基于FLUENT的单-双涡室离心泵径向力分析  

Analysis of radial forces in centrifugal pump with single and double volute based on FLUENT

作　　者：刘建瑞[1] 徐永刚[1] 苏起钦[1] 王董梅[1] 

机构地区：[1]江苏大学流体机械工程技术研究中心,江苏镇江212013

出　　处：《排灌机械》2009年第2期83-86,共4页Drainage and Irrigation Machinery

基　　金：国家科技支撑计划项目(2008BAF34B10)

摘　　要：以某电厂3715L型脱硫泵为模型,应用商业软件FLUENT,采用标准k-ε湍流模型和SIMPLEC算法,对单-双涡室离心泵内部流场进行模拟,分析了这两种泵静压力和速度场的分布规律,并对径向力进行了计算分析.通过对比分析发现,单涡室离心泵在非设计工况点时隔舌两侧区域出现较大压差,作用于叶轮产生径向力,小流量时叶轮出口出现不对称的高速流体;双涡室结构能够有效地改善非设计工况点时压水室能量的转化,小流量时叶轮出口的高速液体呈对称分布,从而降低了压水室压差,起到了平衡径向力的作用;通过计算发现,偏离工况点时双涡室结构设计能有效地减小径向力.数值模拟的结果与现有理论的基本吻合,实际运行情况稳定,可以为更好地认识和设计双涡室离心泵提供依据.With commercial software FLUENT, two equations standard k -ε turbulence model and SIMPLEC algorithm were adopted to simulate the internal flow-field of a centrifugal pump with single and double volutes. The distribution laws of static pressure field and velocity field were analyzed, and the radial forces were calculated by empirical formula. The comparing analysis indicates that centrifugal pump with single volute may have large pressure difference, which acts on impeller to produce radial forces, in both sides of tongue tip at off-design conditions. Some high speed unsymmetrical flows appear on impeller exit at low flow rates. While centrifugal pump with double volute can effectively improve the energy conversion in volute at off-design conditions, and the flows at low flow rates are more symmetrical, which can reduce the pressure difference and to balance the radical forces. The calculating result indicates that, the design can reduce the radial forces effectively at off-design conditions, the results of numerical simulation can basicly match with existing theory, and also offer some basis for better understanding the double volute pump.

关 键 词：离心泵 单涡室 双涡室 径向力 数值模拟 

分 类 号：TH311[机械工程—机械制造及自动化]