The Open Fuels & Energy Science Journal

2016, 9 : 37-46
Published online 2016 September 21. DOI: 10.2174/1876973X01609010037
Publisher ID: TOEFJ-9-37

RESEARCH ARTICLE
 Flow Characteristics of a Low Reynolds Number Jet in Crossflow with an Obstacle Block

Jianlong Chang1,3, * , Xudong Shao2 , Xiao Hu3 and Shuangbiao Zhang3

* Address correspondence to this author at the College of Mechatronic Engineering, North University of China, Taiyuan, Shanxi, 10081, ; Tel: +86-13811 113133; E-mail: changjianlong1989@126.com

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.