Flow Characteristics of a Low Reynolds Number Jet in Crossflow with an Obstacle Block
Jianlong Chang1, 3, *, Xudong Shao2, Xiao Hu3, Shuangbiao Zhang3
1 College of Mechatronic Engineering, North University of China, Taiyuan, Shanxi, China
2 Beijing Institute of Space Systems Engineering, Beijing, China
3 School of Aerospace Engineering, Beijing Institute of Technology, Beijing, China
Abstract
The jet in crossflow at very low Reynolds number (Re=100) with and without block is performed by means of large eddy simulation for the jet-to-crossflow velocity ratios (r) ranging from 1 to 3, and the corresponding flow characteristics are compared. The results show that the time-averaged particle trajectories of the jet are slightly changed if a block is presented, and the mixed vortices are weakened. The existence of the block also can accelerate the formation of stable counter-rotating vortex pair. At lower velocity ratio (r=1), the block has little effect on the jet in crossflow with a symmetrically positive and negative kidney shaped vortices. As the velocity ratio increases, the effect of block not only can generate an asymmetry of positive and negative kidney shaped vortices, but also it can reinforce the interaction between the positive and negative vortices in the jet in crossflow. The effect of block on the temperature field is also analyzed in detail.
Keywords: Block, Jet in crossflow, Large eddy simulation, Vortex.
Article Information
Article History:
Received Date: 11/3/2016
Revision Received Date: 08/08/2016
Acceptance Date: 16/08/2016
Electronic publication date: 21/09/2016
Collection year: 2016
© Chang et al.; Licensee Bentham Open
open-access license:
This is an open access article licensed under the terms of the Creative Commons Attribution-Non-Commercial 4.0 International Public License (CC BY-NC 4.0)
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*
Address correspondence to this author at the College of Mechatronic Engineering, North University of China, Taiyuan, Shanxi, 10081, China; Tel: +86-13811 113133; E-mail: changjianlong1989@126.com
Open Peer Review Details |
Manuscript submitted on 11-3-2016 |
Original Manuscript |
Flow Characteristics of a Low Reynolds Number Jet in Crossflow with an Obstacle Block |