| 摘要 |
Apparatus to compensate for airflow blockage and attendant airflow separation, loss of lift, and flap buffeting caused by the support members connecting a flap to the stationary portion of the wing is disclosed. An airflow duct, located between the lower and upper surfaces of the flap, is dimensioned and positioned such that when the flap is extended, air flowing through the airflow duct is discharged over the blocked portion of the upper flap surface. A recessed airflow channel, formed in the upper surface of the flap to direct additional airflow over the blocked region, is included for use in situations in which the flap structure precludes an airflow duct of sufficient size to fully compensate for the airflow blockage. Duct closure doors are included to seal the airflow duct inlet opening when the flaps are retracted to thereby reduce drag during operation of the aircraft in the cruise regime. The duct closure doors include a configuration in which the closure door forms a portion of the airflow duct wall when the flap is extended and a configuration in which the closure door is arranged to fold about a portion of a flap actuation mechanism that would physically interfere with the operation of a conventionally configured duct closure door.
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