NDLI: Experimental and computational analysis of shuttle orbiter hypersonic trim anomaly

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Experimental and computational analysis of shuttle orbiter hypersonic trim anomaly

Content Provider	NASA Technical Reports Server (NTRS)
Author	Paulson Jr., John W. Weilmuenster Sr., K. James Brauckmann, Gregory J.
Copyright Year	1995
Description	During the high-Mach-number, high-altitude portion of the first entry of the Shuttle Orbiter, the vehicle exhibited a nose-up pitching moment relative to preflight prediction of approximately Delta Cm = 0.03. This trim anomaly has been postulated to be due to compressibility, viscous, and/or real-gas (lowered specific heat ratio gamma) effects on basic body pitching moment, body-flap effectiveness, or both. In order to assess the relative contribution of each of these effects, an experimental study was undertaken to examine the effects of Mach number, Reynolds number, and ratio of specific heats. Complementary computational solutions were obtained for wind-tunnel and flight conditions. The primary cause of the anomaly was determined to be lower pressures on the aft windward surface of the Orbiter than deduced from hypersonic wind-tunnel tests with ideal- or near-ideal-gas test flow. The lower pressure levels are a result of the lowering of the flowfield gamma due to high-temperature effects. This phenomenon was accurately simulated in a hypersonic wind tunnel using a heavy gas, which provided a lower, gamma, and was correctly predicted by Navier-Stokes computations using nonequilibrium chemistry.
File Size	711066
Page Count	8
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19970009643
Archival Resource Key	ark:/13960/t7wm66s9d
Language	English
Publisher Date	1995-10-01
Access Restriction	Open
Subject Keyword	Space Transportation Pitching Moments Flight Conditions Reynolds Number Hypersonic Wind Tunnels Space Shuttle Orbiters Navier-stokes Equation Specific Heat Temperature Effects Gas Flow Flow Distribution Ideal Gas Wind Tunnel Tests Anomalies Mach Number Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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