Abstract:The impeller blade of a super-large capacity submersible axial-flow pump was designed based on the airfoil theory, the flow in the pump system was simulated by using computational fluid dynamics(CFD)method and the pump performance was predicted. The pump hydraulic model was optimized based on the numerical simulations of three different hydraulic models, and verified experimentally. It was shown that there is a noticed high-pressure region near the blade pressure side and the leading edge in the original impeller, additionally near the blade suction side and leading edge there exists a low-pressure region and an intensive vorticity, which consumes considerable energy resulting in a poorer hydraulic efficiency. The original impeller was optimized by increasing the inlet blade angle and reducing the rotational speed, consequently the optimized impeller is subject to a more uniform static pressure distribution in the blade pressure side and a shrunk vortex zone in the suction side with even vorticity. Clearly, the pump cavitation performance and hydraulic efficiency have been improved. The performance of optimized hydraulic model exhibits good agreement with the experimental data, indicating the numerical results can reveal the actual performance of a hydraulic model exactly. The methods adopted in this study may provide a reference for hydraulic model optimization and perfor-mance improvement of submersible axial-flow pumps.
[1]关醒凡.系列轴流泵模型试验研究成果报告[J].水泵技术,2005(4):12-15. Guan Xingfan. Test reports of a new series of axial-flow model pumps [J]. Pump Technology, 2005(4):12-15.(in Chinese)[2]柴胜凯.轴流泵叶轮设计与性能预估[D]. 西安:西安理工大学水利水电学院,2004.[3]刘超. 南水北调工程高比转速水泵装置的有关问题研究[J]. 水力发电学报,2005,24(1):88-92. Liu Chao. The investigation on high specific speed pump system in eastern route of the South-to-North Water Diversion Project of China [J]. Journal of Hydroelectric Engineering, 2005, 24(1):88-92.(in Chinese)[4]杨敬江,关醒凡.轴流泵水力模型内部流动数值模拟[J].流体机械,2008,36(12):15-19. Yang Jingjiang, Guan Xingfan. Numerical simulations of flow in an axial-flow pump model[J].Fluid Machinery, 2008,36(12):15-19.(in Chinese)[5]李龙,王泽.轴流泵内部流动的数值模拟研究[J].流体机械,2007,35(4):16-18. Li Long, Wang Ze. Numerical simulations of internal flow in an axial pump[J].Fluid Machinery, 2007,35(4):16-18.(in Chinese)[6]柴胜凯.轴流泵叶轮内部三维流动分析[J].排灌机械,2004,22(1):134-137. Cai Shengkai.Three-dimensional flow investigation of axial pump impeller[J]. Drainage and Irrigation Machinery, 2004,22(1):134-137.(in Chinese)[7]Benra Friedrich-Carl, Dohmen Hans Josef, Schmidt Marina. Flow phenomena in a highly-loaded single-stage axial-flow pump comparison of experimental and numerical results[C]//Proceedings of the 5th Joint ASME/JSME Fluids Engineering Summer Conference, 2007:979-984.[8]Zierke W C, Farrell K J. Measurments of the tip clea-rance flow for a high-Reynolds-number axial-flow rotor[J]. Journal of Tubomachinery,1995,117(4):522-532.[9]王福军,张玲,黎耀军,等. 轴流式水泵非定常湍流数值模拟的若干关键问题[J]. 机械工程学报,2008, 44(8):73-77. Wang Fujun, Zhang Ling, Li Yaojun, et al. Some key issues of unsteady turbulent numerical simulation in axial-flow pump[J]. Chinese Journal of Mechanical Engineering, 2008, 44(8):73-77.(in Chinese)[10]陈松山,葛强,周正富,等.大型泵站双向进水流道三维紊流数值模拟[J]. 江苏大学学报: 自然科学版, 2005, 26(2): 102-105. Chen Songshan, Ge Qiang, Zhou Zhengfu,et al. Numerical simulation of three-dimensional turbulent flow for reversible intake passage in large pumping stations[J]. Journal of Jiangsu University:Natural Science Edition, 2005, 26(2): 102-105.(in Chinese)[11]杨军虎,张炜,王春龙,等. 潜水轴流泵全流道三维湍流数值模拟及性能预估[J].排灌机械,2006,24(4):5-9. Yang Junhu,Zhang Wei,Wang Chunlong,et al. Numerical simulation of turbulent flow through full passage of submersible axial pump and performance predictions[J]. Drainage and Irrigation Machinery, 2006,24(4):5-9.(in Chinese)[12]关醒凡.现代泵技术手册[M].北京:中国宇航出版社,2011:306-341.[13]沈阳水泵研究所,中国农业机械化科学研究院. 叶片泵设计手册[M]. 北京:机械工业出版社,1983:262-308.