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Coupled Analysis of an Inlet and Fan for a Quiet Supersonic AircraftA computational analysis of a Gulfstream isentropic external compression supersonic inlet coupled to a Rolls-Royce fan was completed. The inlet was designed for a small, low sonic boom supersonic vehicle with a design cruise condition of M = 1.6 at 45,000 feet. The inlet design included an annular bypass duct that routed flow subsonically around an engine-mounted gearbox and diverted flow with high shock losses away from the fan tip. Two Reynolds-averaged Navier-Stokes codes were used for the analysis: an axisymmetric code called AVCS for the inlet and a 3-D code called SWIFT for the fan. The codes were coupled at a mixing plane boundary using a separate code for data exchange. The codes were used to determine the performance of the inlet/fan system at the design point and to predict the performance and operability of the system over the flight profile. At the design point the core inlet had a recovery of 96 percent, and the fan operated near its peak efficiency and pressure ratio. A large hub radial distortion generated in the inlet was not eliminated by the fan and could pose a challenge for subsequent booster stages. The system operated stably at all points along the flight profile. Reduced stall margin was seen at low altitude and Mach number where flow separated on the interior lips of the cowl and bypass ducts. The coupled analysis gave consistent solutions at all points on the flight profile that would be difficult or impossible to predict by analysis of isolated components.
Document ID
20100041304
Acquisition Source
Glenn Research Center
Document Type
Presentation
Authors
Chima, Rodrick V. (NASA Glenn Research Center Cleveland, OH, United States)
Conners, Timothy R. (Gulfstream Aerospace Corp. Savannah, GA, United States)
Wayman, Thomas R. (Gulfstream Aerospace Corp. Savannah, GA, United States)
Date Acquired
August 24, 2013
Publication Date
September 29, 2009
Subject Category
Aerodynamics
Report/Patent Number
E-17533
Meeting Information
Meeting: NASA Fundamental Aeronautics Program 32rd Annual Meeting
Location: Atlanta, GA
Country: United States
Start Date: September 29, 2009
End Date: October 1, 2009
Funding Number(s)
WBS: WBS 984754.02.07.03.13.02
Distribution Limits
Public
Copyright
Public Use Permitted.

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