轴流泵装置分部结构对装置性能的影响分析
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摘要
基于k-ε紊流模型和雷诺时均N-S方程,运用CFX软件对轴流泵装置进行三维流动数值仿真计算,分析各分部结构对水泵性能及泵装置性能的影响,以找寻泵装置优化设计中的关键部件。计算结果表明,肘形进水流道能保证良好的进水条件,使叶轮进口流速均匀度达到90%以上,叶轮效率达到92%左右的较高数值。肘形进水流道的水力损失取决于弯肘段的水力损失;出水流道产生的水力损失在整个泵装置中占比最大,出水流道弯段和出口的水力损失为主要部分;因此进水流道弯段和出水流道是泵装置优化设计的关键部件。出水流道中涡量沿程减小,在流道弯段涡量下降最大,且流量越小下降的越大。
The impacts of component structures of axial flow pump on its performance were investigated based on the k-epsilon turbulent flow model and the Reynolds-averaged N-S equation with CFX software to numerically simulate three-dimensional flow.It can help us to find key components in the pump design.The results showed that an elbow-shape flow inlet can ensure continuously water movement,makes the flow uniformity of impeller reach 90 or more and the efficiency of the impeller about92%.The hydraulic loss of the entire inlet passage depends on the hydraulic loss of the elbow and accordingly the hydraulic loss generated by the outlet passage is the largest among the entire pump.The main hydraulic losses mainly come from the bend and the outlet.Therefore,inflow bend section and the outlet are the key components of the pump design.In the outlet channel,the vorticity decreases along the path,and reached its maximum magnitude in the curved section where the flow rate also reached its smallest.
The impacts of component structures of axial flow pump on its performance were investigated based on the k-epsilon turbulent flow model and the Reynolds-averaged N-S equation with CFX software to numerically simulate three-dimensional flow.It can help us to find key components in the pump design.The results showed that an elbow-shape flow inlet can ensure continuously water movement,makes the flow uniformity of impeller reach 90 or more and the efficiency of the impeller about92%.The hydraulic loss of the entire inlet passage depends on the hydraulic loss of the elbow and accordingly the hydraulic loss generated by the outlet passage is the largest among the entire pump.The main hydraulic losses mainly come from the bend and the outlet.Therefore,inflow bend section and the outlet are the key components of the pump design.In the outlet channel,the vorticity decreases along the path,and reached its maximum magnitude in the curved section where the flow rate also reached its smallest.
引文
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[16]王福军.计算流体动力学分析[M].北京:清华大学出版社,2004.(WANG F J,Computational fluid dynamics analysis[M].Beijing:Publishing House of Tsinghua University,2004.(in Chinese))
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[18]杨帆,刘超,汤方平,等.大型立式轴流泵装置流道内部流动特性分析[J].农业机械学报,2011,42(5):39-43,55.(YANG F,LIU C,TANG F P,et al.Characteristics of flow in large vertical axial flow pumping system[J].Transaction of the Chinese Society for Agriculture Machinery,2011,42(5):39-43,55.(in Chinese))
[19]成立,刘超.低扬程泵装置流动特性及水力性能研究进展[J].水利水电科技进展,2008,28(4):85-88.(CHENG L,LIU C.Advances in research on flow characteristics and hydraulic performances of low lift head pumping station[J].Progress in Water Resources and Hydropower Science and Technology,2008,28(4):85-88.(in Chinese))
[20]查智力,刘超,严天序,等.井筒式泵装置水力特性数值模拟[J].南水北调与水利科技,2018,16(2):189-195.(ZHA Z L,LIU C,YAN T X,et al.Numerical simulation of hydraulic characteristics of wellbore pump installation[J].South-to-north Water Transfers and Water Science and Technology,2018,16(2):189-195.(in Chinese))DOI:10.13476/j.cnki.nsbdqk.2018.0058.
[21]刘超,梁豪杰,金燕,等.立式轴流泵进水流场PIV测量[J].农业机械学报,2015,46(8):33-41.(LIU C,LIANG H J,JIN Y,et al.PIV measurements of intake flow field in axial-flow pump[J].Transaction of the Chinese Society for Agriculture Machinery,2015,46(8):33-41.(in Chinese))DOI:10.6041/j.issn.1000-2015.08.006.
[2]杨帆,刘超.低扬程泵装置的研究进展及展望[J].水利与建筑工程学报,2012,10(4):84-91.(YANG F,LIUC,Research progress and prospect of low-lift pump system[J].Journal of Water Resources and Architectural Engineering,2012,10(4):84-91.(in Chinese))
[3]刘超.水泵及水泵站[M].北京:中国水利水电出版社,2012.(LIU C,Pump and pumping station[M].Beijing,Publishing House of Chinese hydropower,2012.(in Chinese))
[4]谢传流,汤方平,朱泉荣,等.钟型进水流道轴流泵装置数值优化与试验分析[J].农业机械学报,2018,49(5):195-203.(XIE C L,TANG F P,ZHU Q R,et al.Numerical optimization and experimental analysis of axialflow pump system for bell-type inlet passage[J].Transaction of the Chinese Society for Agriculture Machinery,2018,49(5):195-203.(in Chinese))DOI:10.6041/j.issn.1000-1298.2018.05.022.
[5]王芃也.蜷曲式虹吸出水流道泵装置水力特性及优化[D].扬州:扬州大学,2017(WANG P Y.Hydraulic performance and optimizations of the curled up type of siphon outlet conduit pump device[D].Yangzhou:Yangzhou University,2017.(in Chinese))
[6]孙衍,李尚红,颜蔚,等.竖井式贯流泵装置进出水流道优化CFD[J].中国农村水利水电,2018(8):186-193.(SUN Y,LI S H,YAN W,et al.Research on the inlet and outlet passage of the shaft tubular pump system[J].China Rural Water and Hydropower,2018(8):186-193.(in Chinese))
[7]汤方平,袁家博,周济人.进水流道对泵性能的影响[J].水泵技术,1994(4):20-21.(TANG F P,YUAN JB,ZHOU J R.Influence of inlet flow passage on pump performance[J].Pump technology,1994(4):20-21.(in Chinese))
[8]刘为民,刘超.泵站进水流道对泵性能影响的研究[J].江苏科技大学学报(自然科学版),2007,21(2):75-79.(LIU W M,LIU C.Influence of Inlet Conduit on Operating Performance of Pump[J].Journal of Jiangsu University of Science and Technology(Natural Science Edition),2007,21(2):75-79.(in Chinese))
[9]杨帆,刘超,汤方平,等.基于全流道模拟的泵装置出水流道水力特性分析[J].农业机械学报,2014,45(3):83-89.(YANG F,LIU C,TANG F P,et al.Analysis of hydraulic performance of outlet passage based on simulation of steady flow in whole passage of axial-flow pumping system[J].Transaction of the Chinese Society for Agriculture Machinery,2014,45(3):83-89.(in Chinese))DOI:10.6041/j.issn.1000-1298.2014.03.015.
[10]成立,刘超,谢伟东,等.大型泵站肘形弯管进水流道数值优化研究[J].排灌机械,2002,20(6):19-22.(CHENG L,LIU C,XIE W D,et al.Optimum numerical design of elbow tube of pumping station[J].Drainage and irrigation machinery,2002,20(6):19-22.(in Chinese))
[11]朱红耕,袁寿其,刘厚林,等.进水流道对立式混流泵装置能量特性的影响[J].江苏大学学报(自然科学版),2007,28(1),46-50.(ZHU H G,YUAN S Q,LIU H L,et al.Influence of suction box on energy characteristics of vertical mixed-flow pumping systems[J].Journal of Jiangsu University(Natural Science Edition),2007,28(1),46-50.(in Chinese))
[12]李彦军,颜红勤,葛强,等.泵站虹吸式出水流道优化设计[J].排灌机械,2008,26(4):43-47.(LI Y J,YANH Q,GE Q,et al.Optimum hydraulic design for siphon outlet in large pumping stations[J].Drainage and Irrigation Machinery,2008,26(4):43-47.(in Chinese))
[13]汤方平,袁家博,周济人.轴流泵站进出水流道水力损失的试验研究[J].排灌机械,1995(3):13-14.(TANG F P,YUAN J B,ZHOU J R.Experimental study on hydraulic loss of inlet and outflow channels of axial flow pumping station[J].Drainage and Irrigation Machinery,1995(3):13-14.(in Chinese))
[14]成立,刘超,周济人,等.低扬程排灌泵装置进出水流道研究进展及展望[J].灌溉排水学报,2008,27(1):112-114.(LI Y J,YAN H Q,GE Q,et al.Review and Prospect on Passage of Low-lift Pumping System for Irrigation and Drainage[J].Journal of Irrigation and Drainage,2008,27(1):112-114.(in Chinese))DOI:10.13522/j.cnki.ggps.2008.01.009.
[15]严天序,刘超,查智力,等.导叶进口安放角对轴流泵性能的影响[J].水利水电技术,2018,49(6):72-78.(YAN T X,LIU C,ZHA Z L,et al.Influence of installation angle of guide-vane inlet on axial flow pump performance[J].Water Conservancy and Hydropower Technology,2018,49(6):72-78.(in Chinese))DOI:10.13928/j.cnki.wrahe.2018.06.011.
[16]王福军.计算流体动力学分析[M].北京:清华大学出版社,2004.(WANG F J,Computational fluid dynamics analysis[M].Beijing:Publishing House of Tsinghua University,2004.(in Chinese))
[17]刘超,汤方平,周济人,等.大型立式轴流泵装置的性能和稳定性分析[J].中国给水排水,2003,19(3):69-71.(LIU C,TANG F P,ZHOU J R,et al.Performance and stability analysis of large vertical axial flow pumps[J].China Water Supply and Drainage,2003,19(3):69-71.(in Chinese))
[18]杨帆,刘超,汤方平,等.大型立式轴流泵装置流道内部流动特性分析[J].农业机械学报,2011,42(5):39-43,55.(YANG F,LIU C,TANG F P,et al.Characteristics of flow in large vertical axial flow pumping system[J].Transaction of the Chinese Society for Agriculture Machinery,2011,42(5):39-43,55.(in Chinese))
[19]成立,刘超.低扬程泵装置流动特性及水力性能研究进展[J].水利水电科技进展,2008,28(4):85-88.(CHENG L,LIU C.Advances in research on flow characteristics and hydraulic performances of low lift head pumping station[J].Progress in Water Resources and Hydropower Science and Technology,2008,28(4):85-88.(in Chinese))
[20]查智力,刘超,严天序,等.井筒式泵装置水力特性数值模拟[J].南水北调与水利科技,2018,16(2):189-195.(ZHA Z L,LIU C,YAN T X,et al.Numerical simulation of hydraulic characteristics of wellbore pump installation[J].South-to-north Water Transfers and Water Science and Technology,2018,16(2):189-195.(in Chinese))DOI:10.13476/j.cnki.nsbdqk.2018.0058.
[21]刘超,梁豪杰,金燕,等.立式轴流泵进水流场PIV测量[J].农业机械学报,2015,46(8):33-41.(LIU C,LIANG H J,JIN Y,et al.PIV measurements of intake flow field in axial-flow pump[J].Transaction of the Chinese Society for Agriculture Machinery,2015,46(8):33-41.(in Chinese))DOI:10.6041/j.issn.1000-2015.08.006.