超声速可压缩湍流与燃烧耦合作用的建模与分析

项目名称： 超声速可压缩湍流与燃烧耦合作用的建模与分析

项目编号： No.11202014

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 高振勋

作者单位： 北京航空航天大学

项目金额： 22万元

中文摘要： 目前，对超声速流动中湍流与燃烧耦合作用的研究较为缺乏。一方面可描述超声速流动中湍流脉动对化学反应影响的可压缩湍流－燃烧封闭模型尚未发展成熟；另一方面燃烧放热对湍流发展的抑制作用尚未在超声速燃烧RANS数值模拟中得到考虑，迫切需要发展相应的可压缩燃烧－湍流模型。本项目结合数值模拟与理论分析，提出开展超声速流动中湍流与燃烧耦合作用的建模与分析研究。研究工作在分析流动可压缩效应对火焰内部结构影响机理的基础上，结合现有针对低速流动、扩散燃烧发展的湍流－燃烧模型，提出一种新的可压缩修正形式，以建立可用于模拟复杂流动的可压缩湍流－燃烧模型。另外，利用现有实验数据以及DNS模拟结果，研究燃烧放热效应对湍流结构影响的物理机理，建立可反映燃烧放热对湍流抑制作用的可压缩燃烧－湍流模型。针对所建立的可压缩湍流－燃烧模型和燃烧－湍流模型，开展在典型超声速燃烧流动中的应用研究，并分析流场中湍流与燃烧的耦合作用特征

中文关键词： 超声速湍流燃烧；火焰面模型；燃烧放热效应；超燃冲压发动机；计算流体力学

英文摘要： The research on the interaction between turbulence and combustion in supersonic flows is relatively scarce currently. On the one hand, the compressible turbulence-combustion model, which can describe the influence of the turbulent fluctuations on the chemical reactions in supersonic flows, has not been developed maturely. On the other hand, the suppression effect of the combustion heat release on the turbulence development has not been considered in the current RANS simulation of supersonic combustion, and hence it is urgently needed to develop the corresponding compressible combustion-turbulence model. Based on numerical simulation and theoretical analysis, the modeling and analysis of the interaction between turbulence and combustion in supersonic compressible flows is conducted. The influence mechanism of the flow compressibility on the flame inner structure is analyzed at first, and a new type of compressibility correction is developed based on the traditional turbulence-combustion model which is designed for low-speed flows and non-premixed combustion. Then, the compressible turbulence-combustion model adequate for complex flows can be established. Furthermore, utilizing the available experimental data and DNS results, the physical mechanism of the combustion heat release effect on turbulence is studied, an

英文关键词： supersonic turbulent combustion；famelet model；combustion heat release effects；scramjet engine；CFD