Effect of pitched short blades on the flow characteristics in a stirred tank with long-short blades impeller

作     者：Yongjun Wu Pan You Peicheng Luo Yongjun Wu;Pan You;Peicheng Luo

作者机构：School of Chemistry and Chemical EngineeringSoutheast UniversityNanjing 211189China 

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

年 卷 期：2022年第35卷第5期

页      面：143-152页

核心收录：

学科分类：080704[工学-流体机械及工程] 08[工学] 0807[工学-动力工程及工程热物理] 

基　　金：financial support from the National Natural Science Foundation of China (22078058) 

主　　题：Stirred tank Computational fluid dynamics(CFD) Turbulent flow Long-short blades(LSB)impeller Pitched blades 

摘      要：This work focuses on the design improvement of the long-short blades(LSB)impeller by using pitched short blades(SBs)to regulate the flow field in the stirred *** mesh size evaluation and velocity field validation by the particle image velocimetry,large eddy simulation method coupled with sliding mesh approach was used to study the effect of the pitched SBs on the flow *** changed the inclined angles of the SBs from 30°to 60°and compared the flow characteristics when the impeller was operated in the down-pumping and up-pumping *** the case of down-pumping mode,the power number is relatively smaller and vortexes below the SBs are suppressed,leading to turbulence intensification in the bottom of the *** in the case of up-pumping mode,the axial flow rate in the center increased significantly with bigger power number,resulting in more efficient mass exchange between the axial and radial flows in the whole *** LSB with 45°inclined angle of the SBs in the up-pumping mode has the most uniform distributions of flow field and turbulent kinetic energy compared with other impeller configurations.