TY - JOUR
T1 - Nonlinear propagation of shaped supersonic signatures through turbulence
AU - Stout, Trevor A.
AU - Sparrow, Victor W.
N1 - Funding Information:
The authors gratefully acknowledge supercomputing resources and funding for this research from the National Aeronautics and Space Administration via a subcontract with KBRwyle and thank NASA and KBRwyle for the signature data.
Publisher Copyright:
© 2018 Acoustical Society of America.
PY - 2018
Y1 - 2018
N2 - The amplitude and loudness of conventional N-wave sonic booms vary randomly after propagating through atmospheric turbulence towards the ground. Recent studies have shown that the turbulence effect depends on the amplitude of incoming N-wave. The next generation of supersonic aircraft are designed to produce shaped booms, which are generally lower in amplitude than N-waves and contain shocks with much longer rise times. In this paper, the effect of nonlinearity on shaped sonic booms propagating through turbulence is compared with that for N-waves. Results suggest that nonlinearity may have a negligible impact on loudness variations for shaped signatures, while the impact for N-waves can be significant. Propagation is modeled by solving an augmented KZK propagation equation including the effects of diffraction, thermoviscous absorption, relaxation, nonlinearity, and wind fluctuations.
AB - The amplitude and loudness of conventional N-wave sonic booms vary randomly after propagating through atmospheric turbulence towards the ground. Recent studies have shown that the turbulence effect depends on the amplitude of incoming N-wave. The next generation of supersonic aircraft are designed to produce shaped booms, which are generally lower in amplitude than N-waves and contain shocks with much longer rise times. In this paper, the effect of nonlinearity on shaped sonic booms propagating through turbulence is compared with that for N-waves. Results suggest that nonlinearity may have a negligible impact on loudness variations for shaped signatures, while the impact for N-waves can be significant. Propagation is modeled by solving an augmented KZK propagation equation including the effects of diffraction, thermoviscous absorption, relaxation, nonlinearity, and wind fluctuations.
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U2 - 10.1121/2.0000872
DO - 10.1121/2.0000872
M3 - Conference article
AN - SCOPUS:85064966243
SN - 1939-800X
VL - 34
JO - Proceedings of Meetings on Acoustics
JF - Proceedings of Meetings on Acoustics
IS - 1
M1 - 045011
T2 - 21st International Symposium on Nonlinear Acoustics, ISNA 2018
Y2 - 9 July 2018 through 13 July 2018
ER -