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Potential for Sonic Boom Reduction of the Boeing HSCTThe HSR sonic boom technology program includes a goal of reducing the objectionable aspects of sonic boom. Earlier HSCT sonic boom studies considered achieving significant sonic boom reduction by the use of arrow-wing planforms and detailed shaping of the airplane to produce shaped waveforms (non N-waves) at the ground. While these design efforts were largely successful, the added risk and cost of the airplanes were judged to be unacceptable. The objective of the current work is to explore smaller configuration refinements that could lead to reduced sonic boom impact, within design and operational constraints. A somewhat modest target of 10% reduction in sonic boom maximum overpressure was selected to minimize the effect on the configuration performance. This work was a joint NASA/Industry effort, utilizing the respective strengths of team members at Boeing, NASA Langley, and NASA Ames. The approach used was to first explore a wide range of modifications and airplane characteristics for their effects on sonic boom and drag, using classical Modified Linear Theory (MLT) methods. CFD methods were then used to verify promising, modifications and to analyze modifications for which the MLT methods were not appropriate. The tea m produced a list of configuration changes with their effects on sonic boom and, in some cases, an estimate of the drag penalty. The most promising modifications were applied to produce a boom-softened derivative of the baseline Boeing High Speed Civil Transport (HSCT) configuration. This boom-softened configuration was analyzed in detail for the reduce sonic boom impact and also for the effect of the configuration modifications on drag, weight, and overall performance relative to the baseline.
Document ID
20000027651
Acquisition Source
Langley Research Center
Document Type
Conference Paper
Authors
Haglund, George T.
(Boeing Commercial Airplane Co. Seattle, WA United States)
Date Acquired
August 19, 2013
Publication Date
December 1, 1999
Publication Information
Publication: 1995 NASA High-Speed Research Program Sonic Boom Workshop
Volume: 2
Subject Category
Aerodynamics
Funding Number(s)
CONTRACT_GRANT: NAS1-20220
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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