Abstract

EGLINGTON, M. L.. Control of a Leading-Edge Flap using the Nose Pressure Distribution. R&D j. (Matieland, Online) [online]. 1992, vol.8, pp.25-34. ISSN 2309-8988.

The problem of controlling the deflection of a leading-edge flap has been investigated from an aerodynamic point of view. The effect of a leading-edge flap on a symmetrical Joukowski aerofoil (12% thickness-chord ratio) is investigated experimentally through a set of wind-tunnel tests and, to a limited extent, theoretically. This initial study shows that it may be possible to control the deflection of the flap, to prevent separation and optimize the C_l\C_d ratio, using the static pressure difference between symmetrical tappings at equal small surface distances from the leading edge, but on opposite surfaces of the aerofoil. In the process a linear relationship between this pressure difference and the angle of attack is obtained. Thus, a linear relationship between this pressure difference and C_x is also obtained.

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