Abstract The paper analyses numerically the scenarios of ignition kernels formation in the shock tube in the intermediate temperature range. Three modes of mild ignition are distinguished among which are: ignition related to the shear heating in the developed boundary layer, ignition due to the shear heating in the recirculation zone behind the reflected shock and ignition in the central region of the tube due to the axial compression. All three modes define short ignition delays at low temperatures compared to the ideal shock-tube values. Moreover, it is shown that the gas-dynamic mechanisms responsible for additional local heating of the test mixture provide close rates of heating. As a result, all the data on ignition delays fall in a certain range defined by the mixture composition and pressure, independent on the particular mode of mild ignition.

中文翻译：

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激波管中的轻度点火模式：起源和分类

摘要 数值分析了激波管在中间温度范围内形成点火核的情景。温和点火的三种模式分别是：与发达边界层中的剪切加热有关的点火，由于反射激波后面的再循环区的剪切加热而引起的点火，以及由于轴向作用而在管子中心区域的点火。压缩。与理想的冲击管值相比，所有三种模式都定义了低温下的短点火延迟。此外，还表明负责对测试混合物进行额外局部加热的气体动力学机制提供了接近的加热速率。因此，点火延迟的所有数据都落在由混合物成分和压力定义的特定范围内，