Effects of the Blade Shape on the Trailing Vortices in Liquid Flow Generated by Disc Turbines

作     者：赵静 高正明 包雨云 ZHAO Jing;GAO Zhengming;BAO Yuyun

作者机构：State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology Beijing 100029 China 

基　　金：Supported by the National Natural Science Foundation of China(20776008 20821004 20990224) the National Basic Research Program of China(2007CB714300) 

出 版 物：《Chinese Journal of Chemical Engineering》 (中国化学工程学报（英文版）)

年 卷 期：2011年第19卷第2期

页      码：232-242页

摘      要：Particle image velocimetry technique was used to analyze the trailing vortices and elucidate their rela-tionship with turbulence properties in a stirred tank of 0.48 m diameter,agitated by four different disc turbines,in-cluding Rushton turbine,concaved blade disk turbine,half elliptical blade disk turbine,and parabolic blade disk ***-averaged and phase-resolved flow fields near the impeller blades were measured and the structure of trailing vortices was studied in *** location,size and strength of vortices were determined by the simplified λ2-criterion and the results showed that the blade shape had great effect on the trailing vortex *** larger curvature resulted in longer residence time of the vortex at the impeller tip,bigger distance between the upper and lower vortices and longer vortex life,also leads to smaller and stronger *** addition,the turbulent ki-netic energy and turbulent energy dissipation in the discharge flow were determined and *** turbulent kinetic energy and turbulent energy dissipation regions were located between the upper and lower vortices and moved along with *** restricted to single phase flow,the presented results are essential for reliable de-sign and scale-up of stirred tank with disc turbines.

主 题 词：trailing vortices disc turbine particle image velocimetry blade shape 

学科分类：080706[080706] 080703[080703] 080704[080704] 08[工学] 0807[工学-电子信息类] 

核心收录：

D　O　I：10.1016/S1004-9541(11)60160-2

馆 藏 号：203472505...