Continuous/Intermittent Combustion of Liquid Fuel in Porous Body and Innovative Application to Heat Engines

近年来多孔介质的燃烧研究取得了新的进展，既有效地利用了能量，又显著减少了废气污染物的排放。然而，这些研究都或多或少地局限于气体燃料的均质预混燃烧。在这项研究中，液滴燃烧研究了详细的燃烧过程，如传热机制，蒸发，扩散和随后的燃烧。在第一年进行了实验和理论研究，以延长超稀混合物的可燃极限，并减少往复式流态多孔系统中自燃的能量输入。在第二会计年度，O-ita大学开展了扩散燃烧的标准化基础实验工作，领先于全球其他相关研究。因此，阐明了多孔体对极低NO_x排放和对低质量可燃材料的助燃作用的一些重要的突出特征。上一财政年度提出了在往复式发动机和/或燃气轮机中实现恒温膨胀燃烧的新概念，从而提高了能量与机械功率的转化率，并扩展了对热力学循环的讨论。

The recent progresses on combustion researches in porous media have brought about effective utilization of energy as well as remarkable reduction of exhaust pollutants. However, these studies have all been more or less limited to the homogeneous premixture combustion of gaseous fuel. In this study liquid droplets combustion is developed to investigate detaild combustion processes such as heat transfer mechanism, evaporation, diffusion and subsequent combustion.In first year experimental and theoretical researches have been executed to extend a flammable limit of extraordinary lean mixture and to mitigate the energy input for self-sustain combustion in the porous system of reciprocating flow regime.In second fiscal year standardized basic experimental work has been conducted in O-ita University on the diffusion combustion prior to the other related researches through the world. In consequence, some important prominent features have been elucidated the effects of porous body on the extremely low NO_x emission and also on the combustion enhancement for low quality combustible materials.In last fiscal year a new concept has been proposed to realize the constant temperature expansion combustion in reciprocating engines and/or gas turbines which results in higher energy conversion ratio to mechanical power and extended discussions on the thermodynamic cycle.