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Development of large eddy simulation for turbulent combustion flows

湍流燃烧流大涡模拟的发展

基本信息

批准号：
11305017
负责人：
KOBAYASHI Toshio
金额：
$ 26.53万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

项目摘要

This research aimed a development of large eddy simulation (LES) for turbulent combustion flows for the advanced design of combustors of energy plants or gas turbines. Based on the flamelet assumption which was developed in time-averaged turbulence modeling, LES methods and their subgrid scale (SGS) model are developed for various types of turbulence flames and the combined combustion flows. A dynamic SGS model is introduced into the turbulent flame models. As practical applications, prediction method for NO production in turbulent flames and combustion model of spray fuels are investigated based on the above LES modeling. For the practical LES of combustion flows, turbulence models and their numerical methods are developed based on the finite difference and finite element for the complex geometry. Some new results are reported with proposals of non-equilibrium SGS model for scalar transport, wall boundary layer approximation combined with the time-average turbulence models and numerical treatment of inlet velocity fluctuations in jet flows. Since very few cases were reported on instantaneous structures and unsteady scalar transport phenomena in turbulence combustion flows, advanced visualization methods are developed and applied to the basic burner flows. Dynamics and interaction of small scale eddy structures are also investigated using the database of direct numerical simulation. A computer code based on the above researches is probed on the practical problems, as NO prediction in diffusion flame, lift-up flame of combustion burner flow prediction in diesel engine cylinder, and premixed flame propagation in multi-stage combustor of advanced gas turbine.

这项研究的目的是开发湍流燃烧流的大涡模拟 (LES)，以实现能源工厂或燃气轮机燃烧室的先进设计。基于时间平均湍流建模中提出的火焰假设，针对各种类型的湍流火焰和组合燃烧流开发了 LES 方法及其亚网格尺度 (SGS) 模型。湍流火焰模型中引入了动态SGS模型。作为实际应用，基于上述LES模型，研究了湍流火焰中NO生成的预测方法和喷雾燃料的燃烧模型。对于燃烧流的实用 LES，基于复杂几何形状的有限差分和有限元，开发了湍流模型及其数值方法。报告了一些新的结果，包括标量输运的非平衡 SGS 模型、壁边界层近似与时均湍流模型相结合以及射流入口速度波动的数值处理。由于关于湍流燃烧流中的瞬时结构和非稳态标量输运现象的报道很少，因此开发了先进的可视化方法并将其应用于基本燃烧器流。还使用直接数值模拟数据库研究了小尺度涡流结构的动力学和相互作用。基于上述研究的计算机代码针对扩散火焰中的NO预测、柴油机缸内燃烧器的升力火焰流动预测、先进燃气轮机多级燃烧室中的预混火焰传播等实际问题进行了探讨。