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Numerical Study of Base Drag Reduction Using Locked Vortex Flow Management Technique for Lower Subsonic Regime

Authors: Kailas S. Jagtap, Karthik Sundarraj, Nirmal Kumar, S. Rajnarasimha, Prakash S. Kulkarni

Abstract:

The issue of turbulence base streams and the drag related to it have been of important attention for rockets, missiles, and aircraft. Different techniques are used for base drag reduction. This paper presents the numerical study of numerous drag reduction technique. The base drag or afterbody drag of bluff bodies can be reduced easily using locked vortex drag reduction technique. For bluff bodies having a cylindrical shape, the base drag is much larger compared to streamlined bodies. For such bodies using splitter plates, the vortex can be trapped between the base and the plate, which results in smooth flow. Splitter plate with round and curved corner shapes has influence in drag reduction. In this paper, the comparison is done between single splitter plate as different positions and with the bluff body. Base drag for the speed of 30m/s can be reduced about 20% to 30% by using single splitter plate as compared to the bluff body.

Keywords: Base drag, bluff body, splitter plate, vortex flow, ANSYS, Fluent.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1316596

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References:


[1] W. A. Miar, "Reduction of base drag by boat-tailed afterbodies in low-speed flow," The Aeronautical Quarterly, 1969.
[2] K. Selvakumar and Dr.K.M.Parammasivam, "Experimental investigation on optimisation of aerodynamic characteristics in a hathback model car 3 using vortex generators," in The Eighth Asia-Pacific Conference on Wind Engineering, Chennai, India, 2013.
[3] P. R. Viswanath, "Flow management techniques for base and afterbody drag reduction," The Aeronautical Quarterly, 1995.
[4] N. B. M. &. P. R. Viswanath, "Drag Reduction from circular-Base Afterbodies at High Speeds," (2004).
[5] Y. Jodai, Y. Takahashi and M. I. &. H. Osaka, "The Effects of Splitter Plates on Turbulent Boundary Layer on a Long Flat Plate Near the Trailing Edge," 2008.
[6] W. A. Miar, "The Effect of a Rear-Mounted Disc on the Drag of a Blunt-Based Body of Revolution," The Aeronautical Quarterly, 1965.
[7] J. B. Little and R. Whipkeyt, "Locked Vortex Afterbodies," 1979.
[8] S. D. B. S. M. a. B. K. G. Manish Kumar Chauhan, "Experimental investigation of flow over a square cylinder with an attached splitter plate at intermediate Reynolds number," Journal of Fluids and Structures.