Turbulence characteristics of a round offset jet with different offset ratios in a counterflow
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作者
Zhiwei Li, Wenxin Huai
发表日期
2019/9/27
期刊
Environmental Fluid Mechanics
页码范围
1-18
出版商
Springer Netherlands
简介
A round jet entering a counterflow with different jet-to-current velocity ratios and different offset ratios was experimentally investigated using particle image velocimetry. Turbulence characteristics, including axial and radial turbulence intensity, Reynolds stress, and skewness in the radial direction, were analyzed based on the measured data. When a round free jet enters a counterflow, the axial or radial turbulence intensity increases to a maximum value rapidly after the jet exit and then generally decreases to a small value. Near the stagnation point, the axial turbulence intensity reaches a second local maximum value, while radial turbulence intensity does not appear the second local maximum value. The ratio of axial to radial turbulence intensity is 0.5 inside the penetration length. The axial and radial turbulence intensities do not present self-similarity in the radial direction. The skewness is negative on the …