Sonic boom variability due to homogeneous atmospheric turbulence

Hiroshi Yamashita, Shigeru Obayashi

研究成果: Article査読

15 被引用数 (Scopus)

抄録

This study describes the nondeterministic effect of homogeneous atmospheric turbulence on sonic boom propagation. The Sears-Haack body was calculated in three dimensions bycomputational fluid dynamics in inviscid flow (Euler) mode to create the near-field pressure wave. The homogeneous atmospheric turbulence field was represented by the finite sum of discrete Fourier modes based on the von Karman and Pao energy spectrum. The sonic boom signature was then calculated by the modified waveform parameter method, considering a random velocity of homogeneous atmospheric turbulence. The results of this study indicated that atmospheric turbulence has a marked influence on sonic boom overpressure during its propagation to the ground. In comparison to the no-turbulence condition, we found that the sonic boom decreased in 59% of the cases and increased in 41% of the cases. Thus, homogeneous atmospheric turbulence seems to favor a decrease, rather than an increase, in boom overpressure. In addition, we found that turbulence has a small effect on the propagation path from the flight altitude to the ground. Nonetheless, this small change in the propagation path may result in a variability, of the point at which the sonic boom reaches the ground, of up to 1820 ft in the north-south direction (flight direction) and 115 ft in the east-west direction.

本文言語English
ページ(範囲)1886-1893
ページ数8
ジャーナルJournal of Aircraft
46
6
DOI
出版ステータスPublished - 2009

ASJC Scopus subject areas

  • 航空宇宙工学

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