Washout

航空发表于 2011-1-15 19:02:42

Twist incorporated in wing tips to raise the trailing edge, to give less incidence at the tip than at the root. Washout inherently makes the aircraft more stable.

航空发表于 2011-1-15 19:04:19

Washout refers to a feature of wing design to deliberately reduce the lift distribution across the span of the wing of an aircraft. The wing is designed so that angle of incidence (angle to the fuselage) is higher at the wing roots and decreases across the span, becoming lowest at the wing tip. This is usually to ensure that, at the stall, the wing root stalls before the wing tips, providing the aircraft with continued aileron control and some resistance to spinning. Washout may also be used to modify the spanwise lift distribution to reduce lift-induced drag.
Washout is commonly achieved by designing the wing with a slight twist, reducing the angle of incidence from root to tip, and therefore causing a lower angle of attack at the tips than at the roots. This is sometimes referred to as structural washout, to distinguish it from aerodynamic washout.
Wingtip stall is unlikely to occur symmetrically, especially if the aircraft is maneuvering. As an aircraft turns, the wing tip on the inside of the turn is moving more slowly and is most likely to stall. As an aircraft rolls, the down-going wing tip is at higher incidence and is most likely to stall. When one wing tip stalls it leads to wing drop, a rapid rolling motion. Also, roll control may be reduced if the airflow over the ailerons is disrupted by the stall, reducing their effectiveness. Thus, a pilot may be unable to maintain control, perhaps leading to an unrecoverable spin.
On aircraft with swept wings, wing tip stall also produces an undesirable nose-up pitching moment which hampers recovery from the stall.
Washout may be accomplished by other means e.g. modified aerofoil section, vortex generators, leading edge wing fences, notches, or stall strips. This is referred to as aerodynamic washout. Its purpose is to tailor the spanwise lift distribution or reduce the probability of wing tip stall.
Winglets have the opposite effect to washout. Winglets promote a greater proportion of lift being generated near the wing tips. (This can be described as aerodynamic wash-in.) Winglets also promote a greater bending moment at the wing root, possibly necessitating a heavier wing structure. Installation of winglets may necessitate greater aerodynamic washout in order to provide the required resistance to spinning, or to optimise the spanwise lift distribution.

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Washout