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Aerodynamic and performance characteristics of a passive leading edge Kruger flap at low Reynolds numbers

Published online by Cambridge University Press:  27 January 2016

V. M. Moraris ,
N. J. Lawson  and
K. P. Garry
V. M. Moraris
Affiliation:
School of Engineering, Cranfield University, Cranfield, UK
N. J. Lawson*
Affiliation:
School of Engineering, Cranfield University, Cranfield, UK
K. P. Garry
Affiliation:
School of Engineering, Cranfield University, Cranfield, UK
*
[email protected]
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Abstract

An experimental and numerical study was performed on a Clark Y aerofoil with a 10% chord leading edge Kruger flap to examine its aerodynamic performance at Reynolds numbers of 0·6 × 106, 1 × 106, and 1·6 × 106, to help to identify the forces and moments acting on a basic configuration. A detailed comparison of the numerical and experimental data is presented in this paper. The leading edge flap was effective at high angles of attack with an increase in CL of up to 18% over a conventional no flap configuration and delayed separation by up to 3°. The moments around the Kruger flap rotation point were calculated from the numerical analysis as an initial stage in the design of a UAV passive flap system and they are also presented in the paper.

Type
Research Article
Information
The Aeronautical Journal , Volume 116 , Issue 1181 , July 2012 , pp. 757 - 767
Copyright
Copyright © Royal Aeronautical Society 2012 

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