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通过对未添加及添加1%的Br_2对氢气同向流扩散火焰的影响进行数值模拟,研究抑制剂对氢气层流扩散火焰温度及主要自由基的影响,并通过计算两种火焰的化学特征时间及混合特征时间得到Damk?hler数,提出基于抑制剂的标量耗散率,研究抑制剂的扩散作用及化学作用对氢气同向流扩散火焰的影响。研究发现抑制剂的火焰抑制循环使火焰中化学作用增强,而抑制剂的扩散作用对火焰整体的扩散作用有较显著的影响。添加抑制剂后在径向大部分区域火焰的Da数均低于未添加情况下,抑制剂减少火焰燃烧区域,并使燃烧区域的反应剧烈程度下降。从火焰根部到火焰顶端,抑制作用逐渐减弱。
The effect of inhibitor on the temperature and the main free radical of hydrogen laminar diffusion flame was studied by numerical simulation of the effect of hydrogen addition on the diffusing flame of the same direction with hydrogen added with 1% Br2. The chemical characteristic time And the mixing characteristic time to get the Damk? Hler number, based on the scalar dissipation rate of the inhibitor, the effect of the inhibitor diffusion and the chemical action on the diffusion of hydrogen to the co-current flow flame were studied. It is found that the flame inhibition cycle of the inhibitor enhances the chemical reaction in the flame and the diffusion of the inhibitor exerts a significant influence on the overall flame diffusion. After addition of inhibitor, the Da number of the flame in most of the radial directions was lower than that in the absence of the addition, the inhibitor decreased the flame combustion area and the reaction area in the combustion area decreased drastically. From the flame root to the top of the flame, inhibition gradually weakened.