导叶出口边位置对井用潜水泵性能的影响
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摘要
为研究空间导叶出口边位置对井用潜水泵性能的影响规律,该文针对250QJ125型5级井用潜水泵,在其他几何参数均给定的条件下,通过沿轴向改变原始导叶的出口边位置,使其既满足与旋转轴线垂直又与半径线重合,设计了6个模型方案。基于雷诺时均N-S方程和RNG k-ε模型,采用SIMPLE算法对6个模型方案进行全流道三维数值模拟,获得各方案的扬程与效率,发现导叶出口边位置沿轴向延伸30 mm时,为最佳改进方案,此时模型泵水力效率提升1.2%,扬程增加6.8 m。同时根据各方案在设计工况下外特性的计算结果,提取各方案第1~5级的叶轮数据,发现原方案与最佳改进方案相比,首级叶轮水力效率、扬程基本相同,原方案的其余次级叶轮效率、扬程与其首级相比差距较大,最佳方案的其余次级叶轮效率与首级叶轮基本持平,扬程下降1 m,但是相比于原方案的其余各级扬程,均大约提升了2.2 m。最后分析了各方案在导叶出口截面上的内流场,结果表明:导叶出口边位置沿轴向延伸可改变液流在导叶出口处的流态,使其呈分散旋转流动,分散旋涡的数量与导叶叶片数相同;当导叶出口边延伸至适当位置时,能够减小下级叶轮的入口环量及冲击损失,改善导叶与下级叶轮之间的匹配关系。
The well submersible pumps have a large number of stages and complex structures.The inflow conditions of the secondary impeller are quite different from its first stage.Provided that the inflow conditions of the remaining secondary impeller inlets cannot be guaranteed,the efficiency will be significantly reduced as compared with the first stage impeller,which will result in a decrease of the overall efficiency of entire pump and uncontrollability of the pump design.Therefore,in order to study how the space guide vane ensures the inflow conditions of the secondary impeller,especially the influence of the outlet position of the space guide vane on the inflow conditions of secondary impeller,the 250QJ125 five-stage well submersible pump was studied as a model in this paper.Under the given conditions that other geometric parameters were fixed,the position of the outlet edge of the original guide vanes was changed along axial direction to make it both perfectly perpendicular to the rotation axis and coincide with the radius line,and 6 schemes were designed,including 1 original scheme and 5 improved schemes.Based on Reynolds time-averaged Navier-Stokes equations and RNG(re-normalization group)k-εmodel,the SIMPLE algorithm was used to perform the three-dimensional numerical simulation of the entire flow path.The head and efficiency of the schemes were obtained.It was found that the scheme in which guide vane outlet position extended30 mm along the axial direction had an increase of hydraulic efficiency of 1.2%compared with the original scheme,and the head increased by 6.8 m,and it was the best scheme.At the same time,according to the calculation results of the external characteristics under the design conditions of each scheme,the impeller data from the first to fifth stage of each scheme were extracted,and it was found that the hydraulic efficiency and head of the first stage impeller were basically the same with the best improved scheme.The remaining secondary impeller efficiency and head were quite different from those of the first stage.The remaining secondary impeller efficiency of the best improved scheme was basically the same as that of the first stage impeller,and the head reduced by 1 m;however,its head was approximately increased by 2.2 m compared with the heads of the other stages of the original scheme.Finally,the internal flow field of each scheme on the outlet section of the vanes was analyzed.The results showed that the vanes’outlet edge position along the axial direction can change the flow state of the water flow at the vanes’outlet,and make it a dispersed rotating flow.The number of dispersed vortices is as same as the number of blades of the guide vane.When the outlet edge of the guide vane extends to an appropriate position,the inlet ring volume and impact loss of the following stage impeller can be reduced.The matching relationship between the guide vanes and the following stage impeller can be improved.
The well submersible pumps have a large number of stages and complex structures.The inflow conditions of the secondary impeller are quite different from its first stage.Provided that the inflow conditions of the remaining secondary impeller inlets cannot be guaranteed,the efficiency will be significantly reduced as compared with the first stage impeller,which will result in a decrease of the overall efficiency of entire pump and uncontrollability of the pump design.Therefore,in order to study how the space guide vane ensures the inflow conditions of the secondary impeller,especially the influence of the outlet position of the space guide vane on the inflow conditions of secondary impeller,the 250QJ125 five-stage well submersible pump was studied as a model in this paper.Under the given conditions that other geometric parameters were fixed,the position of the outlet edge of the original guide vanes was changed along axial direction to make it both perfectly perpendicular to the rotation axis and coincide with the radius line,and 6 schemes were designed,including 1 original scheme and 5 improved schemes.Based on Reynolds time-averaged Navier-Stokes equations and RNG(re-normalization group)k-εmodel,the SIMPLE algorithm was used to perform the three-dimensional numerical simulation of the entire flow path.The head and efficiency of the schemes were obtained.It was found that the scheme in which guide vane outlet position extended30 mm along the axial direction had an increase of hydraulic efficiency of 1.2%compared with the original scheme,and the head increased by 6.8 m,and it was the best scheme.At the same time,according to the calculation results of the external characteristics under the design conditions of each scheme,the impeller data from the first to fifth stage of each scheme were extracted,and it was found that the hydraulic efficiency and head of the first stage impeller were basically the same with the best improved scheme.The remaining secondary impeller efficiency and head were quite different from those of the first stage.The remaining secondary impeller efficiency of the best improved scheme was basically the same as that of the first stage impeller,and the head reduced by 1 m;however,its head was approximately increased by 2.2 m compared with the heads of the other stages of the original scheme.Finally,the internal flow field of each scheme on the outlet section of the vanes was analyzed.The results showed that the vanes’outlet edge position along the axial direction can change the flow state of the water flow at the vanes’outlet,and make it a dispersed rotating flow.The number of dispersed vortices is as same as the number of blades of the guide vane.When the outlet edge of the guide vane extends to an appropriate position,the inlet ring volume and impact loss of the following stage impeller can be reduced.The matching relationship between the guide vanes and the following stage impeller can be improved.
引文
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[15]张人会,郭荣,杨军虎,等.基于CFD的空间导叶内部流场分析及优化设计[J].排灌机械工程学报,2015,33(9):762-767.Zhang Renhui,Guo Rong,Yang Junhu,et al.Analysis of flow in vane diffuser and its optimization based on CFDmethod[J].Journal of Drainage and Irrigation Machinery Engineering,2015,33(9):762-767.(in Chinese with English abstract)
[16]丛小青,王光辉,袁丹青,等.空间导叶式离心泵的数值计算及优化设计[J].排灌机械工程学报,2010,28(6):488-491.Cong Xiaoqing,Wang Guanghui,Yuan Danqing,et al.Numerical calculation and optimal design of centrifugal pump with space guide vanes[J].Journal of Drainage and Irrigation Machinery Engineering,2010,28(6):488-491.(in Chinese with English abstract)
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[19]张启华,徐燕,施卫东,等.多级离心泵圆周弯扭式导叶设计及性能试验[J].农业工程学报,2013,29(5):37-43.Zhang Qihua,Xu Yan,Shi Weidong,et al.Design and performance test of circumferential crankle guide vane of multistage centrifugal pumps[J].Transactions of the Chinese Society of Agricultural Engineering(Transactions of the CSAE),2013,29(5):37-43.(in Chinese with English abstract)
[20]钱卫东,王青,卢熙宁,等.多级离心泵级间匹配效应的研究[J].水泵技术,2017(2):28-32.Qian Weidong,Wang Qing,Lu Xining,et al.Study on the interstate matching effect of multistage centrifugal pump[J].Pump Technology,2017(2):28-32.(in Chinese with English abstract)
[21]王巍,王亚云,卢盛鹏,等.入口非均匀流对核主泵性能影响研究[J].大连理工大学学报,2017,57(5):453-458.Wang Wei,Wang Yayun,Lu Shengpeng,et al.Research on effects of non-uniform suction flow on performance in reactor coolant pump[J].Journal of Dalian University of Technology,2017,57(5):453-458.(in Chinese with English abstract)
[22]施卫东,张光建,张德胜,等.入口非均匀流对轴流泵性能和压力脉动的影响[J].排灌机械工程学报,2014,32(4):277-282.Shi Weidong,Zhang Guangjian,Zhang Desheng,et al.Effects of non-uniform suction flow on performance and pressure fluctuation in axial-flow pumps[J].Journal of Dalian University of Technology,2014,32(4):277-282.(in Chinese with English abstract)
[23]袁丹青,石荣,韩泳涛,等.深井离心泵新型空间导叶设计及优化[J].江苏大学学报:自然科学版,2015,36(6):661-665.Yuan Danqing,Shi Rong,Han Yongtao,et al.Design and optimization of new-type space guide vanes for deep-well centrifugal pump[J].Journal of Jiangsu University Natural Science Edition,2015,36(6):661-665.(in Chinese with English abstract)
[24]Liu H,Wang Y,Liu D,et al.Assessment of a turbulence model for numerical predictions of sheet-cavitating flows in centrifugal pumps[J].Journal of Mechanical Science and Technology,,2013,27(9):2743-2750.
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[26]梁金栋,陆林广,徐磊,等.轴流泵装置导叶出口液流速度环量对出液流道水力损失的影响[J].农业工程学报,2012,28(1):55-60.Liang Jindong,Lu Linguang,Xu Lei,et al.Influence of flow velocity circulation at guide vane outlet of axial-flow pump on hydraulic loss in outlet conduit[J].Transactions of the Chinese Society of Agricultural Engineering(Transactions of the CSAE),2012,28(1):55-60.(in Chinese with English abstract)
[2]郑录艳.井用潜水泵在水利工程中的应用[J].水利科技与经济,2014(2):76-77.
[3]方娟,孙云雷,王萍萍.井用潜水泵在中水加压泵站的应用[J].中国给水排水,2008,24(16):73-74.Fang Juan,Sun Yunlei,Wang Pingping,et al.Application of well submersible pump in reclaimed water booster pump house[J].China Water&Wastewater,2008,24(16):73-74.(in Chinese with English abstract)
[4]胡毓麟.浮箱式潜水泵在南海防暴雨内涝中的应用[J].广东科技,2011,20(14):91-92.
[5]王庆武.煤矿用潜水泵安全性能的研究[J].煤矿机电,2016(2):52-54.Wang Qingwu.Research on safety performance of mine submersible pump[J].Colliery Mechanical&Electrical Technology,2016(2):52-54.(in Chinese with English abstract)
[6]陆伟刚,庞杰文,施卫东,等.拉杆结构深井泵的设计[J].农业机械学报,2006,37(7):201-203.Lu Weigang,Pang Jiewen,Shi Weidong,et al.Design of deep well pump with pull rod structure[J].Transactions of the Chinese Society for Agricultural Machinery,2006,37(7):201-203.(in Chinese with English abstract)
[7]张启华,徐媛晖,徐燕,等.150QJS20型精铸不锈钢深井泵的开发[J].排灌机械工程学报,2014,32(5):382-387.Zhang Qihua,Xu Yuanhui,Xu Yan,et al.Development of150QJS20 stainless steel casting multistage deep-well pump[J].Journal of Drainage and Irrigation Machinery Engineering,2014,32(5):382-387.(in Chinese with English abstract)
[8]周岭,白玲,杨阳,等.导叶叶片数对井用潜水泵性能的影响[J].农业机械学报,2016,47(10):78-84.Zhou Ling,Bai Ling,Yang Yang,et al.Influence of diffuser vane number on submersible well pump performance[J].Transactions of the Chinese Society for Agricultural Machinery,2016,47(10):78-84.(in Chinese with English abstract)
[9]施卫东,王川,司乔瑞,等.级间间隙对新型井泵性能的影响[J].排灌机械工程学报,2012,30(6):627-631.Shi Weidong,Wang Chuan,Si Qiaorui,et al.Influence of inter-stage seal clearance on performance of new-type well pump[J].Journal of Drainage and Irrigation Machinery Engineering,2012,30(6):627-631.(in Chinese with English abstract)
[10]高雄发,施卫东,张启华,等.井用潜水泵级间间隙泄漏CFD分析与试验[J].中国农村水利水电,2016(2):96-100.Gao Xiongfa,Shi Weidong,Zhang Qihua,et al.CFDanalysis and the experiment of inter-stage seal clearance on submersible well pumps[J].China Rural Water and Hydropower,2016(2):96-100.(in Chinese with English abstract)
[11]施卫东,杨阳,周岭,等.潜水泵缩比模型的相似性验证与内部流场分析[J].农业工程学报,2017,33(3):50-57.Shi Weidong,Yang Yang,Zhou Ling,et al.Verification of comparability and analysis of inner flow fields on scaling models of submersible well pump[J].Transactions of the Chinese Society of Agricultural Engineering(Transactions of the CSAE),2017,33(3):50-57.(in Chinese with English abstract)
[12]魏清顺,孙西欢,刘在伦,等.导流器几何参数对潜水泵性能影响的通径分析[J].排灌机械工程学报,2014,32(3):202-207.Wei Qingshun,Sun Xihuan,Liu Zailun,et al.Path analysis of effects of diffuser geometric parameters on performance of submersible pump[J].Journal of Drainage and Irrigation Machinery Engineering,2014,32(3):202-207.(in Chinese with English abstract)
[13]魏清顺,刘在伦.导流器叶片进口安放角对潜水泵性能的影响[J].中国电机工程学报,2012,32(14):109-115.
[14]周岭,施卫东,陆伟刚,等.井用潜水泵导叶的正交试验与优化设计[J].排灌机械工程学报,2011,29(4):312-315.Zhou Ling,Shi Weidong,Lu Weigang,et al.Orthogonal test and optimization design of submersible pump guide vanes[J].Journal of Drainage and Irrigation Machinery Engineering,2011,29(4):312-315.(in Chinese with English abstract)
[15]张人会,郭荣,杨军虎,等.基于CFD的空间导叶内部流场分析及优化设计[J].排灌机械工程学报,2015,33(9):762-767.Zhang Renhui,Guo Rong,Yang Junhu,et al.Analysis of flow in vane diffuser and its optimization based on CFDmethod[J].Journal of Drainage and Irrigation Machinery Engineering,2015,33(9):762-767.(in Chinese with English abstract)
[16]丛小青,王光辉,袁丹青,等.空间导叶式离心泵的数值计算及优化设计[J].排灌机械工程学报,2010,28(6):488-491.Cong Xiaoqing,Wang Guanghui,Yuan Danqing,et al.Numerical calculation and optimal design of centrifugal pump with space guide vanes[J].Journal of Drainage and Irrigation Machinery Engineering,2010,28(6):488-491.(in Chinese with English abstract)
[17]付强,王秀礼,袁寿其,等.气-液条件下导叶出口位置对反应堆冷却剂主泵性能的影响[J].核动力工程,2013,34(6):111-114.Fu Qiang,Wang Xiuli,Yuan Shouqi,et al.Effect of guide vane outlet position on nuclear reactor coolant pump under gas-liquid two-phase condition[J].Nuclear Power Engineering,2013,34(6):111-114.(in Chinese with English abstract)
[18]朱荣生,习毅,袁寿其,等.气液两相条件下核主泵导叶出口边安放位置[J].排灌机械工程学报,2013,31(6):484-489.Zhu Rongsheng,Xi Yi,Yuan Shouqi,et al.Position of guide vane trailing edge of nuclear reactor coolant pump under gas-liquid two phase condition[J].Journal of Drainage and Irrigation Machinery Engineering,2013,31(6):484-489.(in Chinese with English abstract)
[19]张启华,徐燕,施卫东,等.多级离心泵圆周弯扭式导叶设计及性能试验[J].农业工程学报,2013,29(5):37-43.Zhang Qihua,Xu Yan,Shi Weidong,et al.Design and performance test of circumferential crankle guide vane of multistage centrifugal pumps[J].Transactions of the Chinese Society of Agricultural Engineering(Transactions of the CSAE),2013,29(5):37-43.(in Chinese with English abstract)
[20]钱卫东,王青,卢熙宁,等.多级离心泵级间匹配效应的研究[J].水泵技术,2017(2):28-32.Qian Weidong,Wang Qing,Lu Xining,et al.Study on the interstate matching effect of multistage centrifugal pump[J].Pump Technology,2017(2):28-32.(in Chinese with English abstract)
[21]王巍,王亚云,卢盛鹏,等.入口非均匀流对核主泵性能影响研究[J].大连理工大学学报,2017,57(5):453-458.Wang Wei,Wang Yayun,Lu Shengpeng,et al.Research on effects of non-uniform suction flow on performance in reactor coolant pump[J].Journal of Dalian University of Technology,2017,57(5):453-458.(in Chinese with English abstract)
[22]施卫东,张光建,张德胜,等.入口非均匀流对轴流泵性能和压力脉动的影响[J].排灌机械工程学报,2014,32(4):277-282.Shi Weidong,Zhang Guangjian,Zhang Desheng,et al.Effects of non-uniform suction flow on performance and pressure fluctuation in axial-flow pumps[J].Journal of Dalian University of Technology,2014,32(4):277-282.(in Chinese with English abstract)
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