中文摘要：

以美国麻省理工学院（MIT）研制的硅基六晶片微燃烧器为研究对象，采用考虑了基元反应动力学机理燃烧程序的二维计算流体动力学（CFD）数值分析方法，研究了在微尺度燃烧器入口处混合气体流量不变的情况下，改变氢气/空气当量比对微尺度燃烧器燃烧特性的影响。整个模拟计算主要包括混合气体的流动路径、微燃烧器的内部区域以及整个燃烧器的墙壁面；计算过程中考虑了氢气／空气的流体动力学特性、传热学特性和详细的基元反应机理。计算结果显示，当氢气／空气当量比为0．4时，燃烧器发生熄火；当量比为0．5、0．6时，燃烧器内部能维持稳定燃烧；当量比为0．7时，燃烧器的微细通道内出现回燃现象。结果表明，利用二维CFD数值模拟的方法研究微尺度燃烧器燃烧特性是可行的。

英文摘要：

On the basis of the six-wafer combustor used in a micro-gas turbine engine developed by Massachusetts Institute of Technology （MIT）, a two-dimensional Computational Fluid Dynamics （CFD） simulation was employed in studying the effect of hydrogen/air ratio on the combustion per-formance in a micro combustor when the mixture mass flow rate was fixed. The CFD modeling includes the hydrogen/air flow path, combustion chamber as well as the solid walls of the micro-combustor, and the simulation analysis involves in the flow mechanics, heat transfer and the numerous chemical reactions occuring in the micro-combustor. The results show that the flame will be quenched finally in the chamber when the equivalence ratio of fuel/air mixture is 0.4 and the combustion is more stable when the equivalence ratio of fuel/air mixture is 0. 5 or 0. 6;the flame front will propagate to the upstream of the fuel/air mixture flow, burning in the recirculation jacket when the equivalence ra-tio is increased to 0. 7. It comes to a conclusion that the present numerical simulation is helpful for the design and improvement of the micro-combustor.