Ignition Characteristics of Premixed Methane/air in Micro Chamber

14th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications

物理学;能源学

Yang, H.L.^1 ; Huo, J.P.^1 ; Jiang, L.Q.^1 ; Wang, X.H.^1 ; Zhao, D.Q.^1

Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, China^1

关键词: Elementary reaction;    Gas-phase reactions;    Ignition characteristics;    Ignition delay time;    Initial temperatures;    Micro-scale chambers;    Sticking coefficients;    Stoichiometric ratio;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/557/1/012018/pdf
DOI  :  10.1088/1742-6596/557/1/012018

来源: IOP

【 摘 要 】

The ignition process of premixed methane/air in a micro-scale chamber is simulated with the combination of surface chemistry and gas-phase reactions. The effect of different parameters on the ignition characteristics are analyzed in detail and the sensitive analysis is performed on main elementary reactions. It is found that the ignition of the mixture is inhibited by surface reaction, which mainly depends on the sticking ability of the surface on CH3 radical. The ignition inhibition can be reduced by increasing the initial temperature and pressure. The increase of equivalence ratio has small impact on ignition delay time when it is larger than stoichiometric ratio. The ignition delay time would increase significantly with surface-area-to- volume ratio. The product of sticking coefficient and surface-area-to-volume ratio can be used to measure the intensity of surface reaction. The larger the product is, the stronger the inhibition of the surface reaction on ignition has.