1. College of Energy & Electrical Engineering, Hohai University, Nanjing, Jiangsu 211100, China; 2. Main Irrigation Channel Management Division of Jiangsu Province, Huaian, Jiangsu 223200, China
Abstract:To solve the design problem of the axial-flow pump in a pumping station refurbishment projection in the South to North Water Diversion East Route, three-dimensional(3D)multi-parameter design of an axial-flow pump impeller was carried out by using BladeGen software. The whole axial-flow pump geometric model with designed impellers was established, and a structured mesh in the fluid domain was generated. The influences of design parameters of the impeller on the pump external hydraulic performance were analyzed through numerical simulations. Furthermore, the effects of a dominant parameter i.e., blade wrapping angle on pressure and velocity distributions over the blades and cavitation performance were clarified in terms of three wrapping angle profiles. According to the numerical results, design case 6, in which the hub ratio was 0.40, the maximum section thickness in the mid-chord was 10mm, and the blade section was airfoil B, was chosen eventually. In this design case, the pump head was 4.90m, the pump efficiency with suction and discharge pipes was 79.76%, and the impeller efficiency was 92.19% at the design flow rate. These performance parameters has met the design requirements, and were consistent with the corresponding experimental measurements. Therefore, the BladeGen software could produce more accurate 3D multi-parameter designs for an axial-flow pump impeller to reduce both number of design cases and workload in geometry modeling during the optimization process, and result in an improved pump efficiency.
[1]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)[2]张德胜,王海宇,施卫东,等.轴流泵多工况压力脉动特性试验[J].农业机械学报,2014,45(11):139-145. ZHANG Desheng, WANG Haiyu, SHI Weidong et al. Experimental investigation of pressure fluctuation with multiple flow rates in scaled axial flow pump[J]. Tran-sactions of the CSAM, 2014,45(11):139-145.(in Chinese)[3]彭敏,杨琼方,陈志敏,等. 轴流泵参数化设计及应力与模态特征分析[J]. 计算力学学报,2016,33(1):121-126. PENG Min,YANG Qiongfang, CHEN Zhimin,et al. Numerical design of an axial flow pump by means of parametric design, stress field and modal characteristics analysis[J]. Chinese journal of computational mechanics, 2016,33(1):121-126.(in Chinese)[4]曹树良,梁莉,祝宝山,等. 高比转速混流泵叶轮设计方法[J]. 江苏大学学报(自然科学版),2005,26(3): 185-188. CAO Shuliang, LIANG Li, ZHU Baoshan,et al. Design method for impeller of high specific speed mixed-flow pump[J]. Journal of Jiangsu University(natural science edition),2005,26(3): 185-188.(in Chinese)[5]万韬.轴流泵的参数化设计及数值模拟[D].武汉:华中科技大学,2013.[6]赵浩儒, 杨帆, 刘超,等. 立式轴流泵装置流道内部流动特性及消涡试验[J].流体机械,2016,44(3):1-5. ZHAO Haoru, YANG Fan, LIU Chao,et al. Analysis on the vortex flows and vortex suppression schemes of cube type inlet passage for pumping system[J]. Fluid machinery, 2016,44(3):1-5.(in Chinese)[7]YU Kang, CHENG Yongguang, ZHANG Xiaoxi. Hydraulic characteristics of a siphon-shaped overflow tower in a long water conveyance system: CFD simulation and analysis[J]. Journal of hydrodynamics, 2016, 28(4):564-575.[8]LI Yaojun, WANG Fujun. Numerical investigation of performance of an axial-flow pump with inducer[J]. Journal of hydrodynamics, 2007,19(6):705-711.[9]夏水晶,袁建平,孙潇,等.轴流泵叶片的参数化造型及多参数优化[J].排灌机械工程学报,2016,34(7):597-601. XIA Shuijing, YUAN Jianping, SUN Xiao, et al. Parametric modeling and multi-parameter optimization of axial-flow pump blade[J]. Journal of drainage and irrigation machinery engineering,2016,34(7):597-601.(in Chinese)[10]刘安然,施晶,石祥钟,等.基于BladeGen的混流水轮机转轮叶片优化研究[J]. 河北工程大学学报(自然科学版), 2014,31(2):93-97. LIU Anran, SHI Jing, SHI Xiangzhong, et al. Optimization research for Francis hydro turbine blade based on the BladeGen[J]. Journal of Hebei University of Engineering(natural science edition), 2014,31(2):93-97.(in Chinese)[11]张德胜,张启华,施卫东.叶片泵设计数值模拟基础与应用[M].北京:机械出版社,2015.12.[12]王振兴,徐明海.求解N-S方程的多边形网格与三角形网格对比[J].工程热物理学报,2008,29(7):1221-1223. WANG ZhenXing, XU Minghai. The comparison of polygonal mesh and triangular mesh for solving N-S equations[J]. Journal of engineering thermophysics,2008,29(7):1221-1223.(in Chinese)[13]LIU Yangwei, LU Lipeng, FANG Le, et al. Modifica-tion of spalart-allmaras model with consideration of turbulence energy backscatter using velocity helicity[J].Physics letters A,2011,375(24):2377-2381. [14]周大庆,刘敏,陈会向.虹吸式出水流道轴流泵装置全流道空化特性[J].华中科技大学学报(自然科学版),2017,45(1):128-132. ZHOU Daqing, LIU Min, CHEN Huixiang. Siphon outlet conduit on full passage cavitation characteristics of axial-flow pumping unit[J].Journal of Huazhong University of Science and Technology(natural science edition),2017,45(1):128-132.(in Chinese)