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AssigneeThe United States Government as represented by the National Aeronautics and Space Administration Office of General Counsel-Code GP
InventorsJohn C. Wilson, Craig S. Shaw
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A deflector for reducing swirling flow spillover occurring when gas flowing hrough curved ducting attempts to exit into a freestream flow. When a gas flows through curved ducting it develops a swirling motion and when it attempts to exit into a freestream it is forced down over the sides of the duct by the strong freestream flow rushing past. The deflector is arcuately shaped and positioned upstream and adjacent the exit end of the curved ducting. As the freestream flow travels over the surface of the deflector, it is turned toward the direction of the flow from the exit of the ducting and draws the exiting flow along with it. The drawn exit flow is straightened and strengthened and is able to penetrate into the freestream flow. Further the ends of the deflector generate vortices which draw along the swirling flow at the sides of the exit end and straighten and strengthen it also. Thus the problem of swirling flow spillover of a gas exiting curved ducting into a freestream flow is substantially eliminated.
In combination with a flight vehicle having an exhaust duct housing including a cowling and an exhaust shield through which extends a curved duct having an exhaust exit for exhausting engine gases into a freestream air flow, the improvement comprising a deflector positioned entirely upstream of and adjacent the exhaust exit;
Apparatus for reducing spillover inherent when aircraft hot engine gases flowing through a curved duct exits from the exhaust exit end of the curved duct into a freestream air flow, comprising an elongated deflector having square end tips mounted entirely upstream of and adjacent the exhaust exit end of the curved duct and having a span at least equal to the diameter of the exhaust exit end of the curved duct and having a concave curvature surface formed along the span thereof, the span of said deflector being alined substantially normal to the direction of flow of the freestream air and the concave curvature surface inclined such that the freestream air flow flowing over the concave curvature surface is turned toward the direction of flow of the gas exiting from the exhaust end of the exhaust duct.
Dependencies are inferred from the claim text.