Direct blast initiation of spherical gaseous detonations in highly argon diluted mixtures
Direct blast initiation of spherical gaseous detonations in highly argon diluted mixtures
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DOI：
10.1016/j.proci.2010.06.165
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
Bo Zhang;Vsevolods Kamenskihs;H. D. Ng;John H. S. Lee
中科院分区：
文献类型：
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作者：
Bo Zhang;Vsevolods Kamenskihs;H. D. Ng;John H. S. Lee
在这项研究中，直接引发高氩气稀释的混合物中的球形爆轰进行了研究。直接起爆是通过高压电容火花放电实现的，临界能量是由电流输出的分析来估计的。在实验中使用了用70%氩气高度稀释的化学计量的乙炔-氧混合物。以前的研究表明，爆炸的混合物，是高度稀释的氩气已被证明是“稳定的”，在反应区至少是分段层状所描述的ZND模型和细胞的不稳定性起次要作用的爆轰传播。实验结果表明，对于氩气高度稀释的乙炔-氧气混合物，爆轰“稳定”的临界能量与Zel'dovich判据的立方依赖性与ZND反应长度的关系符合得很好，这可以很容易地用反应的化学动力学数据确定。实验结果也进行了比较与使用李的表面能模型，爆轰单元尺寸的经验数据是必需的。实验测量和理论模型预测之间存在良好的一致性，其中在高度氩气稀释的混合物中阐明了临界管直径的13λ关系的破裂-因此是不同的传播和引发机制，这似乎表明胞状不稳定性对稳定爆轰的引发过程没有显著影响。
In this study, direct initiation of spherical detonations in highly argon diluted mixtures is investigated. Direct initiation is achieved via a high voltage capacitor spark discharge and the critical energy is estimated from the analysis of the current output. Stoichiometric acetylene–oxygen mixtures highly diluted with 70% argon is used in the experiment. Previous investigations have suggested that detonations in mixtures that are highly diluted with argon have been shown to be “stable” in that the reaction zone is at least piecewise laminar described by the ZND model and cellular instabilities play a minor role on the detonation propagation. For the acetylene–oxygen mixture that is highly diluted with argon, the experimental results show that the critical energy where the detonation is “stable” is in good agreement with the Zel’dovich criterion of the cubic dependence on the ZND reaction length, which can be readily determined using the chemical kinetic data of the reaction. The experimental results are also compared with those estimated using Lee’s surface energy model where empirical data on detonation cell sizes are required. Good agreement is found between the experimental measurement and theoretical model prediction, where the breakdown of the 13λ relationship for critical tube diameter – and hence a different propagation and initiation mechanism – is elucidated in highly argon diluted mixtures and this appears to indicate that cellular instabilities do not have a prominent effect on the initiation process of a stable detonation.