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titleCharacteristics method applied to a line source explosion
Other Title線状爆発における特性法を用いた解析について
Author(jpn)東野 文雄; 坂口 堯; 林 光一; 小川 哲
Author(eng)Higashino, Fumio; Sakaguchi, Gyo; Hayashi, A. Koichi; Ogawa, Satoru
Author Affiliation(jpn)青山学院大学; 首都大学東京; 青山学院大学; 宇宙航空研究開発機構 総合技術研究本部 計算科学研究グループ
Author Affiliation(eng)Aoyama Gakuin University; Tokyo Metropolitan University; Aoyama Gakuin University; Japan Aerospace Exploration Agency Computational Science Research Group, Institute of Aerospace Technology
Issue Date2008-03-31
PublisherJapan Aerospace Exploration Agency (JAXA)
Publication date2008-03-31
AbstractCylindrical blast waves generated in a real air is investigated by means of the method of characteristics under the assumption of a line source explosion. The effect of dissociation on shock wave propagation in air is evaluated by utilizing an effective isentropic index. The effect of dissociation is remarkable in the velocity profiles behind shock front for initial shock strengths between M(sub 0) = 4 and 8. Various mesh sizes on numerical computation are tested to determine the trajectory of the shock front in the time-space domain. In the case of perfect gases without dissociation, the 51 points on a constant time line are enough to integrate the characteristic equations. For dissociating gases, the 201 points are necessary to continue stable computations. Pressure profiles at a long time elapse after explosion reveal that the pressure in the vicinity of the explosion center gradually decreases below the initial pressure of the atmosphere different from similarity solutions.
DescriptionJAXA Research and Development Memorandum
Keywordsone dimensional flow; gas explosion; gas dissociation; shock wave propagation; line source explosion; velocity distribution; pressure distribution; similarity solution; dimensional analysis; unsteady flow; 1次元流; ガス爆発; ガス解離; 衝撃波伝搬; 線状爆発; 速度分布; 圧力分布; 相似解; 次元解析; 非定常流
Document TypeTechnical Report
JAXA Category研究開発資料
Report NoJAXA-RM-07-017E

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