科创中国

原文链接：万方

• 摘要：

  The transient behavior of centrifugal pumps during transient operating periods,such as startup and stopping,has drawn more and more attention recently because of urgent needs in engineering.Up to now,almost all the existing studies on this behavior are limited to using water as working fluid.The study on the transient behavior related to solid-liquid two-phase flow has not been seen yet.In order to explore the transient characteristics of a high specific-speed centrifugal pump during startup period delivering the pure water and solid-liquid two-phase flow,the transient flows inside the pump are numerically simulated using the dynamic mesh method.The variable rotational speed and flow rate with time obtained from experiment are best fitted as the function of time,and are written into computational fluid dynamics(CFD)code-FLUENT by using a user defined function.The predicted heads are compared with experimental results when pumping pure water.The results show that the difference in the transient performance during startup period is very obvious between water and solid-liquid two-phase flow during the later stage of startup process.Moreover,the time for the solid-liquid two-phase flow to achieve a stable condition is longer than that for water.The solid-liquid two-phase flow results in a higher impeller shaft power,a larger dynamic reaction force,a more violent fluctuation in pressure and a reduced stable pressure rise comparing with water.The research may be useful to understanding on the transient behavior of a centrifugal pump under a solid-liquid two-phase flow during startup period.

• 关键词：

  centrifugal pump solid-liquid two-phase flow startup transient performance

• 作者单位：

  The State Key Lab of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, China ;College of Mechanical Engineering, Quzhou University, Quzhou 324000, China%The Province Key Lab of Fluid Transmission Technology, Zhejiang Sci-Tech University, Hangzhou 310018, China%The State Key Lab of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, China ;The Province Key Lab of Fluid Transmission Technology, Zhejiang Sci-Tech University, Hangzhou 310018, China

• 基金项目：

  National Natural Science Foundation of China(Grant .51076144,51276172)%Zhejiang Provincial Natural Science Foundation of China(Grant .R1100530,LY12E06002)%National Basic Research Program of China(973Program,Grant2009CB724303)

• 来源期刊：

  中国机械工程学报

• 年，卷(期)：

  201427001