Abstract:
Wind tunnel measurements of the effects on twodimensional section characteristics of square ridge excrescences and of some gaps typical of those found round trailing-edge controls have been made at high subsonic Mach number and at Reynolds numbers up to 15.6 x 10power6, based on section chord length. The incremental drag due to a square ridge was found to be generally underestimated by applying an estimated magnification factor to flat-plate measurements. Trailing-edge control gaps affected lift and pitching moment characteristics of the aerofoil as well as drag. A tentative correlation of the measurements of drag due to spanwise gaps is suggested.
