Clarification and Verification of Turbulent Flame by Combination Method Based on Extended Flamelet Model

紊流火焰的应用非常广泛。然而，燃烧是一种结合了许多物理、化学过程的极其复杂的现象，目前还没有得到足够的阐明。为了准确预测湍流NOx排放，提出了基于“扩展火焰模型”的组合预测方法。在该方法中，将详细的动力学计算与湍流计算分离，然后根据重组参数将它们重新组合。另一方面，在实验中采用了迄今为止积累的仪器技术，解决了在图像处理上拍照速度快、分辨率不高的问题。基于这些技术进行了以下研究。1)紊流模型和紊流燃烧模型方法综述2)非定常逆流扩散火焰组合方法改进及数值计算执行3)高速高分辨率测量系统的建立4)OH-PLIF和丙酮- plif实验对组合方法进行验证5)DNS数值计算执行及与实验对比

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 and enough elucidation is not yet done. In order to predict accurately the NOx emission of turbulent, we developed the combination method based on "the extended flamelet model". In this method, the detailed kinetics calculation is separated from the turbulent flow calculation, and then they are recombined in terms of recombination parameters. On the other hand, the instrumentation technology which had accumulated up to now was adopted to cope with the problems of taking a picture to the fast process and the resolution on the image processing in the experiment.Following researches were done based on such techniques.1)Survey on the method using the turbulent flow model and the turbulent combustion model2)Improvement of the combination method and execution of the numerical calculation for the unsteady counterflow diffusion flame3)Establishment of the measurement system with the high speed and the high-resolution4)Execution of the experiment using OH-PLIF and acetone-PLIF for verification of the combination method5)Execution of the numerical calculation using DNS and comparison with the experiment