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International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.5

ISSN Druckformat: 2152-5102
ISSN Online: 2152-5110

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International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v39.i4.40
pages 325-347

Experimental Analysis of Non Circular Co-Flow in the Incompressible Coaxial Jets

Ponnambalam Manivannan
Department of Aeronautical Engg, Hindustan College of Engineering Chennai, India
B. T. N. Sridhar
Department of Aerospace Engineering in MIT, Anna University Chennai, India


This paper analyses an alternative paradigm for 'incompressible coaxial jet' from the conventional mode of circular coaxial jet. The experimental analysis of incompressible co-axial jet has been presented. The characteristics of non-circular co-flow jets have been analysed for different shapes of nozzles, i. e. circular, hexagon and cruci-form and with various velocity ratio (Ui /Uo) like 0.7, 1.0 and 1.4. The flow field characteristics like centerline velocity, spreading rate, potential core length and turbulent characteristics have been determined experimentally through hotwire anemometer measuring technique. The inner potential core length is dependent upon the velocity ratio and the outer potential core length is dependent on the co-flow shapes. It was found that the centerline velocity decay of circular co-flow jet was relatively less than the non-circular co-flow jet. Coaxial jets with the velocity ratio less than unity develop faster than that velocity ratio greater than unity. The velocity ratio less than unity is to enhance the rapid mixing between the two streams when compared to the velocity ratio more than unity. The turbulence intensity of non-circular co-flow jet was more than the circular co-flow jet.