双流道泵内瞬态动力学特性  

Unsteady dynamics in double channel pumps

作　　者：谈明高[1] 廉益超 吴贤芳[2] 丁荣[1] 陈昆 

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]江苏大学能源与动力工程学院,江苏镇江212013 [3]宁波巨神制泵实业有限公司,浙江宁波315135

出　　处：《排灌机械工程学报》2017年第12期1024-1029,共6页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学基金资助项目(51579117;51509109);江苏省自然科学基金资助项目(BK20161350);江苏高校优势学科建设工程资助项目;江苏省重点研发计划项目(BE2015001-1)

摘　　要：为研究双流道泵输送固液两相流时瞬态动力学特性,基于Mixture多相流模型和拓展的标准k-ε湍流模型对泵内流进行了非定常数值计算,研究了隔舌附近间隙流道内压力脉动及外径对叶轮径向力的影响,并对D_2=101,103,105 mm时能量性能进行了试验验证.研究结果表明,在清水及两相流设计工况下,间隙流道内各监测点处压力脉动主频均为叶频,且颗粒加入后各监测点处压力脉动强度均有不同程度减弱且最大减弱了25.86%.输送固液两相流时,D_2=105mm和D_2=101 mm时设计工况和小流量下叶轮径向力的分布与变化具有一定的规律性,大流量工况时各D_2下的规律均比较明显;随着流量的增大,叶轮径向力矢量中心均从蜗壳断面8向断面4移动,且不受D_2的影响.In order to research the unsteady dynamics in double channel sewage pumps when it transports the solid-liquid two-phase flow,the inner flow double channel sewage pump was numerically simulated by using the mixture multiphase flow model and the developed standard k-ε turbulence model.The pressure fluctuation in the gap flow channel and the impeller radial force under different impeller diameter D2,namely 101,103 and 105 mm,were studied.The simulation results agree well with the experimental ones,which indicate that the numerical calculation methods can be used to predict the transient dynamics in this pump.The results show that the dominant frequency of pressure pulsation at monitoring points in gap flow channel is the blade passing frequency before and after adding a moderate amount of particles.The pressure fluctuation intensity at each monitoring point was weakened with particle addition and the maximum reduction was 25.86%.When the pump transports the solid-liquid two-phase flow and the diameter is 105 mm or 101 mm,the distribution and change of impellerradial force are more regular under designed and operation at a small flow rate.When the flow rate of two-phase flow is larger than the design flow rate,the distribution and change of impeller radial force are regular under all diameters.As the flow rate of two-phase flow increases,the vector center of impeller radial force moves from the eighth section to the fourth section of volute and the impeller diameter has little effect on it.

关 键 词：双流道污水泵 固液两相流 压力脉动 径向力 

分 类 号：S277.9[农业科学—农业水土工程]