蜗壳式多级泵首级叶轮切割压力脉动特性  

Pressure fluctuation in multistage volute pump with the first stage impeller trimmed

作　　者：石海峡 杨亚飞 李跃 许巍 SHI Haixia;YANG Yafei;LI Yue;XU Wei(School of Mechanical Engineering,Hefei University of Technology,Hefei,Anhui 230009,China;School of Automotive and Traffic Engineering,Hefei University of Technology,Hefei,Anhui 230009,China)

机构地区：[1]合肥工业大学机械工程学院,安徽合肥230009 [2]合肥工业大学汽车与交通工程学院,安徽合肥230009

出　　处：《排灌机械工程学报》2019年第1期7-12,共6页Journal of Drainage and Irrigation Machinery Engineering

基　　金：中央高校基本科研业务费专项资金资助项目(JZ2015HGBZ0128;JD2016JGPY0006)

摘　　要：为了研究双吸叶轮切割对双蜗壳内压力脉动的影响,选取蜗壳式多级泵首级叶轮为研究对象,基于N-S方程,采用RNG k-ε湍流模型,对首级双吸叶轮在不同叶轮切割工况下进行定常和非定常数值计算.分别选择4种切割方式以及6种切割量,得到不同切割工况下隔舌与出口点的压力脉动时域和频谱图.计算结果表明:不同叶轮切割量对双蜗壳隔舌附近压力变化影响较大,压力变化幅度随切割量的增大先减小后增大,切割量为0.98时,压力波动最小;不同切割方式在一定程度可以改善蜗壳隔舌附近的压力波动,V切和正斜切时压力波动优于正切和反斜切,且反斜切较优于正切压力;对于蜗壳出口点,不同叶轮切割量下,随着切割量的增大,压力脉动依次降低,而不同切割方式影响较小.In order to study effects of trimmed double suction impeller on pressure pulsation in a double volute case,the first stage of a multistage volute pump was selected as a study object,steady and unsteady fluid flow simulations in the pump were performed based on the N-S equations and RNG k-ε turbulence model when the first stage double suction impeller was trimmed under different conditions,such as six trimmed quantities and four trimming patterns. Pressure fluctuations in time and frequency domains at monitoring points near the tongue and at the volute outlet were obtained. The results show that impeller trimmed quantity has a greater influence on the pressure change near the tongue of double volute case,and the pressure variation amplitude decreases firstly and then increases with increasing trimmed quantity,especially the pressure fluctuation is the smallest when the quantity is 0.98.Some trimming patterns can reduce the pressure fluctuation near the tongue in some degree,the pres-sure fluctuations under V cut and forward skew cut are smaller than those under the straight cut and backward skew cut,and the change in performance with backward skew cut is little smaller than that with straight cut. At the volute outlet point,the pressure fluctuation is decreased with increasing trimmed quantity,but is less affected by the trimming patterns.

关 键 词：蜗壳式多级泵 叶轮切割 双蜗壳 压力脉动 频谱分析 

分 类 号：TH311[机械工程—机械制造及自动化] S277.9[农业科学—农业水土工程]