日本航空宇宙学会論文集
Online ISSN : 2432-3691
Print ISSN : 1344-6460
ISSN-L : 1344-6460
論文
全空間シミュレーションによる極超音速飛行時のソニックブーム解析
山下 礼鈴木 宏二郎
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ジャーナル 認証あり

2014 年 62 巻 3 号 p. 77-84

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抄録

This paper describes the effectiveness of the direct simulation for the sonic boom prediction over the whole computational domain from the body to the ground and the nature of the sonic boom propagation for the hypersonic vehicle. Both the near and far fields around an axi-symmetric paraboloid are numerically obtained by the axi-symmetric Euler analyses assuming the uniform atmosphere. Moreover, the three dimensional Euler analyses with the gravity term have been conducted to consider the variation of the atmospheric properties with the altitude. Consequently, it is confirmed that the direct simulations are the same level of accuracies of waveform parameter method. Furthermore, the nature of the sonic boom propagation does not change up to Mach 7 in the uniform atmosphere and Mach 5 in the real atmosphere, when the small disturbance is assumed. Therefore, the evaluation method for the sonic boom propagation at the supersonic speed is applicable to predict the sonic boom strength at the hypersonic speed. At the ground level, the sonic boom intensity generated by the Mach 5 flight at 25km altitude is less than the intensity by the Mach 2 flight at 15km altitude.

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© 2014 The Japan Society for Aeronautical and Space Sciences
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