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Determination of Extrapolation Distance With Pressure Signatures Measured at Two to Twenty Span Lengths From Two Low-Boom ModelsA study was performed to determine a limiting separation distance for the extrapolation of pressure signatures from cruise altitude to the ground. The study was performed at two wind-tunnel facilities with two research low-boom wind-tunnel models designed to generate ground pressure signatures with "flattop" shapes. Data acquired at the first wind-tunnel facility showed that pressure signatures had not achieved the desired low-boom features for extrapolation purposes at separation distances of 2 to 5 span lengths. However, data acquired at the second wind-tunnel facility at separation distances of 5 to 20 span lengths indicated the "limiting extrapolation distance" had been achieved so pressure signatures could be extrapolated with existing codes to obtain credible predictions of ground overpressures.
Document ID
20060053284
Acquisition Source
Langley Research Center
Document Type
Technical Memorandum (TM)
Authors
Mack, Robert J. (NASA Langley Research Center Hampton, VA, United States)
Kuhn, Neil S. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 7, 2013
Publication Date
November 1, 2006
Subject Category
Acoustics
Report/Patent Number
L-19302
NASA/TM-2006-214524
Funding Number(s)
WBS: WBS 754-02-07-07
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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