文献类型：期刊文献

英文题名：Oscillation induced by vortex ring shedding in a cross-shaped channel

作者：Zhang, Wei[1];Shi, Zhehang[2];Xu, Xudong[1];Li, Weifeng[1];Liu, Haifeng[1];Wang, Fuchen[1]

机构：[1]East China Univ Sci & Technol, Engn Res Ctr Coal Gasificat, Shanghai 200237, Peoples R China;[2]Shanghai Engn Res Ctr Space Engine, Shanghai Inst Space Prop, Shanghai 201112, Peoples R China

年份：2021

卷号：242

外文期刊名：CHEMICAL ENGINEERING SCIENCE

收录：;EI(收录号：20212310452847);WOS:【SCI-EXPANDED(收录号:WOS:000662595700007)】；

基金：This study was supported by the National Natural Science Foundation of China (21776072).

语种：英文

外文关键词：Cross-shaped channel; Oscillation; Residence time; Vortex breakdown; PLIF

摘要：Flow regimes in a cross-shaped channel are studied by Planar Laser Induced Fluorescence at 30 < Re < 350, and a segregated flow, a steady engulfment flow and an unsteady engulfment flow occur in turns with increasing Re. Specially, in the transition regime between steady and unsteady engulfment flow at 230 < Re < 300, an oscillation characterized by periodic shedding of the vortex ring is identified. Unlike the steady engulfment flow, the center vortex will break into two co-rotating vortices downstream for the vortex shedding oscillation. The fluid residence time in the cross-shaped channel is quantitively assessed. The formation of recirculation regions leads to the increase of the fluid residence time at Rer,-110, while the fluid residence time is dramatically reduced at Re > 230 due to the shedding of vortex ring. Simulation results reveal that the oscillation is non-axisymmetric and the vortex ring is periodically generated from recirculation regions and propagated downstream, which is ascribed to vortex breakdown. (c) 2021 Elsevier Ltd. All rights reserved.