December 2005 

NASA/TM-2005-213927 

An Evaluation of Measured Pressure Signatures 

From Wind-Tunnel Models of Three LowBoom Concepts 

Robert J. Mack 

Langley Research Center, Hampton, Virginia 
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December 2005 

NASA/TM-2005-213927 

An Evaluation of Measured Pressure Signatures 

From Wind-Tunnel Models of Three LowBoom Concepts 

Robert J. Mack 

Langley Research Center, Hampton, Virginia 
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NASA Center for AeroSpace Information (CASI) National Technical Information Service (NTIS) 

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Technical Memorandum

 4. TITLE AND SUBTITLE

An Evaluation of Measured Pressure Signatures From Wind-Tunnel

Models of Three Low-Boom Concepts

5a. CONTRACT NUMBER

 6. AUTHOR(S)

Mack, Robert J.

 7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES)

NASA Langley Research Center

Hampton, VA 23681-2199

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National Aeronautics and Space Administration

Washington, DC 20546-0001

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L-19127

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NASA

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An electronic version can be found at http://ntrs.nasa.gov

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Unclassified - Unlimited

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Availability: NASA CASI (301) 621-0390

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STI Help Desk (email: help@sti.nasa.gov)

14. ABSTRACT

Revised 1990-1991 sonic-boom design and analysis methodology was assessed by applying it to the design of three low-boom

concepts. Models of these concepts were built and used to measure pressure signatures in the wind tunnel. An analysis of

wind-tunnel data showed unexpected nacelle-inlet and the nacelle-wing interference-lift shocks in the pressure signatures

from the two engine-under-the-wing models, but not in the measured pressure signatures from the wind-tunnel model with the

engine nacelles mounted on the aft fuselage. However, additional lift-induced shocks were found in the pressure signature

data from all three wind-tunnel models indicating that other flow-field disturbance effects were present.

15. SUBJECT TERMS

Sonic boom; Low-boom concepts; Wind-tunnel models; Method validation

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NASA/TM-2005-213927

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01- 12 - 2005