P. Capbern

The first part of this paper deals with the theoretical design of a double-slotted flap for a Natural Laminar Flow (NLF) airfoil. This study is conducted mainly by using an incompressible viscous-inviscid strong coupling method developed at ONERA. Moreover, a leading edge (L.E.) suction system is designed in order to increase the maximum lift coefficient (Clmax> by delaying stall. The second part of the paper presents the results of (2-D) wind-tunnel tests aimed at optimizing and evaluating the take-off, approach and landing configurations. The effects on Clmax of the leading edge suction system previously designed are investigated, including the optimization of the suction area and of the mass-flow. These tests (Reynolds = 2,3 10^6) exhibit for the landing configuration some very low values of the maximum angle of attack ([alpha]max), probably due to leading-edge stall. However, this type of stall may be delayed at a higher Reynolds number, which would result in an increase of amax and Clmax. The tests also show that amax is increased by leading edge suction, but this improvement does not seem to be sufficient.

First European Forum on Laminar Flow Technology, Hamburg, 1992

Conference Paper

englisch

21,0 x 29,7 cm, 10 Seiten

DGLR-Bericht, 1992, 1992-06, First European Forum on Laminar Flow Technology; S.309-318; 1992; Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn

NA

aerodynamics, laminar flow

Bestellbar

1992