-laden two-phase flow in a centrifugal pump[J].Journal of Mechanical Science and Technology,2018,32(1):167-176.
[5]戴江,吴玉林,孙自祥,等.离心泵叶轮中固液两相紊流计算[J].工程热物理学报,1996(1):46-49.DAI Jiang,WU Yu-lin,SUN Zi-xiang,et al.Calculation of solidliquid two-phase turbulent flow in centrifugal pump impeller[J].Journal of Engineering Thermal Physics,1996(1):46-49.
[6]韩伟.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.Effects of particles on the internal pressure pulsation characteristics of centrifugal pump[J].Journal and Drainage Machanical Engineering,2015,33(6):467-474.
[7]廖姣,赖喜德,廖功磊,等.基于固液两相流的离心泵内部流场数值分析[J].热能动力工程,2017,32(5):95-99,139-140.LIAO Jiao,LAI Xi-de,LIAO Gong-lei,et al.Numerical analysis of internal flow field of centrifugal pump based on solid-liquid twophase flow[J].Journal of Engineering for Thermal Energy and Power,2017,32(5):95-99,139-140.
[8]郭仁宁,肖春艳,李国威.长短叶片离心泵内固液两相流场三维数值模拟[J].热能动力工程,2016,31(1):87-92,136.GUO Ren-ning,XIAO Chun-yan,LI Guo-wei.Three-dimensional numerical simulation of the internal solid-liquid two-phase flow field of the long-length blade centrifugal pump[J].Journal of Engineering for Thermal Energy and Power,2016,31(1):87-92,136.
[9]谭东华,朱祖超,崔宝玲.固液两相双流道泵的设计与试验研究[J].流体机械,2006(5):1-4.TAN Dong-hua,ZHU Zu-chao,CUI Bao-ling.Design and experimental study of solid-liquid two-phase dual-flow channel pump[J].Fluid Machinery,2006(5):1-4.
[10]咸丽霞.沙粒粒径与含量对水翼和离心泵瞬态空化影响的研究[D].兰州:兰州理工大学,2018.XIAN Li-xia.Effect of particle size and content of sand grains on transient cavitation of water wing and centrifugal pump[D].Lanzhou:Lanzhou University of Technology,2018.
[11]李世姗.动静叶栅内固液两相非定常流动特性研究[D].兰州:兰州理工大学,2016.LI Shi-shan.Study on the unsteady flow characteristics of solidliquid two-phase in static and dynamic cascade[D].Lanzhou:Lanzhou University of Technology,2016.
[12]ZHANG Yu-liang,LI Yi,CUI Bao-ling,et al.Numerical simulation and analysis of solid-liquid two-phase flow in centrifugal pump[J].Chinese Journal of Mechanical Engineering,2013,26(1):53-60.
[13]YANG Sun-sheng,KONG Fan-yu,CHEN Hao,et al.Effects of blade wrap angle influencing a pump as turbine[J].Journal of Fluids Engineering,2012,134(6):061102.
[14]谢志宾,陈二云,丁京涛,等.叶片包角对离心泵流场及脉动特性的影响[J].上海理工大学学报,2017,39(5):430-437.XIE Zhi-bin,CHEN Er-yun,DING Jing-tao,et al.Effect of blade packet angle on flow field and pulsating characteristics of centrifugal pump[J].Journal of Shanghai Polytechnic University,2017,39(5):430-437.
[15]关醒凡.现代泵设计理论[M].北京:宇航出版社,2010.GUAN Xing-fan.Modern pump design theory[M].Beijing:Aerospace Press,2010.