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Structure and Dynamic Behavior of Flamelet with Strain as Turbulent Combustion Elementary Process

湍流燃烧基本过程应变小火焰的结构与动态行为

基本信息

批准号：
15360111
负责人：
KOMIYAMA Masaharu
金额：
$ 5.57万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

项目摘要

The turbulent flame consists of the flamelet that receive the strain, and it is useful to clarify the structure and the dynamic behavior of the flamelet for understanding the structure and characteristics of turbulent flame, and establishing a reasonable analytical technique. Therefore, this research aims by an experiment and a direct numerical analysis to clarify flame structure, the extinction characteristics under the control of the flame strain, the structure and dynamic behavior of the edge flame caused by local extinction, which is related to the positive and negative flame strain rate, curvature effect, preferential diffusion, unsteadiness and locality of strain rate.(1)By the numerical analysis that considers elementary chemical reaction and multi-component diffusion of the opposing-flow laminar diffusion flame that uses hydrogen and the methane as a fuel, the strain rate and the flow are controlled by changing the opposing flow velocity and by injecting a jet locally, the rela … More tion among extinction, the strain rate, and the flow fields was analyzed.(2)The flow velocity fluctuation by the sound excitation was given to the fuel or air for the normal diffusion flame and the inverse-diffusion flame of a central jet flow, the flame with a large-scale vortex was formed, and the interacting behavior of the vortex and the flame was analyzed by two dimensional measurement of the temperature and the OH concentration profiles by the Rayleigh scattering and the laser-induced fluorescence.(3)The influence was computationally analyzed, which the interaction between a flame and a vortex gives on flame structure and extinction. When the fluctuation of fuel velocity relatively is weak and the flame does not result in extinction, the preferential diffusion between species and the Lewis-number effect give a large influence on the temperature characteristic of the flame. When the velocity fluctuation is large, the heat release rate decreases with the process of the chemical non-equilibrium, and it results in extinction. Less

湍流火焰是由接受应变的火焰片组成的，弄清火焰片的结构和动力学行为，有助于了解湍流火焰的结构和特性，建立合理的分析技术。因此，本研究通过实验和直接的数值分析来阐明火焰结构、火焰应变控制下的熄火特性、局部熄火引起的边缘火焰的结构和动力学行为，它与正、负火焰应变率、曲率效应、优先扩散、不稳定性和应变率的局部性有关。(1)通过考虑以氢和甲烷为燃料的对流层流扩散火焰的基本化学反应和多组分扩散的数值分析，通过改变反向流速和局部喷射来控制应变率和流量，Rrela…分析了消光、应变率和流场之间的关系。(2)对正向扩散火焰和中心喷流逆扩散火焰，在声激励作用下对燃料或空气进行流速脉动，形成大尺度旋涡火焰，通过瑞利散射和激光诱导荧光对火焰温度和OH浓度分布的二维测量，分析了旋涡与火焰的相互作用行为。(3)计算分析了火焰与旋涡的相互作用对火焰结构和熄火的影响。当燃料速度脉动相对较弱且火焰不会熄灭时，物种间的优先扩散和Lewis数效应对火焰的温度特性有较大的影响。当速度波动较大时，放热率随着化学非平衡的过程而降低，从而导致消光。较少