后置灯泡贯流泵压力脉动特性数值模拟  

Numerical simulation of pressure fluctuation in postpositional bulb tubular pump

作　　者：施伟 蔡瑞民 李松柏 孙涛 沈冲 成立[2] 罗灿 SHI Wei;CAI Ruimin;LI Songbai;SUN Tao;SHEN Chong;CHENG Li;LUO Can(The Eastern Route of South-to-North Water Transfer Project Jiangsu Water Source Co.,Ltd.,Nanjing 210029,China;College of Hydraulic Science and Engineering,Yangzhou University,Yangzhou 225009,China;Hongze Lake Water Conservancy Project Management office of Jiangsu Province,Huai'an 223100,China)

机构地区：[1]南水北调东线江苏水源有限责任公司,南京210029 [2]扬州大学水利科学与工程学院,江苏扬州225009 [3]江苏省洪泽湖水利工程管理处,江苏淮安223100

出　　处：《南水北调与水利科技（中英文）》2022年第3期610-618,共9页South-to-North Water Transfers and Water Science & Technology

基　　金：国家自然科学基金项目(51779214);江苏省南水北调科技研发项目(SSY-JS-2020-F-43,SSY-JS-2020-F-45);江苏省水利科技项目(2020030)。

摘　　要：为研究不同工况下某南水北调泵站后置灯泡贯流泵叶轮导叶压力脉动规律,通过计算流体动力学(computational fluid dynamics,CFD)对偏流量、偏水位工况叶轮导叶区压力脉动进行计算与分析,结果表明:叶轮导叶区压力脉动时域图周期性明显,叶轮叶片个数对压力脉动主次频有一定影响,叶轮导叶区主次频均为整倍数叶频,叶轮导叶区压力脉动幅值整体从轮缘到轮毂呈减小趋势,叶轮区的压力脉动幅值明显大于导叶区。非设计水位工况下叶轮导叶区压力脉动幅值略大于设计工况,主次频未发生明显变化;非设计流量工况中小流量工况与大流量工况压力脉动幅值均大于设计工况,各个监测点的小流量工况压力脉动幅值为设计工况的2~3倍,且在此工况下低频脉动明显。可见非设计工况运行对机组压力脉动幅值的影响较大,长期在非设计工况下运行严重影响机组运行效率,泵站运行应尽量避免非设计工况运行的情况。研究结论可为泵站日常运维和研究异常水力振动提参考。Bulb tubular pump is widely used in South-to-North Water Transfer Project because of high efficiency,large flow rate,and excellent hydraulic performance.Abnormal hydraulic resonance could cause when large pumping stations operate under off-design conditions,and the operation of pumping stations could disturbed by abnormal hydraulic resonance.Therefore,it is urgent to study and prevent abnormal hydraulic resonance due pressure fluctuation of impeller and guide vane of postpositional bulb tubular pump in South-to-North Water Transfer pumping station under different working conditions.The pressure fluctuation in the vane area of the impeller under the condition of partial flow and water level was calculated and analyzed by CFD method.To analyze the pressure fluctuation law of impeller and guide vane area in bulb tubular pump,18 pressure fluctuation monitoring points were arranged.The frequency-domain diagram of pressure fluctuation was obtained by fast Fourier transform of time-domain data of pressure fluctuation.The variation characteristics of amplitude and frequency of pressure fluctuation were analyzed by frequency domain diagram of pressure fluctuation.The results showed that the time-domain diagram of pressure fluctuation in the impeller and guide vane was periodical.The primary and secondary frequency of pressure fluctuation was influenced by the number of impeller blades.The primary and secondary frequencies of the impeller and guide vane area were all integral multiples,and the pressure fluctuation amplitude of the impeller and guide vane area was decreased from the rim to the hub.The pressure fluctuation amplitude in the impeller area was significantly greater than that in the guide vane area.Under the partial water level condition,the amplitude of pressure fluctuation in the impeller and guide vane area was slightly larger than that under the design condition,and the primary and secondary frequencies were not changed.The pressure fluctuation amplitude of small and large flow conditions under partial flow

关 键 词：泵站 灯泡贯流泵 压力脉动 数值模拟 快速傅里叶变换 

分 类 号：TV131.4[水利工程—水力学及河流动力学]