JAXA Repository / AIREX 未来へ続く、宙(そら)への英知
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Other TitleStudy on Hypersonic Aerodynamic Characteristics of Itokawa-type Asteroid at Atmospheric Entry
Author(jpn)和泉, 有祐; 鈴木, 宏二郎
Author(eng)Izumi, Yusuke; Suzuki, Kojiro
Author Affiliation(jpn)東京大学大学院新領域創成科学研究科; 東京大学大学院新領域創成科学研究科
Author Affiliation(eng)Graduate School of Frontier Science, University of Tokyo; Graduate School of Frontier Science, University of Tokyo
Issue Date2011-02-28
PublisherJapan Aerospace Exploration Agency (JAXA)
Publication titleJAXA special publication: Proceedings of 42nd Fluid Dynamics Conference / Aerospace Numerical Simulation Symposium 2010
宇宙航空研究開発機構特別資料: 第42回流体力学講演会/航空宇宙数値シミュレーション技術シンポジウム2010 論文集
Publication date2011-02-28
AbstractThe aerodynamic characteristics of the extraterrestrial entry body having the shape of asteroid 25143 Itokawa have been numerically and experimentally investigated. Unlike aerospace vehicles, such natural object has significant irregularity in its shape, and the variation of its aerodynamic characteristics with respect to its attitude becomes complicated. Based on the database of Itokawa's shape distributed by JAXA, we construct the numerical model for the Newtonian analysis. Using the rapid prototyping machine, the experimental model was made based on the same database with small manufacturing time and cost. The results of the hypersonic wind tunnel experiments conducted at Kashiwa campus, the University of Tokyo show that the aerodynamic characteristics of such complicated body are successfully estimated by the Newtonian analysis within the error of 25%. For convenience at the description of the configuration and the arbitrary attitude of the body, the three axes are defined. The variation of the aerodynamics characteristics with respect to each axis is estimated by the Newtonian method, and the maximum L/D of 0.5 is obtained. This fact means that an Itokawa-type extraterrestrial object can have some cross-range capability at the earth's atmospheric entry. The attitude to have the static stability is found by searching any pair of those axes. At this attitude, the body may rotate around the other axes. In fact, the experimental model supported by a ball joint performed the spin motion at high rate of 300 Hz around an axis and the spin axis is almost fixed in the hypersonic flow at Mach 7. Those results are useful for the trajectory analysis of hazardous entry of extraterrestrial bodies in both the past and the future.
DescriptionOriginal contains color illustrations
Meeting Information: 42nd Fluid Dynamics Conference / Aerospace Numerical Simulation Symposium 2010 (June 24-25, 2010. Yonago Convention Center BiG SHiP), Yonago, Tottori Japan
形態: カラー図版あり
会議情報: 第42回流体力学講演会/航空宇宙数値シミュレーション技術シンポジウム2010 (2010年6月24日-25日. 米子コンベンションセンター BiG SHiP)
Document TypeConference Paper
JAXA Category特別資料
Report NoJAXA-SP-10-012

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