Aerofoil with variable geometry expansion surface

Details Aerofoil with variable geometry expansion surface Aerofoil with variable geometry expansion surface

B - Operations, Transporting

64

C

B64C 3/44 (2006.01) B64C 3/48 (2006.01) B64C 23/00 (2006.01)

Patent

CA 2114129

A wing, or similar article of aerofoil section, has a variable geomety surface for the active control of shock strength and transonic wave drag. In one embodiment, the wing has a region of distensible skin (4) aft of the line of maximum section, which extends along the span of the wing in those areas that experience drag. Pressure means (10, 20, 30) within the wing outwardly def- lest the distensible region and produce a local bulge in the expansion surface. This bulge induces pre-shock compression and re- duces the effect of the shock. The bulge is retracted by the natural elasticity of the skin material (which can be a conventional alu- minium alloy) upon removal of the applied pressure. In another embodiment, the wing has a ramp portion (14) which is outwardly deflectable for the same purpose, The invention is applicable to supercritical and natural laminar flow wings.

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