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The influence of mid-chord battle damage on the aerodynamic characterstics of two-dimensional wings

Published online by Cambridge University Press:  04 July 2016

A. J. Irwin  and
P. M. Render
A. J. Irwin
Affiliation:
Department of Aeronautical and Automotive Engineering, University of Loughborough, Loughborough, UK
P. M. Render
Affiliation:
Department of Aeronautical and Automotive Engineering, University of Loughborough, Loughborough, UK
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Abstract

This paper briefly considers the method of simulating gunfire damage to a wing and outlines the key basic assumptions used in modelling. The results of qualitative and quantitative investigations into the aerodynamic characteristics of a wing damaged at quarter chord are then presented. The results are discussed in terms of flow mechanisms, changes to surface pressure distributions and increments in lift, drag and pitching moment coefficients. For the damaged wing, the influence on force and moment coefficients was attributed to flow through the damage. This through flow was driven by the pressure differential between the upper and lower wing surfaces, and took one of two forms. The first form was a ‘weak-jet’ which formed an attached wake and resulted in small changes in force and moment coefficients. The second form resulted from either increased incidence, or damage size. This was the ‘strong-jet’, where through flow penetrated into the freestream flow, resulting in separation of the oncoming surface flow, and the development of a larger separated wake with reverse flow. The effect on force and moment coefficients was significant. The paper also compares the structure of the damage through flow with previously published results for jets in crossflows. Many similarities in the flow features were identified, although there were significant differences in the surface pressure distributions for the two cases.

Type
Research Article
Information
The Aeronautical Journal , Volume 104 , Issue 1033 , March 2000 , pp. 153 - 161
Copyright
Copyright © Royal Aeronautical Society 2000 

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