JAMP  Vol.1 No.6 , November 2013
Effects of Noncircular Inlet on the Flow Structures in Turbulent Jets
Abstract: Turbulent jet flows with noncircular nozzle inlet are investigated by using a Reynolds Stress Model. In order to analyze the effects of noncircular inlet, the cross section of inlet are selected as circular, square, and equilateral triangular shape. The jet half-width, vorticity thickness, and developments of the secondary flow are presented. From the result, it is confirmed that the secondary flows of square and equilateral triangular nozzle are more vigorous than that of the circular jet. This development of secondary flows is closely related to the variations of vortical motions in axial and azimuthal directions.
Cite this paper: Kim, W. and Park, T. (2013) Effects of Noncircular Inlet on the Flow Structures in Turbulent Jets. Journal of Applied Mathematics and Physics, 1, 37-42. doi: 10.4236/jamp.2013.16008.

[1]   J. Mi and G. J. Nathan, “Statistical Properties of Turbulent Free Jets Issuing from Nine Differently-Shaped Nozzles,” Flow, Turbulence and Combustion, Vol. 84, No. 4, 2010, pp. 583-606.

[2]   G. Singh, T. Sundararajan and K. A. Bhaskaran, “Mixing and Entrainment Characteristics of Circular and Noncircular Confined Jets,” Journal of Fluids Engineering, Vol. 125, No. 5, 2003, pp. 835-842.

[3]   C. O. Iyogun and M. Birouk, “Effect of Sudden Expansion on Entrainment and Spreading Rates of a Jet Issuing from Asymmetric Nozzles,” Flow, Turbulence and Combustion, Vol. 82, No. 3, 2009, pp. 287-315.

[4]   N. E. Öçer, G. Tasar, O. Uzol and S. Özgen, “Flow Structure and Turbulence in Near Fields of Circular and Non-circular Jets,” EU-CASS Proceedings Series, Vol. 3, 2012, pp. 41-52.

[5]   R. S. Miller, C. K. Madina and P. Givi, “Numerical Simulation of Non-Circular Jets,” Computers & Fluids, Vol. 24, No. 1, 1995, pp. 1-25.

[6]   A. Huser and S. Biringen, “Direct Numerical Simulation of Turbulent Flow in a Square Duct,” Journal of Fluid Mechanics, Vol. 257, 1993, pp. 65-95.

[7]   R. Pecnik and G. Iaccarino, “Predictions of Turbulent Secondary Flows Using the Model,” AIAA-38th Fluid Dynamics Conference and Exhibit, Seattle, 23-26 June 2008, pp. 1-12.

[8]   B. E. Launder, G. J. Reece and W. Rodi, “Progress in the Development of a Reynolds-Stress Turbulence Closure,” Journal of Fluid Mechanics, Vol. 68, No. 3, 1975, pp. 537-566.

[9]   T. Djeridane, M. Amielh, F.Anselmet and L. Fulachier, “Velocity Turbulence Properties in the Near-Field Region of Axisymmetric Variable Density Jets,” Physics of Fluids, Vol. 8, 1996, pp. 1614-1630.

[10]   B. R. Munson, D. Y. Young and T. H. Okiishi, “Fundamentals of Fluid Mechanics,” 3rd Edition, John Wiley & Sons, 2010.

[11]   ANSYS FLUENT 12.0, “User’s Guide,” 2009.

[12]   C. Bogey and C. Bailly, “Large Eddy Simulations of Transitional Round Jets: Influence of the Reynolds Number on Flow Development and Energy Dissipation,” Physics of Fluids, Vol. 18, No. 6, 2006, pp. 065101-1- 065101-14.