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The propagation of a laminar reaction front during end-gas auto-ignition

机译:终端气体自燃过程中层流反应锋的传播

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摘要

A transient, one dimensional premixed laminar reaction front is used as a model problem to further understand the physical processes influencing reaction front propagation during the various stages of spark-assisted compression ignition (SACI) combustion for both constant and variable domain pressures. This approach is consistent with the wrinkled laminar flame representation of turbulent, spark ignited engine combustion. With the proper choice of timescales and pressure rise rate, it applies to the interaction of the flame with auto-igniting end-gas in a typical automotive engine. Under the conditions simulated by a transient flame code, the reaction front begins as a deflagration, propagating into an end-gas with an initially negligible level of reaction progress. The diffusive-reactive nature of the front is maintained until significant levels of end-gas reaction progress, where the burning velocity depends upon the degree of pre-reaction. At the time of the end-gas maximum chemical power, the maximum temperature gradient and peak rate of heat conduction within the front diminish to the point where combustion becomes chemically controlled. Although significant increases in burning velocity are observed at the onset of chemically controlled combustion within the front, the end-gas is within one front time from the completion of combustion. As a result, no more than one front thickness is consumed by the apparent propagation of the spontaneous ignition front.
机译:瞬态一维预混合层流反应前沿被用作模型问题,以进一步了解在恒定和可变域压力下火花辅助压缩点火(SACI)燃烧的各个阶段中影响反应前沿传播的物理过程。这种方法与湍流,火花点燃的发动机燃烧的皱纹层流火焰表示相一致。通过适当选择时间刻度和压力上升率,它可应用于典型汽车发动机中火焰与自燃终端气体的相互作用。在瞬态火焰代码模拟的条件下,反应前沿从爆燃开始,传播到最终气体中,反应进展程度可忽略不计。前沿的扩散反应性一直保持到最终气体反应显着发展,燃烧速度取决于预反应的程度。在最终气体达到最大化学功率时,前部内部的最大温度梯度和热传导峰值速率将减小到化学控制燃烧的程度。尽管在前部化学控制燃烧开始时观察到燃烧速度显着提高,但最终气体在燃烧完成后的一个前部时间内。结果,自发点火锋的明显传播消耗了不超过一个的锋锋厚度。

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