Behavior of detonation propagation in mixtures with concentration gradients
Behavior of detonation propagation in mixtures with concentration gradients
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DOI：
10.1007/s00193-007-0093-y
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发表时间：
2007-07
期刊：
影响因子：
2.2
通讯作者：
K. Ishii;M. Kojima
中科院分区：
文献类型：
--
作者：
K. Ishii;M. Kojima
通过实验研究了浓度梯度垂直于传播方向的混合物中爆轰波的行为。通过滑动分隔板形成具有各种浓度梯度的混合物，该分隔板将爆炸室与最初引入扩散气体的扩散室分开。在爆炸室中充入化学计量的氢氧混合物，而在扩散气体室中充入氧气或氮气。使用乙烷代替氧，通过红外吸收法进行时间浓度测定。烟熏箔记录显示规则菱形细胞变形为平行四边形细胞，这很好地对应于局部混合物浓度。纹影照片显示了倾斜的波阵面，其角度与从三相点轨迹获得的爆炸阵面的偏转角一致。局部偏转角随着局部浓度梯度的增加而增加。基于射线追踪理论的波轨迹计算预测了从初始平面波前形成倾斜波前。
Behavior of detonation waves in mixtures with concentration gradients normal to the propagation direction was studied experimentally. Mixtures with various concentration gradients were formed by sliding the separation plate which divides a detonation chamber from a diffusion chamber in which a diffusion gas was initially introduced. A stoichiometric hydrogen–oxygen mixture was charged in the detonation chamber, while oxygen or nitrogen was filled in the diffusion gas chamber. Temporal concentration measurement was conducted by the infrared absorption method using ethane as alternate of oxygen. Smoked foil records show a deformation of regular diamond cells to parallelogram ones, which well corresponds to local mixture concentration. Schlieren photographs reveal the tilted wave front whose angle is consistent with the deflection angle of the detonation front obtained from trajectories of the triple point. The local deflection angle increases with increase in local concentration gradient. Calculation of wave trajectory based on the ray tracing theory predicts formation of the tilted wave front from an initial planar front.