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.

为了开发适用于高架压力下的通用湍流燃烧模型，用于许多具有各种燃烧性能的燃料，例如层状燃烧速度，层层和湍流燃烧，用于氢，甲烷，丙烷和液体燃料的气态燃料。获得层状燃烧速度，麦克斯坦数量和湍流的燃烧速度，以倾斜到0.10至0.50mpa的倾斜到丰富的混合物。发现湍流燃烧速度与无牵引力的层状层状燃烧速度的比率取决于湍流的爆炸性，燃烧的程度，呈湍流的繁殖力，繁殖范围，繁殖力远高于湍流，远洋远处依赖性，并依赖于湍流的范围，远洋远不受欢迎。马克斯坦号。在这三个主要因素中，湍流雷诺数和马克斯坦数量减少到湍流雷诺和刘易斯数的组合的一个因素，湍流雷诺数数除以刘易斯数的平方。毕竟，发现各种压力下的湍流燃烧速度与湍流强度与未伸展的层流燃烧速度之比的两个参数相关，而湍流雷诺数则除以刘易斯数量的正方形。除上述结果外，还发现在恒定的小子数下的湍流燃烧速度与Karlovitz数字相关。在这项研究的所有结果中，都发现热 - 散热作用会影响湍流的火焰。在最后，爆炸过程中湍流燃烧速度的变化是根据火焰半径表达的。发现配方中的系数取决于湍流雷诺数，湍流强度与未拉伸的层流燃烧速度的比率和Markstein数字。