Prediction of viscous effects on an aerofoil using transpiration model for the effects of boundary layer and wake

Desai, SS and Rangarajan, R (1986) Prediction of viscous effects on an aerofoil using transpiration model for the effects of boundary layer and wake. Technical Report. National Aeronautical Laboratory, Bangalore, India.

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Abstract

Details are given here of modifications to an existing code13; NALSOF 0008 (TRADE 1) for the analysis of transonic flow past aerofoils, to include the displacement effects of the boundary layer and wake and of the curvature of the wake. Lag entrainment method of Green et al is used, to calculate the boundary layer and the wake. The inviscid calculations are based on the method originally developed by Carlson which was subsequently improved at NAL. The displacement effects of the boundary layer and of the wake are included using an equivalent transpiration model in which a non-zero normal velocity is imposed on the body and at all points of the trailing edge slit which is treated as the mean line of the wake. The jump in potential across the mean wake line is varied depending on the wake thickness and a change in13; circulation is imposed, depending on curvature at the grid points located, downstream of the trailing edge. Results are presented giving comparison with several experiments.

Item Type: Monograph (Technical Report)
Uncontrolled Keywords: Aerofoils;Transonic flow;Full-potential equation;13; Transpiration;Viscous effects
Subjects: AERONAUTICS > Aerodynamics
Depositing User: Users 64 not found.
Date Deposited: 15 Nov 2006
Last Modified: 24 May 2010 04:23
URI: http://nal-ir.nal.res.in/id/eprint/3433

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