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On Turbulent Jets Issuing from Notched-Rectangular and Circular Orifice Plates

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Abstract

This paper reports an experimental investigation of the near-field flow characteristics of two air/air turbulent jets issuing respectively from notched-rectangular and circular orifice plates with identical opening areas or equivalent diameters (D e ). Planar particle image velocimetry (PIV) was used to measure the velocity field at the same Reynolds number, based on D e , of Re = 72,000. Consistent with previous work on other noncircular jets, the present study finds that the notched jet has a higher rate of mixing than does the circular counterpart. In particular, this jet in the very near field transfers its momentum to the surroundings at a greater rate, evidenced by a notably shorter unmixed core and faster turbulence intensity growth. The higher rates of overall decay and spread of the notched jet are maintained over the entire measurement region and likely beyond. In addition, the phenomenon of axis switching is also found to occur in this jet.

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Authors and Affiliations

  1. State Key Laboratory of Turbulence and Complex Systems and Department of Energy and Resources Engineering, College of Engineering, Peking University, Beijing, 100871, China

    Jianchun Mi

  2. Centre for Energy Technology and School of Mechanical Engineering, University of Adelaide, Adelaide, SA, 5005, Australia

    Jianchun Mi, P. Kalt & G. J. Nathan

Authors
  1. Jianchun Mi
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  2. P. Kalt
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  3. G. J. Nathan
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Correspondence to Jianchun Mi.

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Mi, J., Kalt, P. & Nathan, G.J. On Turbulent Jets Issuing from Notched-Rectangular and Circular Orifice Plates. Flow Turbulence Combust 84, 565–582 (2010). https://doi.org/10.1007/s10494-009-9239-6

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  • DOI: https://doi.org/10.1007/s10494-009-9239-6

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