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International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.9

ISSN Print: 2152-5102
ISSN Online: 2152-5110

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International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v26.i1.30
pages 36-48

Passive Control of Circular Jet Spread-Rates with Axially Splined Nozzles

A. A. S. Arefin Kabir
Department of Mechanical Engineering, University of South Carolina, Columbia, SC 29208
Sandip Dutta
Department of Mechanical Engineering, University of South Carolina Columbia, SC 29208
M. A. Taher Ali
Mechanical Engineering Department, Bangladesh University of Engineering and Technology, Dhaka-1000, Bangladesh

ABSTRACT

Experimental measurements for the axial development of streamwise velocity and turbulence distributions in the near field of free circular jets issued from splined nozzles are presented. Results include the axial distribution of mean flow and turbulence related quantities of a free circular jet with different nozzle exit conditions. Hot-wire data reveal interesting characteristics on jet spread-rate, shear layer width, and momentum thickness. Observed jet-characteristics are explained on the basis of the velocity and turbulence profiles measured at the nozzle exit. Axial splines at the circumference of the jet nozzle enhance turbulence at the jet circumference boundary layer without significantly changing the nozzle core flow. The boundary layer at the splined jet nozzle exit, i.e., at the start of the free shear layer, increases in thickness due to an increase in turbulence mixing. The addition of splines reduces the jet spread-rate and the growth of shear layer width. It is also observed that splines cause turbulence suppression at downstream locations and this method can be used as a passive control of jets.


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