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Experimental Studies on Co-flowing Subsonic and Sonic Jets

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Abstract

Effect of an annular co-flow jet on the center jet at subsonic, correctly expanded and underexpanded sonic conditions was studied experimentally. It is found that the co-flow retards the mixing of the primary jet, leading to potential core elongation. The characteristic decay of the jet is also retarded in the presence of co-flow. With co-flow core length elongation of 40% and 80% were achieved for correctly expanded and underexpanded (NPR 7) sonic jets, respectively. Shadowgraph pictures show that the co-flow is effective in preserving the shock-cell structures of the inner jet, making the jet to propagate to a greater axial distance which otherwise would have decayed faster.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Lakireddy Balireddy College of Engineering, Mylavaram, India

    Pinnam Lovaraju

  2. Department of Aerospace Engineering, Indian Institute of Technology Kanpur, Kanpur, India

    E. Rathakrishnan

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  1. Pinnam Lovaraju
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  2. E. Rathakrishnan
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Correspondence to Pinnam Lovaraju.

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Lovaraju, P., Rathakrishnan, E. Experimental Studies on Co-flowing Subsonic and Sonic Jets. Flow Turbulence Combust 87, 115–132 (2011). https://doi.org/10.1007/s10494-011-9332-5

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  • DOI: https://doi.org/10.1007/s10494-011-9332-5

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