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The kinetic effects of H 2  addition on the thermal characteristics of laminar methane diffusion flames were numerically studied using a detailed chemical kinetics consisting of 53 species and 325 reactions. The variations in the heat release properties and relevant key reactions with H 2  addition were analyzed. Results show that the reactions of H + O 2  + H 2 O ⇔ HO 2  + H 2 O (R35), H + HO 2  ⇔ OH + OH (R46), H + CH 3  (+ M) ⇔ CH 4  (+ M) (R52) and OH + H 2  ⇔ H + H 2 O (R84) present important roles in the global heat release and the contributions of these reactions significantly increased as H 2  is added to CH 4  stream. Moreover, the increase rate of contribution of R84 with H 2  addition is much larger than those of the reactions of R35, R46 and R52. The H and OH are the two most important radicals for heat release in the combustion process of CH 4 -H 2  diffusion flame. The reaction of R84 is one of the main contributors for production of H radical and the contribution of R84 significantly increased with H 2  addition, while the reaction of H + O 2  ⇔ O + OH (R38) dominates the contribution of production of OH, which contributes more than 50 %, no matter whether H 2  is added to CH 4  stream.

Numerical Study on the Kinetic Effects of Hydrogen Addition on the Thermal Characteristics of Laminar Methane Diffusion Flames