叶片交错布置不同角度对双吸离心泵蜗壳内压力脉动的影响  

Influence of blade staggering disposition with different angles on pressure pulsation in volute of double-suction centrifugal pump

作　　者：赵万勇[1] 薛亚丽[1] 葛靖国[1] 颜韶华 

机构地区：[1]兰州理工大学能源与动力工程学院,甘肃兰州730050

出　　处：《兰州理工大学学报》2016年第1期56-60,共5页Journal of Lanzhou University of Technology

基　　金：甘肃省教育厅研究生导师科研项目(0503-04)

摘　　要：双吸离心泵内部流场压力脉动是影响水泵机组运行稳定性的关键因素,为了研究双吸离心泵叶轮两侧叶片交错布置对泵蜗壳内压力脉动的影响,以某双吸离心泵为研究对象,将其两侧叶片分别交错布置15°和30°,在蜗壳的不同位置设置监测点,利用CFD技术对离心泵内部流场在设计工况下进行三维非定常数值模拟,得到监测点处的压力脉动情况,并对其进行时域与频域分析.结果表明,该泵蜗壳内的压力脉动主要以轴频和叶频为主,相对于原模型泵叶轮,将叶片交错布置可以有效改善蜗壳内的压力脉动情况,且将叶片错开30°减弱蜗壳内压力脉动的效果比错开15°更好.The pressure pulsation in internal flow field of double-suction centrifugal pumps is the key fac- tor affecting their operational stability. In order to investigate the influence of staggering disposition of blades on two sides of impeller on the pressure pulsation in pump volute, a double-suction centrifugal pump was taken as investigation object, the blades on both sides of the impeller were staggered by 15 ° and 30 °, and s set of monitoring stations was placed at various positions in pump volute. The CFD technique was used to numerically simulate the nonstationary three-dimensional internal flow field in centrifugal pump on the design condition. The pressure pulsation at the monitoring points was gotten and analyzed in time-domain and frequency domain. The result showed that the pressure pulsation will basically take the form of blade frequency and shaft frequency. Compared with the original model of the pump impeller, the impeller with stagger-disposed blades on its two sides can effectively improve the pressure pulsation inside the volute,and staggering blades with 30° will improve the volute pressure pulsation better than staggering with 15°.

关 键 词：双吸离心泵 数值模拟 压力脉动 时域 频域 

分 类 号：TH311[机械工程—机械制造及自动化]