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Aerodynamic analysis of the loft anomaly observed on orbital flight tests of the space shuttleThe loft anomaly observed during the launch phase of the orbital flight tests (OFT) of the Space Shuttle is described and evidence that the loft anomaly resulted from previously unobserved aerodynamic phenomena is presented. The anomaly was that the altitude at staging was higher than anticipated. The anticipated altitude profile was predicted on wind tunnel test results that did not accurately simulate the flow between the orbiter vehicle and external tank and did not adequately simulate the engine plumes and thus the base pressures. An analogy is used to relate the flow between the orbiter and external tank to the flow in a two dimensional channel. Plume simulation is identified as a major goal during wind tunnel testing, and a wind tunnel test that was conducted to provide the best possible representation of the plume effect on the channel flow field is described.
Document ID
19840002053
Document Type
Conference Paper
Authors
Surber, T. E. (Rockwell International Corp. Downey, CA, United States)
Stone, J. S. (Rockwell International Corp. Downey, CA, United States)
Date Acquired
August 12, 2013
Publication Date
October 1, 1983
Publication Information
Publication: NASA. Langley Research Center Shuttle Performance: Lessons Learned, Part 1
Subject Category
SPACE TRANSPORTATION
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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