This paper describes the effects of vibrational relaxation on sonic boom waveforms in a stratified atmosphere. Full-field direct simulations with vibrational nonequilibrium are performed over uniform and stratified atmospheres, extending from a supersonic body to the ground level. The governing equations are the three-dimensional Euler equations, combined with the conservation equations for vibrational energies of O 2 and N 2 . The translational–vibrational energy exchange is evaluated using the Landau–Teller rate model. The full-field simulations reproduce the Drop test for Simplified Evaluation of Non-symmetrically Distributed sonic boom (D-SEND) #1, by the Japan Aerospace Exploration Agency. The computational results show that weak shock waves at a moderate relaxation time are dispersed, and the rise time occurs. A wave structure in one relaxing mode is classified according to the relaxation time. The effects of two relaxing modes are comparable to those obtained from a superposition of each mode. For a stratified atmosphere, the effects of vibrational relaxation at each altitude are similar to those for uniform atmospheres at the same altitudes. However, a wave structure does not monotonically change toward the ground, unlike the case of uniform atmosphere. Such a complex transition mechanism of wave structure in real atmospheric environments is clarified.


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    Titel :

    Effects of Vibrational Relaxation on Sonic Boom Waveforms in a Stratified Atmosphere


    Beteiligte:
    Yamashita, Rei (Autor:in) / Suzuki, Kojiro (Autor:in)

    Erschienen in:

    AIAA Journal ; 58 , 9 ; 3987-4002


    Erscheinungsdatum :

    2020-06-30


    Format / Umfang :

    16 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch





    Full-Field Sonic Boom Simulation in Stratified Atmosphere

    Yamashita, Rei / Suzuki, Kojiro | AIAA | 2016


    Full-Field Sonic Boom Simulation in Stratified Atmosphere

    Yamashita, Rei | Online Contents | 2016


    Propagation of sonic boom through a stratified atmosphere

    Hayes, W. D. / Runyan, H. L., Jr. | NTRS | 1970


    Full-Field Sonic Boom Simulation in Stratified Atmosphere

    Yamashita, Rei | Online Contents | 2016