稀甲烷/氢气预混湍流传播火焰实验研究

本文采用定容湍流燃烧弹获取了稀甲烷/氢气/空气在强湍流条件下的火焰发展历程,研究了湍流火焰在负马克斯坦数条件下的传播特性.结果表明,湍流火焰呈现自相似传播特性,即使在强湍流条件下,湍流传播火焰仍然会受到不稳定性的影响.并且随着马克斯坦数的减小,不稳定性对湍流传播火焰的影响增强。同时,本文获得一种新的湍流燃烧速度拟合公式,包含了负马克斯坦数条件下不稳定性对湍流燃烧速度的影响。

Experimental Research on Expanding Turbulent Flames of Lean Methane/Hydrogen/Air Mixtures

Evolution of expanding turbulent flames of lean methane/hydrogen/air mixtures under strong turbulence intensity was obtained using a constant volume,fan-stirred turbulent combustion chamber.And the turbulent flame propagation characteristics were investigated under negative Markstein number conditions.It is found that the propagation of expanding flame is self-similar.The flame propagation is affected by flame instability even unthin intense turbulence.Furthermore,the effect of instability on expanding turbulent flame increases as the decreasing of Markstein number.A new correlation for turbulent burning velocity is obtained with the consideration of the flame instability effect under negative Markstein number conditions.