Shiro Kubota, Kunihito Nagayama, Yuji Wada, and Yuji Ogata
久保田士郎，永山邦仁，和田有司，緒方雄二
p.141-146
Abstract
In numerical simulations of shock initiation process of condensed explosive, state variables in reaction zone are regarded as simple mixture phase of the unreacted and the reacted components. The relations of the specific volumes of the unreacted and the reacted component were investigated under the four types of assumptions. From the numerical results, it was indicated that the specific volume of the unreacted component can be described by the specific volume of the reacted component under the certain assumptions. This relation can be applied as the simplified pressure calculations of the reacting explosive. The reason why there is such relation is that the unreacted and the reacted components approximately pass two types of single lines in Pressure and specific volume plane, respectively. It has been found that the compression processes of reacted component in reaction zone have the path close to Hugoniot line for reacted component under isentropic solid assumption.
凝縮系爆薬の衝撃起爆の数値解析において，多くの場合，反応領域の状態量はその未反応成分と反応成分との単純な混合相として取り扱われる。この報告では，異なる4通りの仮定のもとで，求められる未反応成分と反応成分との比体積の関係について調べた。数値計算結果から次のことが分かった。ある条件のもとで，未反応成分の比体積は近似的に内部エネルギーや反応率に依存しない反応成分の比体積の関数として表せる。この関係は反応領域の圧力計算簡略化に応用できる。この関係が成立する条件は，未反応成分と反応成分との状態量が，圧力-体積面においてどちらも単一の線に沿って変化することである。未反応成分が等エントロピー的に変化すると仮定した場合，その反応成分は爆轟生成ガスのHugoniotに近い状態変化を示す。
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Keywords
Shock initiation process, Reacting explosive, Simple mixture theory, Numerical simulation
