Mini-Jet Controlled Turbulent Round Air Jet
1 Department of Energy & Resources Engineering, College of Engineering, Peking University, Beijing 100871
2 Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong
3 Key Laboratory of Manufacture and Test Techniques for Automobile Parts, Chongqing University of Technology, Chongqing 400054
Received Date:
June 14, 2011
Published Date:
November 30, 2011
Abstract
We report an investigation of the active control of a round air jet by multiple radial blowing mini-jets. The Reynolds number based on the jet exit velocity and diameter is 8000. It is found that once the continuous mini-jets are replaced with pulsed ones, the centerline velocity decay rate K can be greatly increased as the pulsing frequency of mini−jets approaches the natural vortex frequency of the main jet. For example, the K value is amplified by more than 50% with two (or four) pulsed mini-jets blowing, compared with the continuous mini-jets at the same ratio of the mass flow rate of the mini-jets to that of the main jet.
Article Text
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About This Article
Cite this article:
DU Cheng, MI Jian-Chun, ZHOU Yu, ZHAN Jie. Mini-Jet Controlled Turbulent Round Air Jet[J].
Chin. Phys. Lett. , 2011, 28(12): 124703.
DOI: 10.1088/0256-307X/28/12/124703
DU Cheng, MI Jian-Chun, ZHOU Yu, ZHAN Jie. Mini-Jet Controlled Turbulent Round Air Jet[J]. Chin. Phys. Lett. , 2011, 28(12): 124703. DOI: 10.1088/0256-307X/28/12/124703