@inproceedings{oai:jaxa.repo.nii.ac.jp:00004754,
 author = {和泉, 有祐 and 鈴木, 宏二郎 and Izumi, Yusuke and Suzuki, Kojiro},
 book = {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, JAXA Special Publication: Proceedings of 42nd Fluid Dynamics Conference / Aerospace Numerical Simulation Symposium 2010},
 month = {Feb},
 note = {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), 42nd Fluid Dynamics Conference / Aerospace Numerical Simulation Symposium 2010 (June 24-25,  2010. Yonago Convention Center BiG SHiP), Yonago, Tottori Japan, The 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., 形態: カラー図版あり, Physical characteristics: Original contains color illustrations, 資料番号: AA0064967047, レポート番号: JAXA-SP-10-012},
 publisher = {宇宙航空研究開発機構, Japan Aerospace Exploration Agency (JAXA)},
 title = {大気圏突入を想定したイトカワ型小惑星の極超音速空力特性に関する研究},
 volume = {JAXA-SP-10-012},
 year = {2011}
}