Effect of Flame Surface Shape and Unsteady Behavior on Flame Structure of Turbulent Premixed Flames

湍流火焰用于各种各样的应用中。然而，燃烧是一个非常复杂的现象，结合了许多物理，化学过程。为了阐明这一复杂现象，我们研究了火焰表面形状和非稳态行为对湍流预混火焰火焰结构的影响，具体内容如下：1.研究工作我们总结了多台PLIF装置同时测量火焰表面形状和湍流燃烧模型的建立。2.湍流燃烧实验的进行我们建立了基于OH-HCHO PLIF技术的平面火焰瞬态图像测量系统。在此基础上，进行了湍流预混火焰结构的实验研究，考察了火焰面形状和非定常特性对火焰结构的影响.建立湍流燃烧模型的数值计算的实现我们改进了湍流燃烧模型的数值模拟装置。在此基础上，对湍流燃烧模型的建立进行了数值计算，并进行了数据分析。特别是对非定常逆流预混火焰的火焰结构进行了研究，以及当量比和火焰拉伸对甲烷-空气逆流双通道火焰结构的影响。4.湍流燃烧模型数值计算结果的燃烧实验验证湍流燃烧模型数值计算结果的燃烧实验验证研究与成果发表我们对本研究进行了总结，并在国内外会议和学术期刊上发表了研究结果。

The turbulent flame is used in a wide variety of applications. However, combustion is an extremely complex phenomenon combining a lot of physical, chemical processes. In order to elucidate such a complex phenomenon, we examined the effect of flame surface shape and unsteady behavior on flame structure of turbulent premixed flames as follows :1.Research investigationWe investigated the previous studies on the simultaneous measurement by multiple PLIF equipments and the construction of turbulent combustion model.2.Execution of the experiment for turbulent combustionWe established the measurement system for instantaneous planar flame image using simultaneous OH-HCHO PLIF technique. Then, we executed the experiment and examined the effect of flame surface shape and unsteady behavior on flame structure of turbulent premixed flames.3. Execution of the numerical calculation for construction of turbulent combustion modelWe improved the numerical simulation equipment using turbulent combustion model. Then, we executed the numerical calculation for construction of turbulent combustion model, and carried out the data analysis. Especially, we investigated the flame structure of unsteady counterflow premixed flame, and the influence of equivalence ratio and flame stretch on flame structure of methane-air counterfiow twin-premixed flames by mainpulating Lewis number.4.Verification of numerical calculation results using turbulent combustion model by combustion experimentWe verified the numerical calculation results using turbulent combustion model by combustion experiment5.Summarization of the present study and presentation of the obtained resultsWe summarized the present study, then we presented our results at the domestic and foreign conferences and the academic journals.