Initial flame acceleration in an explosive gas
Initial flame acceleration in an explosive gas
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爆炸性气体中的初始火焰加速
DOI：
10.1098/rspa.1962.0132
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发表时间：
1962
期刊：
影响因子：
--
通讯作者：
A. K. Oppenheim
中科院分区：
文献类型：
--
作者：
A. Laderman;A. K. Oppenheim
本文研究了爆轰管中充有化学计量比的氢氧混合物的火焰在加速初始阶段产生的压力波。通过条纹纹影照相术观察该过程，同时在管内的几个站进行压力测量。实验记录揭示了相当详细的压力波的特性，并产生了关于反应区结构的信息，该反应区具有从褶皱层流到湍流火焰的明显过渡效果。点火方式（电火花放电，化学先导火焰，热辉光线圈）的火焰加速过程中的显着影响被证明。它示出的火焰的压力波的产生可以占由燃烧前沿的表面积的增加所带来的热释放率的变化。计算得到的火焰加速度和火焰前压力波的结构与实验结果符合得很好。
The paper is concerned with pressure waves generated by a flame during the initial phase of its acceleration in a detonation tube filled with a stoichiometric hydrogen + oxygen mixture. The process was observed by means of streak schlieren photography with simultaneous pressure measurements at several stations in the tube. Experimental records revealed in considerable detail the characteristics of pressure waves and yielded information on the structure of the reaction zone with a noticeable effect of the transition from a wrinkled laminar to a turbulent flame. Marked influence of the mode of ignition (electrical obtained by spark discharge, chemical by pilot flame, and thermal by glow coil) on the process of flame acceleration was demonstrated. It is shown that the generation of pressure waves by the flame can be accounted for by the change in the rate of heat release brought about by the increase in the surface area of the combustion front. The computed acceleration of the flame and the structure of the pressure wave ahead of it were in a satisfactory agreement with experimental observation.