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Investigation of Turbulent Flame Propagation Mechanism and Development of Turbulent Combustion Model

湍流火焰传播机制研究及湍流燃烧模型发展

基本信息

批准号：
18560204
负责人：
KITAGAWA Toshiaki
金额：
$ 2.39万
依托单位：
Kyushu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18560204/
关键词：
Turbulent Flame Burning Velocity Combustion Model Flame Stretch Pressure Markstein Number Lewis Number レイノルズ数シミュレーションエンジン

项目摘要

In order to develop universal turbulent combustion model applicable at elevated pressures for a lot of fuels having various combustion properties such as laminar burning velocity, laminar and turbulent combustion was studied for gaseous fuels of hydrogen, methane, propane, and liquid fuel of iso-octane. Laminar burning velocities, Markstein numbers and turbulent burning velocities were obtained for lean to rich mixtures of these fuels at 0.10 to 0.50MPa.The ratio of turbulent burning velocity to unstretched laminar burning velocity was found to depend on the turbulence Reynolds number, the ratio of turbulence intensity to unstretched laminar burning velocity, and the Markstein number. Among these three dominant factors, the turbulence Reynolds number and the Markstein number were reduced to one factor of the combination of the turbulence Reynolds and Lewis numbers, the turbulence Reynolds number divided by the square of the Lewis number. After all, turbulent burning velocities at various pressures were found to correlate with two parameters of the ratio of turbulence intensity to unstretched laminar burning velocity, and the turbulence Reynolds number divided by the square of the Lewis number. In addition to the above results, turbulent burning velocity at a constant Peclet number was found to correlate with the Karlovitz number. In all results in this study, thermo-diffusive effects were found to affect turbulent flames.Finally, variations of turbulent burning velocity during explosions were formulated in terms of flame radius. The coefficient in the formulation was found to depend on the turbulence Reynolds number, the ratio of turbulence intensity to unstretched laminar burning velocity, and the Markstein number.

为了建立适用于具有不同燃烧特性（如层流燃烧速度）的多种燃料的通用高压湍流燃烧模型，对氢气、甲烷、丙烷等气体燃料和异辛烷等液体燃料的层流和湍流燃烧进行了研究。在0.10 ~ 0.50MPa范围内，得到了稀燃和浓燃的层流燃烧速度、Markstein数和湍流燃烧速度，发现湍流燃烧速度与层流燃烧速度之比取决于湍流雷诺数、湍流强度与层流燃烧速度之比以及Markstein数。在这三个主导因素中，湍流雷诺数和Markstein数被简化为湍流雷诺数和刘易斯数的组合的一个因素，即湍流雷诺数除以刘易斯数的平方。毕竟，在各种压力下的湍流燃烧速度被发现与湍流强度与未拉伸层流燃烧速度的比率和湍流雷诺数除以刘易斯数的平方这两个参数相关。除上述结果外，还发现在Peclet数一定时湍流燃烧速度与Karlovitz数有关。在本研究的所有结果中，热扩散效应被发现会影响紊流火焰。最后，紊流燃烧速度在爆炸过程中的变化被表示为火焰半径。公式中的系数取决于湍流雷诺数、湍流强度与未拉伸层流燃烧速度的比值以及Markstein数。