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首页> 外文会议>US National Combustion Meeting >Evolution and Morphology of Globally-Spherical and Bubble-Shaped Accelerating Deflagration Fronts: Stability, Dynamics and Possibility of Detonation Triggering
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Evolution and Morphology of Globally-Spherical and Bubble-Shaped Accelerating Deflagration Fronts: Stability, Dynamics and Possibility of Detonation Triggering

机译：全球球和泡形加速透气铅展示的演化与形态：稳定性，动力学和爆轰触发的可能性

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Dynamics of outwardly-propagating reaction fronts inspires both fundamental and practical interests. While for the former we can mention in pass supernovae explosions and measurements of laminar flame speeds of reactive mixtures, the latter is relevant to the operation of engines and prevention of spark-initiated hazards such as accidental or intentional explosions. While a pointy-ignited, expanding premixed flame front is initially smooth, it is subsequently gets corrugated by diffusional-thermal (cellular or pulsating) instability. Eventually, with the flame thickness being reduced as compared to the global flame radius, the onset of hydrodynamic instability initiates the continuous production of cascades of cells over the flame surface, which increases the total flame surface area as compared to the respective spherical flame. Hence, the flame accelerates. The present study is devoted to the latter, self-accelerative stage of expanding flame propagation. Based on the logarithmic transformation of Akkerman et al. [PRE 83 (2011) 026305], we develop a self-similar formulation on accelerative propagation of wrinkled flames, describing the relevant dynamic and scalar fields, namely, the velocity and temperature profiles in the fresh medium. We next consider trajectories of fresh gas particles and analyze the possibility of detonation initiation through the heating transfer ahead of the accelerating flame front by the compression waves generated ahead of it.
机译：向外传播反应前线的动态激发了基础和实用的兴趣。虽然前者我们可以提到通过Supernovae爆炸和反应混合物的层状火焰速度的测量，但后者与发动机的操作和预防火花发起的危险的操作相关，例如意外或有意的爆炸。虽然尖点点燃，膨胀预混火焰前沿最初是光滑的，但随后通过扩散 - 热（蜂窝或脉动）不稳定性瓦楞瓦楞。最终，由于与全局火焰半径相比，由于全局火焰半径减小，流体动力稳定性的开始引发了与相应的球形火焰相比的总火焰表面区域的连续产生的电池级联的连续产生。因此，火焰加速。本研究致力于扩大火焰繁殖的后者，自我加速阶段。基于Akkerman等人的对数转换。 [Pre 83（2011）026305]，我们在皱纹火焰的加速传播中发展自相似的配方，描述了相关动态和标量场，即新鲜介质中的速度和温度曲线。我们接下来考虑新鲜气体颗粒的轨迹，并通过在前方提前产生的压缩波之前通过加热转移来分析通过加热转移的爆轰起始的可能性。

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