Numerical simulation on turbulent flame propagation in premixed gas deflagration process in a tube will be reported in this paper, aiming at identifying the key factors affecting flame shape and flame velocity. Large eddy simulation with premixed gas combustion model is used to obtain results validated by full-scale experimental data. The effect of flow velocity and turbulence on flame propagation is discussed. The flow velocity of premixed gas is observed to be one of the main factors determining flame shape and affecting flame propagation process. The velocity difference of different parts of the flame front, both in magnitude and direction, will lead to tulip-shaped flame. Turbulence would accelerate the propagation of flame periodically. The cause of flame acceleration of low-intensity turbulence originates from two factors, namely, combustion and flow field, which transfer the heat and mass of chemical reaction from diffusion to vortex transport. As high-intensity turbulence will not affect the chemical reaction and the turbulent burning velocity, flame acceleration is controlled only by the characteristics of the flow field.

中文翻译：

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管内预混合气体爆燃中湍流火焰传播的数值研究

本文将对管内预混合气体爆燃过程中湍流火焰传播的数值模拟进行报道，旨在确定影响火焰形状和火焰速度的关键因素。使用带有预混气体燃烧模型的大涡模拟来获得通过全面实验数据验证的结果。讨论了流速和湍流对火焰传播的影响。预混合气体的流速是决定火焰形状和影响火焰传播过程的主要因素之一。火焰前沿不同部分的速度差（大小和方向）都将导致郁金香形火焰。湍流会周期性地加速火焰的传播。低强度湍流火焰加速的原因有两个，即 燃烧和流场，将化学反应的热量和质量从扩散传递到涡流传输。由于高强度湍流不会影响化学反应和湍流燃烧速度，因此火焰加速度仅受流场特性的控制。