서강대학교

초록/요약

Understanding of micro-scale combustion mechanism is very essential to the development of combustion-based micro-power devices, which may supply much higher energy density than the batteries used nowadays. Accordingly, this thesis can be divided into three parts: (1) Computational Fluid Dynamics (CFD)-based numerical simulations have been performed to study the mixedness and combustion of non-premixed hydrogen？air gases in a chambers with same shape aspect ratio but various fuel injectors. And (2) a numerical simulation of combustion have been performed with combustion efficiency. (3) The transition of the combustion phenomena in the chambers from relatively large scale to micro-scale has been studied numerically to investigate the micro-combustion mechanism. In appendix of this paper, using a Swiss-roll combustor configuration, excess enthalpy combustion can be conveniently achieved. In this work, the combustors were tested using hydrogen/methane/air/oxygen mixtures of various equivalence ratios. Both temperature distributions and extinction limits were determined for each combustor configuration at different methane mass flow rates. Results indicate that the combustors developed in the current study greatly enhance combustion stability in center regions of the combustors