【摘要】 通过部分搅拌反应器(PaSR)模型数值模拟的方法，以甲烷/空气预混火焰为对象，在燃汽轮机燃烧室及热风炉等设备的典型工况下，研究了湍流-化学反应相互作用中的混合延迟效应对燃烧过程NO生成的影响规律，发现Fenimore型NO生成路径受混合延迟效应影响最剧烈，而NNH型路径对该效应不敏感．同时本文针对燃用掺氢甲烷设备的污染排放问题，对其NO生成特性展开讨论，结果发现在相同停留时间和初始温度下，氢气的加入会提高燃烧温度，热力型NO增加，同时热力型NO路径对混合延迟效应的敏感性增强，Fenimore型NO生成对延迟效应的敏感性减弱．同时，氢气的加入能够拓展可燃极限，使火焰在更低的温度下维持燃烧．在临近熄灭时，氢气的加入显著地增强了热力型NO对混合延迟的敏感性．更多还原

【Abstract】 In the present study,the partially stirred reactor（Pa SR）simulation was conducted to study the effect of mixing delay induced by the turbulence-chemistry interaction on NO formation pathways in the turbulent combustion process under the typical conditions of both gas turbine combustion chambers and gas-fired furnaces. The results show that the NO formation through the Fenimore pathway is most sensitive to the molecular mixing delay,while that through NNH pathway is just the opposite. Further analysis of the NO formation of H₂/CH₄ binary mixtures was also conducted. The results demonstrate that the H₂ addition increases the burning temperature of intensely-burning H₂/CH₄/air premixed flames and thereby increases the thermal NO formation under the same residence time and initial temperature. In addition,the H₂ addition strengthens the resistance of the flame to the flow stretch,enabling the premixed flames to burn at lower temperature. The sensitivity of thermal NO to the effect of molecular mixing delay is increased by the H₂ addition.更多还原