Abstract

The structure of the flow and temperature field behind a reflected shock wave in a shock tube is studied by numerical modeling. Two possible scenarios of the formation of the regions of elevated temperature, which are the potential ignition kernels of the gaseous mixture under the study, are demonstrated. Both scenarios are assessed as equally probable; however, depending on the parameters of the flow and diameter of the tube, one of the scenarios may be implemented earlier than the other, which is demonstrated by the example of a hydrogen–air mixture. The scenario with the ignition on the axis is the most probable one for the case of high temperatures and narrow channels, while ignition in the region of the boundary layer is implemented with a higher probability at moderate temperatures in wide channels.

中文翻译：

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激波管中核点火的两种机理

摘要

通过数值模拟研究了激波管中反射激波背后的流场和温度场的结构。演示了形成高温区域的两种可能情况，即正在研究的气体混合物的潜在着火点。两种情况均被评估为同等可能性；但是，根据管的流量和直径的参数，其中一种情况可能比另一种情况更早实施，这通过氢-空气混合物的例子得到了证明。对于高温和狭窄通道，在轴上点火的情况最可能发生，而在中等温度下在较宽通道中，边界层区域的点火可能性更高。