| 释义 |
ˈdownwash Aeronaut.
[down adv. 41.]
The downward deflection of an air-stream by an aerofoil or other body; downwash angle (see quot. 1919). Hence (rare) downwash v.
1915Rep. & Mem. Advisory Comm. for Aeronautics, No. 196 v. 125 It appeared possible that the advantage of such increased lift might introduce a concomitant disadvantage in an increased ‘downwash’ in the neighbourhood of the tail planes. 1919W. B. Faraday Gloss. Aeronaut. Terms 21 Downwash angle, the angle through which the airstream relative to the aeroplane is deflected by an aerofoil or other body. Measured in a plane parallel to the plane of symmetry. 1922Encycl. Brit. XXX. 19/2 The reaction upon the rear plane is therefore inclined backward by the angle through which the air has been ‘downwashed’ by the leading plane. 1931Flight 20 Nov. 1148/1 The amazing control of the Autogiros, old as well as new, is very largely due to the downwash from the rotor blades. 1966D. Stinton Anat. Aeroplane v. 58 To generate a given lift at a given airspeed an aerofoil of long span has to impart a smaller downwash to the air it meets than an aerofoil of shorter span. |