NASA Technical Reports Server (NTRS) : Flight pdf

NASA Technical Reports Server (NTRS) : Flight

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The effectiveness of a trailing disk, or trapped vortex concept, in reducing the base drag of a large body of revolution was studied from measurements made both in flight and in a wind tunnel. Pressure data obtained for the flight experiment, and both pressure and force balance data were obtained for the wind tunnel experiment. The flight test also included data obtained from a hemispherical base. The experiment demonstrated the significant base drag reduction capability of the trailing disk to Mach 0.93 and to Reynolds numbers up to 80 times greater than for earlier studies. For the trailing disk data from the flight experiment, the maximum decrease in base drag ranged form 0.08 to 0.07 as Mach number increased from 0.70 to 0.93. Aircraft angles of attack ranged from 3.9 to 6.6 deg for the flight data. For the trailing disk data from the wind tunnel experiment, the maximum decrease in base and total drag ranged from 0.08 to 0.05 for the approximately 0 deg angle of attack data as Mach number increased from 0.30 to 0.82

• Creator/s: NASA Technical Reports Server (NTRS
• Date: 11/1/1986
• Year: 1986
• Book Topics/Themes: NASA Technical Reports Server (NTRS), BASE PRESSURE, DRAG REDUCTION, FLIGHT TESTS, TRAILING EDGE FLAPS, TURBULENT FLOW, WIND TUNNEL TESTS, BODIES OF REVOLUTION, DISKS (SHAPES), HIGH REYNOLDS NUMBER, INCOMPRESSIBLE FLOW, MACH NUMBER, PRESSURE DISTRIBUTION, SUBSONIC FLOW, TRANSONIC FLOW, TRAPPED VORTICES, Powers, Sheryll Goecke, Huffman, Jarrett K., Fox, Charles H., Jr

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