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Study for Air Vehicles at High Speeds, Identifying the Potential Benefits to Transport Aircraft of a Continuously Variable Geometry Trailing-Edge Structure that can be Utilized for Aircraft Control, Trim, Load-Alleviation, and High Lift
Final rept. 27 Sep 2010-27 Mar 2011
NANGIA AERO RESEARCH ASSOCIATES BRISTOL (UNITED KINGDOM)
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One of the technologies emerging in recent years concerns variable aerofoil shaping or morphing, using clever internal mechanisms. Previous studies have noted potential aerodynamic efficiency gains, gust loads alleviation, stagnation point control for laminar flow onset or Shock position strength control. Previous work along some of these lines has also been in TACT MAW programs. Although such mechanisms may provide a lower sectional Clmax, compared with a point design high-lift system, the main advantage is that these mechanisms could be utilized across the entire flight envelope for different functions. It is also known that to obtain optimum LD performance at high-lift, TE deflections may need to be accompanied by LE deflections or devices. Many, varied aspects of VTE technology have been assessed. At high and low speed, a VTE capable wing provides higher LD. This advantage can be assimilated in a variety of ways, increased range efficiency gives typically 5 to 15 increase in range, Take-Off field lengths are reduced by 10 to 15 depending upon Clmax capability. A wing with VTE capability can control off-design gust loads thereby reducing structural strength requirements leading to a lighter wing. Using simplified but modest assumptions, the wing weight saving can be immediately absorbed as increased payload within given MTOW. On current, reasonably fuel efficient, long-range civil transports this leads to 45 increased efficiency. On small, comparatively inefficient long-range executive transports the wing weight reduction virtually doubles the design payload leading to 70 to 80 increase in efficiency.
APPROVED FOR PUBLIC RELEASE