On the origin of the double cellular structure of the detonation in gaseous nitromethane and its mixtures with oxygen
On the origin of the double cellular structure of the detonation in gaseous nitromethane and its mixtures with oxygen
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DOI：
10.1007/s00193-004-0236-3
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发表时间：
2005-06
期刊：
影响因子：
2.2
通讯作者：
M. Sturtzer;Nathalie Lamoureux;Christophe Matignon;D. Desbordes;H. Presles
中科院分区：
文献类型：
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作者：
M. Sturtzer;Nathalie Lamoureux;Christophe Matignon;D. Desbordes;H. Presles
在气态硝基甲烷（NM）和硝基甲烷-氧混合物中爆轰的实验研究表明，在当量比为1.3 ~ 1.75 （NM）的范围内，存在双胞结构。利用ZND模型中详细的化学方案对相同当量比范围内的爆轰反应区进行了计算，结果表明，化学能是在两个主要的连续不同的放热反应步骤中释放的，这些放热反应步骤具有各自的诱导长度，这证明了两级爆轰细胞结构的存在。这一结果加强了细胞爆轰结构源于反应区内局部高能量释放率延迟而放大的不稳定性的观点。
An experimental study of the detonation in gaseous nitromethane (NM) and nitromethane-oxygen mixtures has exhibited unambiguously the existence of a double cellular structure in the range of equivalence ratiofrom 1.3 to 1.75 (NM). Calculations of the reaction zone of the detonation in the same range of equivalence ratio, using a detailed chemical scheme in the ZND model, demonstrate that the chemical energy is released in two main successive distinct exothermic reaction steps characterized by their own induction length which justifies the existence of a two levels detonation cellular structure. This result strengthens the idea that the cellular detonation structure finds its origin in instabilities amplified by delayed local high energy release rate inside the reaction zone.