Effects of uncertainties in atmospheric turbulence and weather predictions on sonic boom

Kuninori Fujino, Ryota Kikuchi, Koji Shimoyama, Shigeru Obayashi, Yoshikazu Makino

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Citations (Scopus)

Abstract

In order to achieve sonic boom reduction in real-world atmosphere, we investigate the effects of uncertainties in atmospheric turbulence and numerical weather prediction (NWP) models on sonic boom. We simulate sonic boom propagation of the Drop test for the Simplified Evaluation of Non-symmetrically Distributed sonic boom (D-SEND) #2 flight test, which was conducted by the Japan Aerospace Exploration Agency (JAXA), using the Tohoku University Xnoise (TUXnoise). TUXnoise is a sonic boom analysis tool based on the Khokhlov-Zabolotskaya-Kuznetsov (KZK) equation and capable to consider diffraction, axial convection, and transverse convection effects induced by atmospheric turbulence. First, the sonic boom propagation is simulated with different transverse size of the simulation domain, which is related to the reproducibility of the effects of atmospheric turbulence. The results indicate that the simulation requires a sufficiently large domain size for a good agreement with the measurement in D-SEND#2 flight test. Second, the sonic boom propagation is simulated under the atmospheric uncertainties such as temperature, humidity, and wind velocity uncertainties estimated by ensemble forecast. The results indicate that wind velocity uncertainty can affect sonic boom significantly through a consideration of atmospheric turbulence. They also indicate that the effect of humidity uncertainty on minimum peak pressure is small because the relaxation effects in the KZK equation depend on humidity and inactive in rounded sonic boom signatures, which result in minimum peak pressure. In addition, it is confirmed that the effects of atmospheric turbulence can change significantly even with a slight change of the propagation path. Finally, the sonic boom propagation is simulated with different atmospheric boundary layer (ABL) height (ABLH). Atmospheric turbulence is assumed to exist in ABL. The results indicate that ABLH must be estimated carefully to evaluate sonic boom properly because the sonic boom is affected more significantly as ABL is thicker. They also indicate that wind shear layers over ABL can be other factors to produce atmospheric turbulence and affect the sonic boom signature when D-SEND#2 flight test was conducted. Hence, the uncertainties in atmospheric turbulence and NWP models must be carefully taken into account for more accurate simulation of sonic boom propagation.

Original languageEnglish
Title of host publicationAIAA SciTech Forum - 55th AIAA Aerospace Sciences Meeting
PublisherAmerican Institute of Aeronautics and Astronautics Inc.
ISBN (Electronic)9781624104473
DOIs
Publication statusPublished - 2017
Event55th AIAA Aerospace Sciences Meeting - Grapevine, United States
Duration: 2017 Jan 92017 Jan 13

Publication series

NameAIAA SciTech Forum - 55th AIAA Aerospace Sciences Meeting

Other

Other55th AIAA Aerospace Sciences Meeting
CountryUnited States
CityGrapevine
Period17/1/917/1/13

ASJC Scopus subject areas

  • Aerospace Engineering

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