A Theoretical Discussion of High-lift Aerofoils with Leading-edge Porous Suction

摘要

It is shown in this report that by the principle of porous suction high lift coefficients can be obtained on thin aerofoils by the use of surprisingly small amounts of suction. It is more economical to use porous suction than to suck through a slot at or near the leading edge:and it is necessary to realise that in general the principles involved in the two types of suction are rather different. The discussion is restricted to aerofoils with rounded leading edges, since it is difficult to predict theoretically the effect of any type of suction on flow near a sharp edge.nThere are given graphs showing estimates of the quantities of air to be sucked on three different typical thin sections to produce any reasonable desired lift coefficient.