Abstract:In order to analyze the effects of adjustable guide vane(AGV) on axial pumps working in saddle zone, in the hope of optimizing adjusting laws, performance test of a new axial-flow pump with AGV was carried out on the pump test bed. Q-H, Q-η and Q-P curves at different guide vane angles were obtained. The effects of AGV on hydraulic performance of the model pump in saddle zone were analyzed. The results show that, at the same flow rate, head and efficiency of axial flow pump increase as guide vane angle is adjusted from 0° to -5°. With AGV, the separation vortex in the flow channel is suppressed effectively; flow regime at pump outlet is optimized obviously; kinetic energy recovery rate is improved. Head and efficiency of the pump are improved by 0.15 m (0.046 9Hd) and 193% respectively. The critical flow discharge is decreased by 0.004 94 m3/s and the range of saddleshaped zone is narrowed by 6.64%, broadening the range of stable working zone. At guide vane angle of -5°-0°, the shaft power changes little. In this experiment, the best values of hydraulic performance obtained are at -5° guide vane angle, but they can be further improved.
[1]Wang Fujun, Li Yaojun, Cong Guohui, et al.CFD Simulation of 3D flow in largebore axialflow pump with halfelbow suction sump[J]. Journal of Hydrodynamics, 2006, 18(2):243-247.[2]耿卫明,刘超,汤方平.轴流泵叶轮出口流场的3D-PIV测量[J].河海大学学报:自然科学版,2010,38(5):517-520.Geng Weiming,Liu Chao, Tang Fangping. 3D-PIV measurement of flow field at outlet of runner of aixal flow pump[J]. Journal of Hohai University:Natural Sciences, 2010,38(5):517-520.(in Chinese)[3]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):41-43.Yang Fan, Liu Chao, Tang Fangping, et al. Characteristics of flow in large vertical axial flow pumping system[J]. Transactions of the Chinese Society for Agricultural Machinery, 2011,42(5):41-43. (in Chinese)[4]Kurokawa J, Matsui J, Baba Y, et al. Suppresion of performance curve instability in axial flow pump by new J-Groove [C]∥The 9th Asian International Conference on Fluid Machinery. Jeju, Korea:[s.n.], 2007.[5]钱忠东,王焱,郑彪,等.可调导叶式轴流泵水力特性数值模拟[J]. 水力发电学报, 2011,30(2):125-127.Qian Zhongdong, Wang Yan, Zheng Biao, et al. Numerical simulation and analysis of performance of axial flow pump with adjustable guide vanes[J]. Journal of Hydroelectric Engineering, 2011,30(2):125-127. (in Chinese)[6]Qian Z D, Wang Y, Huai W X, et al. Numerical simulation of water flow in an axial flow pump with adjustable guide vanes[J]. Journal of Mechanical Science and Technology, 2010, 24(4):974-976.[7]Alexey N K, Stanislav N K, Khin M A,et al. Simulation of flow inside an axialflow pump with adjustable guide vanes[C]∥2005 ASME Fluids Engineering Division Summer Meeting and Exhibition. Houston, USA:[s.n.], 2005.[8]李忠,杨敏官,王晓坤.导叶对轴流泵性能影响的试验[J]. 排灌机械, 2009, 27(1): 17-18.Li Zhong, Yang Minguan, Wang Xiaokun. Experimental study of guide vane influence on performance of axial flow pump[J]. Drainage and Irrigation Machinery, 2009, 27(1):17-18.(in Chinese)[9]胡健,黄胜,王培生.加导叶轴流泵水动力特性研究[J].水力发电学报,2008,27(1):32-36.Hu Jian, Huang Sheng, Wang Peisheng. Research on hydrodynamic characteristics of axial waterjet pump with guide vane[J]. Journal of Hydroelectric Engineering, 2008,27(1):32-36. (in Chinese)[10]Nemdili A, Ladouani A, Benslimane S M K. Application of an empirical method to deduce the performance of an axial pump for viscous fluids from experimental results of water[C]∥23rd IAHR Symposium. Yokohama:[s.n.], 2006.[11]关醒凡.现代泵技术手册[M]. 北京:宇航出版社,1995:332-335.[12]李忠,杨敏官,姬凯,等.轴流泵叶顶间隙空化流可视化实验研究[J].工程热物理学报,2011, 32(8):1317-1318.Li Zhong, Yang Minguan,Ji Kai,et al. Visualization research on cavitating flow in tip clearance of axialflow pump[J]. Journal of Engineering Thermophysics, 2011,32(8):1317-1318. (in Chinese)[13]杨懿. 泵测量不确定度及可靠性的试验研究[D].重庆:重庆大学光电工程学院,2010.[14]李慈祥,张仁田.移动最小二乘法在水泵性能曲线拟合中的应用[J].南水北调与水利科技,2011,9(2):91-93.Li Cixiang, Zhang Rentian. Application of moving least square method in curvefitting of pump performance[J].SouthtoNorth Water Diversion and Water Science & Technology,2011, 9(2):91-93.(in Chinese)[15]刘竹溪,刘景植.水泵及水泵站[M].北京:中国水利水电出版社,2009:77-79.