| 摘要 |
An air discharge valve for an aircraft has an inner valve flap ( 1 ) and an outer valve flap ( 3 ) which partially overlap each other to form a nozzle of the Laval type with a nozzle inlet ( 6 ) converging toward a nozzle neck (S) and with a nozzle outlet ( 7 ) diverging away from the nozzle neck (S). The inner valve flap ( 1 ) has a trailing edge ( 8 A) hinged to the aircraft body and a first leading edge ( 8 ) facing in the flight direction and having a curved sectional configuration. The outer valve flap ( 3 ) has a second leading edge ( 9 ) hinged to the aircraft body and a trailing edge ( 9 A). Both flaps ( 1, 3 ) have a wedge shape. An outwardly facing surface portion ( 11 B) of the inner flap ( 1 ) forms an air flow guide for air flowing out of the nozzle outlet ( 7 ). An inwardly facing surface portion ( 15 B) of the outer flap ( 3 ) forms an air flow guide into the nozzle inlet ( 6 ) formed by the curved sectional configuration of the first leading edge ( 8 ) and by the inwardly facing surface portion ( 15 B).
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