Numerical simulation and experimental of optimum hydraulic design for elbow inlet passage
ZHANG Chi1, LI Yanjun1, JIANG Hongyin2, YUAN Jianping1
1.National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2.Jiangsu Province Water Engineering Sci-tech Consulting Co., Ltd., Nanjing, Jiangsu 210000, China
Abstract:In order to analyze the relationship between pumping station engineering excavated volume of elbow inlet passage and hydraulic loss of passage, the inlet passage was designed. The 8 schemes of elbow inlet passage were designed. In examples 1-4, the floor tilt angle of the passage was different(in example 1, floor tilt angle was 0°). In examples 5-8, the radius of backward wall of the passage bending section was different. Based on the Reynolds averaged N-S equation, standard turbulent model and SIMPLEC algorithm, the 3-D flow field in 8 examples of elbow inlet passages was simulated in rated flow. The simulation results show that in examples 1-4, the floor tilt angle was raised. When the floor tilt angle was 7°, hydraulic loss of the passage increased slightly and the imported floor height of the passage was 1.15 m higher than that in example 1; the floor tilt angle continues to increase and hydraulic loss increased obviously. In examples 5-8, the radius of backward wall of the passage bending section decreased continuously. When the R was 1.03 times longer than impeller diameter, hydraulic loss was 14.5 mm higher than that in example 1(hydraulic loss was measured by height of the water column)and the floor height of the passage was 0.36 m higher than that in example 1. If the R continues to decrease, hydraulic loss increased obviously. The model test for the preferred example of floor tilt angle 7° was conducted. The results were basically in agreement with calculated results.
[1]朱红耕,袁寿其,刘厚林. 肘形进水流道对立式轴流泵水力性能影响的数值模拟[J].农业工程学报,2006,22(2):6-9. ZHU Honggeng, YUAN Shouqi, LIU Houlin. Numerical simulation of the influence of elbow inlet passages on the hydraulic characteristics of vertical axial-flow pumps [J]. Transactions of the CASE, 2006, 22(2): 6-9.(in Chinese)[2]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. CHEN Li, LIU Chao, XIE Weidong, et al. A numerical optimization research of large pumping station for elbow inlet passage[J].Drainage and irrigation machinery, 2002,20(6):19-22.(in Chinese)[3]梁金栋,陆林广,徐磊,等. 中隔墩对大型泵站进水流道水力性能的影响[J].南水北调与水利科技,2013,12(11):102-105. LIANG Jindong, LU Linguang, XU Lei, et al. Inf-luence of middle division pier on the hydraulic perfo-rmance for inlet conduit of a large-scale pumping station[J]. South-to-north water transfers and water science & techology,2013,12(11):102-105.(in Chinese)[4]丁军,丁庆朋. 胥浦活水泵站肘形进水流道流态分析及优化[J].水利水运工程学报,2015,6(3):88-94. DING Jun, DING Qingpeng. Flow pattern analysis and optimization of elbow inlet conduits of Xupu running water pumping station[J].Hydro-science and engineering,2015,6(3):88-94.(in Chinese)[5]张平,于国平,李永顺,等.长沟泵站泵装置流道优化与选型研究[J]. 南水北调与水利科技,2009,7(6):157-160. ZHANG Ping, YU Guoping, LI Yongshun, et al. Flow channel hydraulic optimization and test of mode pump devices at the Changgou pump station[J]. South-to-north water transfers and water science & technology, 2009,7(6):157-160.(in Chinese)[6]施伟,李彦军,邓东升,等.肘形进水流道优化设计与数值计算[J].流体机械,2009,37(12):19-23 SHI Wei, LI Yanjun, DENG Dongsheng, et al. Optimum hydraulic design and model test for elbow inlet passage[J].Fluid machinery, 2009,37(12):19-23.(in Chinese)[7]徐磊,陆林广,梁金栋,等. 低扬程泵装置优化水力设计的关键问题[J].水利水运工程学报,2012(2):62-69. XU Lei, LU Linguang, LIANG Jindong, et al. A study of the key problem of optimum hydraulic design for a pump system with a low head[J].Hydro-science and engineering, 2012(2):62-69.(in Chinese)[8]陈伟,陆林广,王刚,等.轴流泵运行工况对叶轮室进口预旋的影响[J].水力发电学报,2012,31(1):213-219. CHEN Wei, LU Linguang, WANG Gang, et al. Influence of axial-flow pump operating condition on the pre-swirl at impeller chamber inlet[J]. Journal of hydroelectric engineering, 2012,31(1):213-219.(in Chinese)[9]杨得志.钟形进水流道出口PIV流场测试与数值模拟[D].扬州:扬州大学,2011.[10]王伟忠. 轴流泵叶轮环形进口断面流速LDV测试研究[D].扬州:扬州大学,2011.[11]付强,袁寿其,朱荣生. 大型给水泵站进、水流道数值模拟及优化设计[J].中国给水排水,2012,28(1):48-51. FU Qiang, YUAN Shouqi, ZHU Rongsheng. Numerical simulation and optimal design of inflow and outflow conduits of large pump station[J].China water & wastewater, 2012,28(1):48-51.(in Chinese)[12]Constantinescu G S, Patel V C. Numerical model for simulation of pump-intake flow and vortices.[J]. Journal of hydraulic engineering, 1998, 124(2): 123-134.[13]施伟,李彦军,邓东升,等.肘形进水流道优化设计与数值计算[J]. 流体机械,2009,37(12):19-23. SHI Wei, LI Yanjun, DENG Dongsheng, et al. Optimum hydraulic design and model test for elbow inlet passage[J].Fluid machinery, 2009,37(12):19-23.(in Chinese)[14]李彦军,颜红勤,葛强,等.大型低扬程泵装置优化设计与试验[J].农业工程学报,2010,26(9):144-149. LI Yanjun, YAN Hongqin, GE Qiang, et al. Optimum hydraulic design and model test of large-scale low-lift pump devices[J]. Transactions of the CASE, 2010, 26(9): 144-148.(in Chinese)[15]莹雷.大中型泵站肘形进水流道标准化研究[D].扬州:扬州大学,2013.[16]中华人民共和国水利部. 离心泵、混流泵、轴流泵试验方法:SL 140-2006[S]. 北京:中国水利水电出版社,2007.[17]CHEN Li, LIU Chao, XUE Jian, et al. Hydraulic performance study on the flow of elbow-inlet passage by numerical simulation of CFD[J].Journal of basic science and engineering, 2008,16:892-899.[18]李彦军,颜红勤,严登丰,等.非对称入流工况下钟形进水流道数值模拟试验研究[J].中国农村水利水电,2008(2):70-73. LI Yanjun, YAN Hongqin, YAN Dengfeng, et al. Numerical simulation and experimental study on bell shaped suction box under non symmetric inflow conditions[J].China rural water and hydropower, 2008(2):70-73.(in Chinese)