Air intake system for engine
AssigneeThe De Havilland Aircraft of Canada, Limited
InventorFrederick L. Gilbertson
Life of this patent
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Abstract
An intake system for removing particles from air entering an engine, in which the intake air in an intake duct is divided into a primary airstream which flows upwardly at a sharp angle from the intake stream and into the engine inlet, and a secondary airstream which flows directly rearwardly with the particles to be removed, into a plenum where the particles are collected. A third airstream is formed which flows forwardly from the plenum beneath and at the sides of the intake duct, then upwardly around the sides of the intake duct and into the engine inlet.
Claims20
For use with an engine having an air inlet, a separator for removing foreign particles from the air entering said inlet, said separator comprising:
- (a) an air intake duct formed for an intake airstream to flow in a first substantially rearward path therein,
- (b) a plenum behind said intake duct,
- (c) said intake duct having guide means for separating from said intake airstream a primary airstream and for guiding said primary airstream in a second path at a substantial angle to said first path for passage into said engine inlet,
- (d) said intake duct being oriented to discharge substantially rearwardly into said plenum a secondary stream of said air from said intake airstream so that particles entering said intake duct with said air will tend to travel into said plenum with said secondary airstream and will be separated from said primary airstream,
- (e) duct means connected to said plenum and formed to guide a third stream of air from said plenum forwardly along a third path substantially separated by said duct means from said second path and then to discharge said third airstream smoothly into said primary airstream,
- (f) and means in said plenum for removing foreign particles from said plenum.
In an aircraft, a nacelle having an engine therein, said engine having an air inlet, and a separator for removing foreign particles from the air entering said inlet, said separator comprising:
- (a) a housing having front, side and bottom walls,
- (b) means connecting said housing to said nacelle,
- (c) an air intake duct in said housing and extending rearwardly from said front wall, said intake duct having bottom, side and top walls and being formed for an intake airstream to flow in a first substantially rearward path therein,
- (d) said bottom wall of said intake duct being spaced from the bottom wall of said housing and said sidewalls of said intake duct being spaced from said sidewalls of said housing,
- (e) said top wall of said intake duct having an upwardly curved rear portion extending to said engine inlet and an upper opening behind said rear portion, for separating from said intake airstream a primary airstream and for guiding said primary airstream along a second upwardly sloping path at a substantial angle to said first path through said opening and into said engine inlet,
- (f) said housing having a plenum therein behind said intake duct,
- (g) said intake duct being oriented to discharge substantially rearwardly into said plenum a secondary stream of said air from said intake airstream and separated from said primary airstream so that particles entering said intake duct with said air will tend to travel into said plenum with said secondary airstream and will be separated from said primary airstream,
- (h) duct means connected to said plenum, said duct means having a first duct portion extending forwardly from said plenum and comprising the space between said bottom wall of said intake duct and the bottom wall of said housing, a second duct portion communicating with said first duct portion and extending upwardly and comprising the spaces between each sidewall of said intake duct and the respective sidewalls of said housing, and a third duct portion communicating with said second duct portion and extending rearwardly and upwardly over said rear portion of said top wall of said intake duct and to said engine inlet, for a third stream of air to flow from said plenum through said duct means and to be discharged into said engine inlet,
- (i) and door means in said plenum for removing foreign particles from said plenum.
Dependencies are inferred from the claim text.