离心泵流量突增过程瞬态流动研究  

STUDY OF TRANSIENT FLOW IN CENTRIFUGAL PUMP DURING FLOW IMPULSIVELY INCREASE PROCESS

作　　者：武鹏[1] 吴大转[1] 李志峰[1] 王乐勤[1] 

机构地区：[1]浙江大学化工机械研究所,浙江杭州310027

出　　处：《工程热物理学报》2010年第3期419-422,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.50906074);国家自然科学基金项目(No.50776077)

摘　　要：为研究离心泵流量突增过程所表现的外部瞬态水力特性及其内部流动机理,对离心泵在管路阀门突然开启条件下的特性进行数值模拟和实验研究。测试了不同稳定流量下的离心泵外特性和内流场,验证了稳态工况下的仿真结果。在稳态实验与仿真的基础上,利用分离涡模型(DES)对离心泵流量突增过程的流场进行了数值模拟研究。结果表明,流量突增的瞬态过程的流量-扬程曲线明显偏离稳态值,其主要原因是流量变化引起的流体加速效应及泵内的旋涡结构的不断演化。To study the external transient hydrodynamic performance and the internal flow mechanism of centrifugal pump caused by flow impulsively increase, numerical simulation and experiment was implemented for the pump characteristics during the discharge valve rapid opening. External and internal characteristics under different steady flow conditions were measured, and the simulation results were compared and verified by test results. Based on the experiment and simulation of steady-state performance, detached eddy simulation （DES） was used to explored the transient characteristics of the flow impulsively increase process. The result shows that during the flow impulsively increase process, Q-H curve apparent deviated from the steady-state value, which is caused by the fluid acceleration and the vortex structure evolution during the transient operation.

关 键 词：离心泵 流量突增 分离涡模型 数值模拟 

分 类 号：TH311[机械工程—机械制造及自动化]