Chin. Phys. Lett.  2011, Vol. 28 Issue (12): 124703    DOI: 10.1088/0256-307X/28/12/124703
FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
Mini-Jet Controlled Turbulent Round Air Jet
DU Cheng1,2, MI Jian-Chun1**, ZHOU Yu2, ZHAN Jie3
1Department of Energy & Resources Engineering, College of Engineering, Peking University, Beijing 100871
2Department 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
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DU Cheng, MI Jian-Chun, ZHOU Yu et al  2011 Chin. Phys. Lett. 28 124703
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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.
Keywords: 47.27.Wg      47.27.De     
Received: 15 June 2011      Published: 29 November 2011
PACS:  47.27.wg (Turbulent jets)  
  47.27.De (Coherent structures)  
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https://cpl.iphy.ac.cn/10.1088/0256-307X/28/12/124703       OR      https://cpl.iphy.ac.cn/Y2011/V28/I12/124703
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DU Cheng
MI Jian-Chun
ZHOU Yu
ZHAN Jie
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