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Fundamental Study on The Mechanism of Turbulent Combusiton and Its Model

湍流燃烧机理及其模型的基础研究

基本信息

批准号：
04650189
负责人：
KATSUKI Masashi
金额：
$ 1.41万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04650189/
关键词：
Turbulent Combustion Premixed Combustion Flame Structure Lean Combustion Combstion Reaction Model

项目摘要

When we think of the world wide energy issue and the persistence of desirable circumstances, it is necessary to establish the scientific procedure to promate both the effective utilization of energy and the reduction of pollutant emissions. The elucidation of turbulent combustion mechanism and the control of combustion are essential for the purpose. One of the main objects of the present study is to obtain knowledge related to flame structures varying with the combination of various steps of reaction and turbulence intensity and to understand the interaction between combustion reaction and turbulence. Another object is to propose a combustion model based on the experiments which can be applied for the control of combustion. The following conclusions are obtained.1) Flame structure of a turbulent flame changes from the structure of a srinkled laminar flame into that of a distributed reaction zone when the wquivalence ratioof the mixture is decreased in spite of a weak turbulence. Low Damkoler number flames fealized by shortened mixing characteristic time scale and by increased chemical characteristic time scale showed similar flame structure.2) The fundamental feature of the propased combustion model consists of chemistry- and mixing-controlled reaction rates which vary with the local Damkoler number. The smooth time-averaged temperature profile in a typical turbulent flame can be successfully predicted by the present nodel which is dependent on the distribution of local Damkoler numbers. Since the accuracy of the model is intimately related with the local Damkoler number, hence the turbulence length scale, discussion of turbulence model inflames beeds a future study.

当我们考虑到世界范围的能源问题和理想环境的持续存在时，有必要建立科学的程序来促进能源的有效利用和减少污染物的排放。紊流燃烧机理的阐明和燃烧的控制是实现这一目标的必要条件。本研究的主要目的之一是获得有关火焰结构随不同反应步骤和湍流强度组合而变化的知识，并了解燃烧反应与湍流之间的相互作用。另一个目的是在实验的基础上提出一种可用于燃烧控制的燃烧模型。得到以下结论。1)湍流火焰的火焰结构由褶皱层流火焰的结构转变为分布反应区的结构，尽管湍流较弱，但混合气的不对称比有所降低。缩短混合特征时间尺度和增大化学特征时间尺度得到的低Damkoler数火焰火焰结构相似。2)燃烧模型的基本特征是化学控制和混合控制的反应速率随局部Damkoler数的变化而变化。该模型依赖于局部Damkoler数的分布，可以成功地预测典型湍流火焰的光滑时均温度分布。由于模型的精度与局部Damkoler数密切相关，因此湍流长度尺度，湍流模型火焰的讨论需要进一步研究。