In order to explore the influence of the blade perforation near the inlet edge on cavitation performance of a centrifugal pump, a low specific-speed centrifugal pump was selected as the research object. Ten different sizes of pores were designed in the same place of blade inlet edge in the centrifugal pump. Based on SST k-ω turbulent model and Zwart cavitation model, under the condition of water medium, 10 different impellers were numerically simulated in the full flow passage and compared with the experimental results. The research shows that the blade perforation with the diameter of 8 mm near the inlet edge whose bubbles generates firstly improves not only head and efficiency but also cavitation performance remarkably. The blade perforation divides the general cavitation region into two in every flow passage. With the increase of pore, the low pressure area in runner reduces, then increases. The distribution of low-pressure area is the smallest when the diameter is 8 mm near the blade inlet edge. The amplitude of pressure fluctuation of perforated blade is apparently larger than that of prototype blade. With the increase of perforated position distance,the influence of perforated blade on flow field gradually decreases and disappeares completely at last in the volute.
ZHAO Wei-Guo-,,PAN Xu-Wei- et al. Effect of blade perforation near inlet edge on the cavitation performance of centrifugal pump[J]. Journal of Drainage and Irrigation Machinery Engin, 2019, 37(6): 461-468.
MOU Jiegang,CHEN Ying,GU Yunqing, et al. Fluid-solid interaction characteristics of a centrifugal pump under different cavitation levels[J].Journal of vibration and shock, 2016, 35(23): 203-208.(in Chinese)
XIAO Liqian,LI Yibin,LIU Yi,et al. Effect of wear-ring clearance on cavitation flow and performance of centrifugal pump with inducer[J]. Journal of drainage and irrigation machinery engineering,2016,34(8): 657-664.(in Chinese)
关醒凡. 现代泵理论与设计[M]. 北京:中国宇航出版社,2011.
KUIPER G. New developments and propeller design[J]. Journal of hydrodynamics, 2010, 22(5): 7-16.
ARNDT R E A, ELLIS C R, PAUL S.Preliminary investigation of the use of air injection to mitigate cavi-tation erosion[J]. Journal of fluids engineeing, 1995,117:498-504.
WANG Yang,XIE Shanfeng,WANG Weijun. Numerical simulation of cavitation performance of low specific speed centrifugal pump with slotted blades[J]. Journal of drainage and irrigation machinery engineering,2016,34( 3): 210-215.(in Chinese)
WANG Wei,YI Qi,LIN Yin,et al. Impact of hydrofoil surface water injection on cavitation suppression[J].Journal of drainage and irrigation machinery enginee-ring,2016,34(10): 872-877.( in Chinese)
LIN Z, RUAN X, ZOU J, et al. Experimental study of cavitation phenomenon in a centrifugal blood pump induced by the failure of inlet cannula[J]. Chinese journal of mechanical engineering, 2014, 27(1):165-170.
VALDES J R, RODRÍGUEZ J M, MONGE R, et al. Numerical simulation and experimental validation of the cavitating flow through a ball check valve[J]. Energy conversion and management, 2014,78: 776-786.
杨倩. 基于不同湍流模型的离心泵内部流场数值模拟与分析[D]. 兰州:兰州理工大学, 2010.
BENNIA A, LOUKARFI L, KHELIL A, et al.Contribution to the experimental and numerical dynamic study of a turbulent jet issued from lobed diffuser[J]. Journal of applied fluid mechanics, 2016, 9(6): 2957-2967.
CHENG H, LONG X, BIN J I, et al. Numerical investigation of unsteady cavitating turbulent flows around twisted hydrofoil from the Lagrangian viewpoint[J]. Journal of Hydrodynamics, Ser. B, 2016, 28(4): 709-712.