Abstract：Unsteady characteristics of blade hydraulic moment in centrifugal pumps are key factors having strong influence on pump operation. But there is few literature on the unsteady hydraulic moment currently. Thus, with CFD technology, the 3D unsteady flow numerical simulations were executed on a model of XS50—160/7.5 pump for capturing the flow character inside the impeller under 5 different operation conditions. And an experiment has been done for verification of the validity and accuracy. The hydraulic moment fluctuation and the pressure fluctuation on blade surface under 5 different operation conditions were obtained with the simulation. The result of the simulation showed that the blade passing frequency plays a dominant role in the fluctuation of the hydraulic moment at design and off-design conditions under various operating conditions. Meanwhile, the rotating frequency of impeller plays a dominant role in the pressure fluctuation in the impeller at design and off-design conditions. When the frequency is higher than the blade passing frequency, the strength of hydraulic moment pulsation and pressure pulsation on the surface of blade are both relatively weak. At design point, the minimum RMS of the hydraulic moment fluctuation occurred. With the deviation from the design point, the RMS value goes higher. The RMS values at low flow rate condition and at high flow rate condition are almost symmetrically distributed about the design point. The pressure fluctuation in the pressure surface of the blade is stronger than that in the suction surface,that in the outlet zone is stronger than in the inlet zone.
郭义航, 袁寿其, 骆寅, 孙慧. 基于CFD的离心泵叶片水力矩非定常特性[J]. 排灌机械工程学报, 2016, 34(6): 470-476.
GUO Yihang, YUAN Shouqi, LUO Yin, SUN Hui. Unsteady characteristics of blade hydraulic moment in centrifugal pumps with CFD. Journal of Drainage and Irrigation Machinery Engin, 2016, 34(6): 470-476.
[1]TAN L, CAO S, WANG Y, et al. Direct and inverse ite-rative design method for centrifugal pump impellers[J]. Journal of power and energy, 2012, 226(6):764-775.[2]邓东升, 马志华, 朱红耕. 轴流泵叶片水力矩三维紊流数值计算[J]. 排灌机械,2006,24(5):8-11. DENG Dongsheng, MA Zhihua, ZHU Honggeng. 3-D turbulent calculation of hydraulic moment of axial-flow pump blades[J]. Drainage and irrigation machinery, 2006, 24(5):8-11.(in Chinese)[3]IMAICHI K, TSUJIMOTO Y, YOSHIDA Y. An analysis of unsteady torque on a two-dimensional radial impeller[J]. Journal of fluids engineering, 1982, 104(2): 228-234.[4]MISKOVISH R S, BRENNEN C E. Some unsteady fluid forces on pump impellers[J]. Journal of fluids enginee-ring, 1992, 114(4):632-637.[5]FLORJANCIC S, FREI A. Dynamic loading on pumps—causes for vibrations[C]//Proceedings of the Tenth International Pump Users Symposium, 1993: 171-184.[6]周林玉. 偏离工况下离心泵的压力脉动和振动分析[J]. 流体机械, 2015, 43(2): 52-55. ZHOU Linyu. Analysis on pressure fluctuation and vibration of a centrifugal pump for off-design conditions[J]. Fluid machinery, 2015, 43(2):52-55.(in Chinese)[7]袁寿其, 衡亚光, 洪锋, 等. 2种隔舌模型对离心泵性能模拟的影响[J]. 排灌机械工程学报, 2013, 31(7): 553-557. YUAN Shouqi, HENG Yaguang, HONG Feng, et al. Influence of two types of cut-water shapes on simulated performance of centrifugal pump[J]. Journal of drainage and irrigation machinery engineering, 2013, 31(7):553-557.(in Chinese)[8]杨敏官, 张宁, 李忠, 等. 基于 CFD 的离心泵侧壁式压水室优化设计[J]. 江苏大学学报(自然科学版), 2013, 34(1): 28-32. YANG Minguan, ZHANG Ning, LI Zhong, et al. Optimal design of centrifugal pump with tilt volute based on CFD[J]. Journal of Jiangsu University(nature science edition), 2013, 34(1):28-32.(in Chinese)[9]付燕霞, 袁寿其,袁建平,等. 离心泵小流量工况下的内部流动特性[J].排灌机械工程学报,2014,32(3):185-190. FU Yanxia, YUAN Shouqi, YUAN Jianping,et al. Internal flow characteristics of centrifugal pump at low flow rates[J]. Journal of drainage and irrigation machinery engineering, 2014, 32(3):185-190.(in Chinese)[10]冒杰云, 袁寿其, 张金凤, 等. 低比转数离心泵驼峰工况附近内部流动特性分析[J]. 排灌机械工程学报, 2015, 33(4): 283-289. MAO Jieyun, YUAN Shouqi, ZHANG Jinfeng, et al. Analysis of inner flow characteristics in low specific speed centrifugal pump around hump conditions[J]. Journal of drainage and irrigation machinery enginee-ring, 2015, 33(4):283-289.(in Chinese)[11]倪福生,刘大恺. 轴流泵桨叶水力矩特性的试验与计算[J].河海大学学报,1988,16(2):62-69. NI Fusheng, LIU Dakai. Calculation and experiment of hydraulic moment in axial pump blades[J]. Journal of Hohai University(natural science),1988,16(2):62-69.(in Chinese)[12]陈红勋,朱兵,魏培茹. 轴流泵叶片调节力的分析与研究[J].水泵技术,2005(5):5-9. CHEN Hongxun, ZHU Bing, WEI Peiru. Research and analysis on the adjustable force in axial pump blades[J]. Pump technology, 2005(5):5-9.(in Chinese)[13]祝磊. 离心泵动静干涉作用大涡模拟和压力脉动试验研究[D]. 镇江:江苏大学, 2011.[14]ASUAJE M, BAKIR F, KOUIDRI S N, et al. Numerical modelization of the flow in centrifugal pump: volute influence in velocity and pressure fields[J]. International journal of rotating machinery, 2005(3):244-255.[15]LUO Y, YUANS, YUAN J, et al. Research on characteristic of the vibration spectral entropy for centrifugal pump[J]. Advances in mechanical engineering, 2014: doi.org/10.1155/2014/698938.
