2007-06-012024-05-17https://scholars.lib.ntu.edu.tw/handle/123456789/680290摘要：由於石油短缺，且其他替代能源如太陽能及燃料電池尚未能有效應用，氫燃料的直接燃燒將為近期一重點能源。然而因為氫氣的易燃、高傳播及反應性、與安全性考量，其燃燒現象相當迴異於一般化石燃料，因此在實質應用前需仔細研究。本計畫將探討球形及平面火焰的作動現象，其傳播行為是內燃引擎中的重要機制，不適當的燃燒會引發爆震、低效率、污染物生成如氮氧化物或煤灰，其間的結構即與此種火焰行為密切關連。我們計畫由火焰傳播的動力機制著手，研究火焰加速的原因與機構，期能發掘主導參數之關係並歸納有效準則，以供設計人員做改善依據，並藉此作為氫能源實質應用於燃燒的範本，眾多相關設備如航太推進器、燃燒及焚化爐、家用熱水器等皆可由此理論模型作為初步設計考量。<br> Abstract: Energy is one of the most challenging issues in this century. In view of the shortage and pollution associated with petroleum, the major power source on earth, it is critical to search for substitutes. In spite of the promising potential of fuel cell, solar energy, and other renewable sources, the immediate need will still rely on combustion. Due to its high percentage out of the total power generation, a little increase in burning efficiency shall make substantial effect. Specifically, direct burning of hydrogen will mitigate the severity of green house effects and other pollutions, and hence shall be a potential candidate in near future. In this project, we propose to study the dynamics of flame propagation, particularly for outward expansion of spherical flames. Since later acceleration of the flame speed is a key mechanism to the occurrence of explosion, understanding of the fundamental structure is crucial for the issues of safety and operation of flammable reactants. Particularly when hydrogen is utilized, burning shall be concerned with its high diffusivity, strong reactivity, and fast propagation speed. Starting from a canonical approach, we aim to extract general or universal laws that govern the motions of flames, which can then be correlated to practical situation as that for hydrogen and/or its mixture with other hydrocarbons.火焰不穩定性球形火焰傳播氫燃燒flame-front instabilityoutward propagating flamehydrogen combustion