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arXiv 1210.8041physics.flu-dyn
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开口管内壁面摩擦引起火焰加速的分析

Analysis of flame acceleration induced by wall friction in open tubes

V'yacheslav Akkerman, Chung K Law, Vitaly Bychkov, Lars-Erik Eriksson

摘要:

对开口管/通道中由于壁面摩擦引起的火焰自发加速引发爆炸进行了分析和计算研究。它首先证明了加速的影响时,整个火焰的热膨胀超过一个临界值取决于燃烧配置。针对两端开口圆柱管内轴对称火焰传播问题,提出了准等压极限下火焰初始(指数)加速阶段的理论,并通过对流体动力学和Arrhenius反应燃烧过程的数值模拟得到了验证。的火焰形状,速度和加速度速率,以及速度分布的火焰前面和后面的动态,已被确定。

英文摘要:

Spontaneous flame acceleration leading to explosion triggering in open tubes/channels due to wall friction was analytically and computationally studied. It was first demonstrated that the acceleration is effected when the thermal expansion across the flame exceeds a critical value depending on the combustion configuration. For the axisymmetric flame propagation in cylindrical tubes with both ends open, a theory of the initial (exponential) stage of flame acceleration in the quasi-isobaric limit was developed and substantiated by extensive numerical simulation of the hydrodynamics and combustion with an Arrhenius reaction. The dynamics of the flame shape, velocity, and acceleration rate, as well as the velocity profile ahead and behind the flame, have been determined.

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