| 摘要 |
1,024,963. Aerofoils. GENERAL ELECTRIC CO. July 8, 1964 [July 10, 1963], No. 28116/64. Heading B7W. [Also in Divisions Fl and F2] An aerofoil comprises a plurality of stacked thin flexible sheets, aligned and extending spanwise, each sheet being attached to its adjacent sheet along spaced seams, the seams on adjacent sheets being staggered in the manner of a honeycomb structure that has been flattened, and also comprises at least one structural member secured to the stack of sheets. The stack may be machined to the desired profile, and the sheets, which may for example be aluminium or stainless steel 0.001 inch thick, permit the camber of the aerofoil to be varied. In one embodiment, a stack 10 of sheets is bonded to leading edge and trailing edge sections 14, 15, which are relatively rotatable by linkwork 19. In another embodiment (Fig. 3, not shown), a stack 10 covers a flexible member 21 also deformable by relatively rotating the leading and trailing edges. The member 21 may be formed with spanwise extending grooves 26 connected to a pump 28 for boundary layer control or transpiration cooling. The grooves 26 may intersect chordwise extending grooves in the stack. In a further embodiment (Fig. 5, not shown), the camber variations are effected by a central member 33. One surface of the stack may be bonded to a flexible, preferably metallic sheet 30 to increase its rigidity. The sheets may be inclined (Fig. 6, not shown) for boundary layer blowing. |
