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Measurement of Local Structure of Turbulent Premised Flame by Using an Ion Probe Method and Laser Ibmography

离子探针法和激光成像技术测量湍流预设火焰的局部结构

基本信息

批准号：
13650223
负责人：
YOSHIYAMA Sadami
金额：
$ 2.24万
依托单位：
OKAYAMA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650223/
关键词：
Turbulent Premixed Flame Premixed Combustion Spark Ignition Engine Burning Velocity Flame Curvature Combustion Model Ion Current Laser aided Measurement

项目摘要

Generally the flame structure of turbulent premixed flames is expressed as a wrinkled laminar flame model Therefore the burning rate is expressed as a function of the local burning velocity and the flame surface area In our previoia studies the fractal burning model for modeling a flame surface area was used for the simulation of turbulent propagation process in a spark ignition engine. However as the local burning velocity is affected by the flame stretch and flame curvature, the local velocity is changed from the laminar burning velocity. The local burning velocity model is essential for modeling die turbulent burning model In present study the effect of the analyzing area on the PDF distribution of flame curvature was investigated. When the flame curvature is obtained from the flame geometry, the optimal analyzing area must be chosen. As the turbulence intensity increase, the mean radius of flame curvature decreases and the PDF distribution of flame curvature becomes to be axial symmetry. It was found that the non-dimensional radius of flame curvature is expressed as a function of the non-dimensional turbulence intensity considered the mixture density.The characteristic value of flame thickness was measured by using ion probe method Tte flame Ihiclmess measured by ion probe method was compared with the thickness of preheat zone. It was confirmed that the thickness obtained by ion probe method is proportional to the thickness of the preheat zone of the laminar flame.In the future study the laser tomography and ion probe method simultaneously are applied for the measuring the flame structure of turbulent premised flames.

湍流预混火焰的火焰结构一般用褶皱层流火焰模型来表示，因此燃烧速率是局部燃烧速度和火焰表面积的函数。在我们以前的研究中，我们用分形燃烧模型来模拟火焰表面积，模拟了火花点火发动机中的湍流传播过程。但由于局部燃烧速度受火焰拉伸和火焰曲率的影响，局部燃烧速度偏离层流燃烧速度。局部燃烧速度模型是湍流燃烧模型的基础。本文研究了分析区域对火焰曲率PDF分布的影响。由火焰几何形状求取火焰曲率时，必须选择最佳分析区域。随着湍流强度的增加，火焰曲率半径减小，火焰曲率PDF分布趋于轴对称。在考虑混合物密度的情况下，火焰曲率半径的无因次表达式为无因次湍流强度的函数，用离子探针法测量了火焰厚度的特征值，并将离子探针法测量的火焰厚度与预热区厚度进行了比较。证实了离子探针法测得的厚度与层流火焰预热区的厚度成正比，在未来的研究中，激光层析成像和离子探针法同时应用于湍流湍流火焰的火焰结构测量。