A Study on Combustion Enhancement Methods of Micro-scale Laminar Flames for Ultra-micro combustors taking Molecular diffusivity into consideration

本文定性地研究了在火焰半径rf <5mm范围内，燃料和稀释气体的分子扩散系数对微尺度球形层流火焰燃烧速度特性的影响，以探讨微尺度火焰的燃烧强化方法。在层流燃烧速度相同的贫燃混合气中，对于分子扩散系数较大的燃料氢气和分子扩散系数较小的稀释气体二氧化碳，其微尺度火焰的燃烧速度有提高的趋势。

This study investigated qualitatively the influence of molecular diffusivities of fuel and dilution gas as composing mixtures on burning velocity characteristics of micro-scale spherical laminar flames in the range of flame radius r_f<5mm, in order to examine combustion enhancement methods of micro-scale flames. It was clarified in lean mixtures having the same laminar burning velocity that as for fuel hydrogen with the larger molecular diffusivity as compared with methane and propane, and as for dilution gas carbon dioxide with the smaller molecular diffusivity as compared with nitrogen and argon had the tendency to improve its burning velocity of micro-scale flames.