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The Effect of Compressibility on the Maximum Lift Coefficient of Aerofoils at Subsonic Airspeeds

Published online by Cambridge University Press:  04 July 2016

L. R. Wootton
L. R. Wootton*
Affiliation:
Aerodynamics Division, National Physical Laboratory
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Extract

It has long been known that compressibility affects the maximum lift coefficient at Mach numbers as low as 0·15. A schematic flight envelope (Fig. 1) shows that there are two main phenomena to be considered; the effects of compressibility on the low speed stall, and on the high subsonic speed stall.

In the low speed stall regime there is, in general, a decrease of the maximum lift coefficient with increasing Mach number which is appreciable even at typical aircraft landing speeds. A knowledge of the lift boundary throughout the envelope is necessary if allowances are to be made for gusts and if a safe rough-air performance is to be determined.

Type
Research Article
Information
The Aeronautical Journal , Volume 71 , Issue 679 , July 1967 , pp. 476 - 486
Copyright
Copyright © Royal Aeronautical Society 1967

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