Nozzles for a reaction drive blade tip with turning vanes
AssigneeRj Helicopter Corporation
InventorDavid J. White
Life of this patent
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Abstract
A nozzle for use with a rotor blade for a reaction drive type helicopter includes a first wall, a second wall opposing the first wall, and sidewalls extending between the first wall and the second wall enclosing a cavity having an upstream end and a downstream end. The nozzle includes an inlet section for receiving a gasflow at the upstream end. The distance between the first wall and the second wall reduces to a throat downstream of the inlet section. An expansion section extending from the throat, downstream thereof.
Claims4
A nozzle for use with a rotor blade for a reaction drive type helicopter, the nozzle comprising:
- a first wall;
- a second wall opposing the first wall;
- sidewalls extending between the first wall and the second wall enclosing a cavity having an upstream end and a downstream end;
- the first wall and the second wall defining an inlet section for receiving a gasflow at the upstream end;
- the distance between the first wall and the second wall reducing to a throat downstream of the inlet section;
- and
- an expansion section extending from the throat, downstream thereof,
- wherein the first wall is planar and the second wall converges inwardly to the throat at a contoured section, the contoured section of the second wall is described by a fifth order polynomial spline fit.
A nozzle for use with a rotor blade for a reaction drive type helicopter, the nozzle comprising:
- a first wall;
- a second wall opposing the first wall;
- sidewalls extending between the first wall and the second wall enclosing a cavity having an upstream end and a downstream end;
- the first wall and the second wall defining an inlet section for receiving a gasflow at the upstream end, the inlet section has a width and a depth;
- at least one of the first wall and the second wall converge toward the other of the first wall and the second wall inwardly at a downstream end thereof, reducing the depth of the inlet section at the downstream end thereof, to a throat;
- an expansion section extending from the throat;
- and
- a nozzle exit aspect ratio less than 8:1, wherein the first wall is planar and the second wall converges inwardly to the throat at a contoured section, the contoured section of the second wall is described by a fifth order polynomial spline fit.
Dependencies are inferred from the claim text.