旋流燃烧室内湍流-反应相互作用的数值模拟  

Numerical simulations of turbulence-reaction interactions in a swirl combustor

作　　者：陈莹[1] 张健[1] 

机构地区：[1]清华大学工程力学系,北京100084

出　　处：《清华大学学报（自然科学版）》2013年第7期1069-1074,共6页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目(51076082)

摘　　要：对湍流旋流燃烧进行数值模拟和预报的关键之一在于合理地描述湍流与化学反应之间的相互作用。该文应用描述湍流-化学反应相互作用的代数二阶矩-概率密度函数(PDF)模型,对旋流燃烧室内的湍流燃烧进行了数值模拟,给出了燃烧室内湍流平均反应率、温度脉动均方根值、燃料-氧气浓度脉动二阶矩、燃料浓度脉动二阶矩和氧气浓度脉动二阶矩的分布。结果表明:各浓度脉动二阶矩和温度脉动均方根值分布与湍流平均反应率分布之间有着较好的关联性。One of the keys to performing predictions of swirling turbulent combustion flows lies in the proper description of the turbulence-reaction interactions. The algebraic concentration moment-probability density function （PDF） model describing the turbulence-reaction interactions is used here in numerical simulations of turbulent combustion in a swirl combustor. The predictions provide the distributions of the time-averaged turbulent reaction rate, the root mean square of the fluctuating temperature, the second-order moment of the fluctuating fuel and oxygen concentrations, the second-order moment of the fluctuating fuel concentration, and the second-order moment of the fluctuating oxygen concentration in the combustor. The results indicate that the distributions of the second-order moments of the fluctuating concentrations and the root mean square of the fluctuating temperature are well correlated to the distribution of the time-averaged turbulent reaction rate.

关 键 词：湍流旋流燃烧 湍流-反应相互作用 代数二阶矩-概率密度函数模型 旋流燃烧室 数值模拟 

分 类 号：TK16[动力工程及工程热物理—热能工程]