1. College of Water Conservancy & Hydropower Engineering, Hohai University, Nanjing, Jiangsu 210098, China; 2. College of Energy & Electrical Engineering, Hohai University, Nanjing, Jiangsu 210000, China; 3. Canal Irrigation Management of Jiangsu Province, Huaian, Jiangsu 223200, China
Abstract:In order to study influences of number of guide vanes and their relative position on the performance of an axial-flow pump unit, the diffusers with three different numbers of guide vanes and four different relative positions were designed. Base on computational fluid dynamics software, the flows under five working conditions of(0.8-1.2)Qd were calculated and analyzed for each diffuser model. According to the results of numerical simulation, the optimal diffuser model was selected, i.e. the number of guide vanes was 5 and the distance between the runner exit and the diffuser inlet was 0.086D, and then an experiment on the performance of a pump unit with this model was carried out. The experimental data were compared with the numerically simulated results. The results showed that at a constant number of impeller blades increased number of guide vanes raised the hydraulic loss across the diffuser and outlet conduit, resulting in a declined pump unit efficiency. When the numbers of impeller blades and guide vanes are kept constant, a too large or too small distance between the runner exit and the diffuser inlet decreases the hydraulic loss across the diffuser and outlet conduit as well as the outlet velocity circulation at the diffuser exit, showing an impaired pump unit efficiency. The error between experiment and numerical simulation was within 4%, confirming the reliable and accurate numerical simulations. The results can provide a reference for hydraulic design optimization of diffuser and efficiency improvement of pump unit.
郭楚,郑源*,周大庆,陈会向,戴启璠,梁豪杰. 导叶叶片数及导叶相对位置对低扬程轴流泵装置性能的影响[J]. 排灌机械工程学报, 2019, 37(3): 204-210.
GUO Chu, ZHENG Yuan*, ZHOU Daqing, CHEN Huixing, DAI Qifan, LIANG Haojie. Effects of number of guide vanes and their relative position on performance of a low head axial-flow pump unit. Journal of Drainage and Irrigation Machinery Engin, 2019, 37(3): 204-210.
[1]陆林广.高性能大型低扬程泵装置优化水力设计[M].北京:中国水利水电出版社,2013:4-5.[2]关醒凡.轴流泵和斜流泵[M].北京:中国宇航出版社,2009:32-36.[3]石丽建,汤方平,周捍珑,等.不同导叶叶片掠角下轴流泵段水力特性分析及试验[J].农业工程学报,2015,31(14):90-95. SHI Lijian,TANG Fangping,ZHOU Hanlong,et al.Axial-flow pump hydraulic analysis and experiment under different swept-angles of guide vane[J].Transactions of the CSAE, 2015,31(14):90-95.(in Chinese)[4]王俊,马鹏飞,王军,等.导叶出口安放角对双向轴流泵性能的影响[J].流体机械,2014,42(8):31-35. WANG Jun,MA Pengfei,WANG Jun,et al.Effects of guide vane outlet-stagger-angle on bidirectional axial pump performance[J].Fluid machinery,2014,42(8):31-35.(in Chinese)[5]李忠,杨敏官,王晓坤,等.导叶对轴流泵性能影响的试验[J].排灌机械,2009,27(1):15-18. LI Zhong,YANG Minguan,WANG Xiaokun,et al.Experimental study of guide vane influence on performance of axial-flow pump[J]. Drainage & irrigation machinery,2009,27(1):15-18.(in Chinese)[6]王福军.计算流体动力学分析——CFD软件原理与应用[M].北京:清华大学出版社,2004.[7]吴玉林,刘娟,陈铁军,等.叶片泵设计与实例[M].北京:机械工业出版社,2011.[8]梁金栋,陆林广,徐磊,等.轴流泵装置导叶出口水流速度环量对出水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 CSAE,2012,28(1):55-60.(in Chinese)[9]朱红耕,袁寿其.进口流场对虹吸式出水流道的性能影响[J].农业机械学报,2006,37(10):193-196. ZHU Honggen,YUAN Shouqi.Influence of inlet flow field on the performance of siphon outlet[J].Transactions of the CSAM,2006,37(10):193-196.(in Chinese)[10]谭淋露,冯建刚,陈毓陵,等.泵站虹吸式出水管数值计算及水力优化[J].中国农村水利水电,2014(3):126-129. TAN Linlu,FENG Jiangang,CHEN Yuling,et al.Nume-rical simulation and hydraulic optimization for siphon outlet pipe of pump stations[J].China rural water and hydropower,2014(3):126-129.(in Chinese)[11]杨春霞,郑源,李玲玉,等.超低水头竖井贯流式水轮机模型试验[J].水利水电科技进展,2012,32(6):87-90. YANG Chunxia,ZHENG Yuan,LI Lingyu,et al.Model test of tubular turbine under extremely low head[J].Advances in science & technology of water resources,2012,32(6):87-90.(in Chinese)[12]陈会向,郑源,周大庆,等.生态贯流泵装置能量特性研究[J].给水排水,2016,42(9):105-109. CHEN Huixiang,ZHENG Yuan,ZHOU Daqing,et al.Study on energy characteristics of ecological tubular pump [J].Water & wastewater engineering,2016,42(9):105-109.(in Chinese)