Evaluation of drag reduction by turbulence control devices 13; 13;

Yajnik, KS and Sundaram, S and Sivaram, R (1988) Evaluation of drag reduction by turbulence control devices 13; 13;. In: IUTAM Symposium on turbulence management and relaminarisation, 13-23 Jan 1987, Bangalore, India.

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Abstract

A method is given for determining the drag reduction achieved by a given passive turbulence-control device located within the turbulent boundary layer on the surface for which the drag is to be reduced for given flow conditions, the length of the surface being treated as a variable. The simplest version of the method results in a description of the performance in terms of two parameters which can be interpreted as asymptotic or peak drag reduction rate (drag reduction/original drag) and half-drag-reduction length. Application of the method to published experimental data shows the first parameter to vary from about 5 to 30 percent and the second parameter from rather small distances to about 15 m.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Boundary layer control;Drag reduction;Turbulent boundary layer;Surface properties;Two dimensional flow
Subjects: ENGINEERING > Fluid Mechanics and Thermodynamics
Division/Department: Flight Mechanics and Control Division, Fluid Dynamics, Fluid Dynamics
Depositing User: M/S ICAST NAL
Date Deposited: 13 Oct 2006
Last Modified: 24 May 2010 09:51
URI: http://nal-ir.nal.res.in/id/eprint/2995

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