Co-rotating equal strength vortex pair merging in channel flow with pressure gradient environment

DOI

10.2991/iceep-17.2017.159How to use a DOI?

Keywords

vortex merger, channel flow, pressure gradient

Abstract

Experiments were conducted in order to understand the merging process of co-rotating equal strength vortex pair in channel flow with different pressure gradient environment. Cross-flow velocity measurements were performed at a series of downstream locations under zero, favorable and adverse pressure gradient conditions. The main finding is that the pressure gradient has a vastly effect on the merging process. As the merging environment changed from favorable pressure gradient (FPG) to adverse pressure gradient (APG), the increasing of the vortex spacing was observed in the first diffusive stage, which lead to a delayed convective stage. However, at the convective stage where the spacing of vortex pair center decreased, the decreasing process gradually speed up from FPG to APG accompanied with a faster vortices transportation and diffusion process so the merging process is accordingly accelerated. On the other hand, the vortex orientation difference was not as conspicuous as the vortex center separation distance.

Copyright

© 2017, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

Download article (PDF)

TY  - CONF
AU  - Yuan Yi
AU  - Peiqing Liu
AU  - Tianxiang Hu
PY  - 2017/06
DA  - 2017/06
TI  - Co-rotating equal strength vortex pair merging in channel flow with pressure gradient environment
BT  - Proceedings of the 2017 6th International Conference on Energy and Environmental Protection (ICEEP 2017)
PB  - Atlantis Press
SP  - 918
EP  - 926
SN  - 2352-5401
UR  - https://doi.org/10.2991/iceep-17.2017.159
DO  - 10.2991/iceep-17.2017.159
ID  - Yi2017/06
ER  -