叶轮出口边对双蜗壳泵压力脉动的影响  

Influence of blade trailing edge orientation on pressure fluctuation in double-volute of marine pump

作　　者：操瑞嘉 孔祥序 周以松 孙静如 CAO Ruijia;KONG Xiangxu;ZHOU Yisong;SUN Jingru(National Research Center of Pumps,Jiangsu University,Zhenjiang,Jiangsu 212013,China;China Construction Machinery Co.Ltd.,Beijing 100070,China)

机构地区：[1]江苏大学国家水泵及系统工程技术研究中心,江苏镇江212013 [2]中工工程机械成套有限公司,北京100070

出　　处：《排灌机械工程学报》2020年第1期32-38,共7页Journal of Drainage and Irrigation Machinery Engineering

基　　金：江苏省重点研发计划项目(BE2018085)

摘　　要：泵的叶轮扫掠蜗壳隔舌时产生的压力脉动是引起船用泵振动噪声的原因之一.为尽可能弱化这一影响,分别设计了叶片出口边与前后盖板基本面垂直和倾斜的2种不同形式叶轮,将其配置在相同的双蜗壳中,通过数值计算与样机试验相结合的手段,对蜗壳内9个不同位置的压力脉动情况进行对比分析.结果表明:出口边倾斜的叶轮相比于出口边垂直的叶轮可明显改善蜗壳内次脉动的“驼峰”现象,且可以进一步降低隔舌处主波动的压力峰值;对蜗壳内2个隔舌稍前的位置,出口边倾斜的叶轮反而会使得该点的压力系数幅值明显增大,且该点主波动的周期数发生改变;2种叶轮出口边的不同形式对蜗壳出口位置的压力脉动的影响基本相同;采用出口边倾斜叶轮对改善因叶轮与隔舌间的液流压力脉动是可行的.Fluid pressure fluctuation induced by a rotating impeller when sweeping the tongue of volute is one chief reason for vibration and noise in marine pumps.To reduce the pressure fluctuation,two types of impellers were designed,one with tilted blade trailing edge with respect to the hub surface,the other with blade trailing edge perpendicular to the hub surface,and then involved in the identical double-volute of a prototype centrifugal pump.The pressure fluctuations at nine monitoring points within the volute were analyzed in detail by carrying out experiments and numerical simulations.The simulated results indicate that the tilted blade trailing edge could eliminate the pressure fluctuation in the volute at high frequencies and could reduce the fluctuation amplitude at blade passing frequency further.However,the pressure coefficient at monitoring points b and e,which are located in the fourth cross-sections of the volute,is intensified.Additionally,the frequencies for the peak amplitudes are different from those with blade trailing edge perpendicular to the hub surface.Two kinds of blade trailing edge have a similar effect on the pressure fluctuation at the volute outlet.Thus,a tilted blade trailing edge with respect to the hub surface can reduce the pressure fluctuation in the volute due to impeller-tongue interaction effectively.

关 键 词：船用泵 减振降噪 主次脉动 压力脉动 

分 类 号：S277.9[农业科学—农业水土工程] TH311[农业科学—农业工程]