Green Pump Development Based on the Analysis of Unsteady Flow
(0) Centrifugal pump is a kind of important industrial installation for fluid delivery.Theresearch on the unsteady flow in centrifugal pump is very meaningful to reducing vibration.Particleimage velocimetry (PIV) system and test pump designed for PIV measurement were introduced.Theexperimental scheme and the methods of numerical simulation were discussed.PIV technique wasused to measure the unsteady velocity field near the volute tongue under the mode of externalsynchronization.The unsteady pressure field was simulated by using Sliding Mesh (SM) modelprovided by Fluent.The results show that the velocity and pressure fluctuate periodically with therotation of impeller.Partial fluid flows back to the impeller passage and the velocity in the inlet ofdiffusion tube decreases significantly due to shunt effect of the volute tongue.On the section VIII,themagnitude and fluctuation range of velocity show a decreasing trend in radial direction.Thefluctuation of circumferential velocity is related to the position of high-speed flow in impellerpassage,and the fluctuation of radial velocity is influenced by blade interference and Coriolis force.The static pressure increases and the dynamic pressure decreases in the radial direction of volute.Thevelocity and the pressure on the section VIII and the outlet total pressure fluctuate intensively whenthe blade tail end passes the section VIII and the volute tongue.The vibration of pump can be reducedby increasing the volute tongue mounting angle and decreasing the blade outlet mounting angleproperly.
green pump unsteady flow particle image velocimetry (PIV) numerical simulation
C.L.Shao B.Q.Gu Y.Chen
College of Mechanical and Power Engineering,Nanjing University of Technology,210009 Nanjing,China
国际会议
成都
英文
2008-08-04（万方平台首次上网日期，不代表论文的发表时间）