摘要
【目的】研究多工况下隔舌安放角对中比转速离心泵非定常性能的影响。【方法】对5种不同隔舌安放角的离心泵模型进行了在0.8 Qd、1.0 Qd、1.2 Qd工况下的定常与非定常的数值模拟,得到离心泵的外特性曲线以及蜗壳隔舌、出口处的压力脉动情况,并对其进行了频域分析。【结果】存在一个最佳的隔舌安放角使离心泵在设计工况下效率最佳,且最佳效率点向大流量点偏移。随着隔舌安放角的增大,隔舌和出口处的压力变大,流道内的流线更加平顺光滑。各监测点的压力脉动具有明显的周期性,压力系数随流量的增大而增大,随隔舌安放角的增大而减小。不同工况时,隔舌处的压力脉动幅值随隔舌安放角的增大呈先减小再增大的趋势,在28°时达到最小值;出口处的压力脉动幅值随隔舌安放角的增大而减小。【结论】适当的增大离心泵的隔舌安放角有利于减小离心泵的压力脉动,提高其性能。
【Objective】This paper is to study the effect of the angle of the separated tongue on dynamic and static interference of centrifugal pump with intermediate ratio rotation under multiple working conditions.【Method】Steady and unsteady flow at five centrifugal-compression-angle setting in a centrifugal pump was numerically simulated at 0.8 Qd, 1.0 Qd, and 1.2 Qd. The characteristics of the internal flow in the centrifugal pump and the pressure fluctuation at the outlet and the tongue was obtained; the frequency domain of the fluctuation was also analyzed.【Result】An optimal angle of the tongues existed to make the centrifugal pump most efficient, and it shifted toward the point with large flow rate. With an increase in the angle of the partition tongue, the pressure at the partition tongue and the outlet increased as well, while the flow lines in the flow path became smoother. The pressure fluctuation at each monitoring point change periodically. The pressure coefficient increased with flow rate, but decreased as the angle of the tongue increased. Under different working conditions, the amplitude of the pressure fluctuation at the septum decreased first and then increased as the angle of the splayed tongue increased,reaching minimum at angle of 28°. The amplitude of the pressure fluctuation at the outlet varied, increasing as the angle decreased.【Conclusion】An appropriate increase in the angle of the separator tongue in the centrifugal pump is beneficial to reducing the pressure fluctuation and improving the pump performance.
作者
万伦
宋文武
符杰
石建伟
虞佳颖
WAN Lun;SONG Wenwu;FU Jie;SHI Jianwei;YU Jiayin(School of Energy and Power Engineering,Xihua University,Chengdu 610039,China)
出处
《灌溉排水学报》
CSCD
北大核心
2018年第9期84-90,共7页
Journal of Irrigation and Drainage
基金
国家自然科学基金项目(51678508)
四川省科技厅项目(2016JY0187)
四川省教育厅重大培育项目(14CZ0013)
西华大学研究生创新基金项目(ycjj2018035)
关键词
隔舌安放角
多工况
中比转速
离心泵
压力脉动
angle of volute tongue
multiple operating conditions
medium speed
centrifugal pump
pressure pulsation
