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Minimization of sonic-boom parameters in real and isothermal atmospheresThe procedure for sonic-boom minimization introduced by Seebass and George for an isothermal atmosphere was converted for use in the real atmosphere by means of the appropriate equations for sonic-boom pressure signature advance, ray-tube area, and acoustic impedance. Results of calculations using both atmospheres indicate that except for low Mach numbers or high altitudes, the isothermal atmosphere with a scale height of 7620 m (25 000 ft) gives a reasonable estimate of the values of overpressure, impulse, and characteristic overpressure obtained by using the real atmosphere. The results also show that for aircraft design studies, propagation of a known F-function, or minimization studies at low supersonic Mach numbers, the isothermal approximation is not adequate.
Document ID
19750009271
Document Type
Other - NASA Technical Note (TN)
Authors
Darden, C. M. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 3, 2013
Publication Date
March 1, 1975
Subject Category
AIRCRAFT DESIGN, TESTING AND PERFORMANCE
Report/Patent Number
NASA-TN-D-7842
L-9810
Funding Number(s)
PROJECT: RTOP 743-35-31-02
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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