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为了建立适用于超声速流动的湍流扩散燃烧模型,本文首先分析了火焰面模型应用于超声速流动的物理基础,然后数值模拟了轴对称超声速射流形成的氢气/空气扩散燃烧流场,利用实验数据校正了火焰面模型中重要物理量标量耗散率的模型系数.计算结果与实验数据的对比表明,本文修正后的火焰面模型对超声速湍流扩散燃烧流动的模拟能力是令人满意的.基于火焰面模型理论以及数值模拟结果,本文首次研究了湍流脉动对平均状态方程以及化学反应源项的影响机理,得到以下结论:组分浓度和温度脉动相关项对平均状态方程影响很小;温度脉动会降低水的生成速率,但其影响较小;组分浓度脉动在接近于氧化剂一侧区域增加水的生成速率,而在另外的大部分区域会降低水的生成速率;组分浓度与温度的脉动相关作用会很大程度上降低水的生成速率.
In order to establish a turbulent diffusion combustion model suitable for supersonic flow, this paper first analyzes the physical basis of flame surface model applied to supersonic flow and then numerically simulates the hydrogen / air diffusion combustion flow field formed by axisymmetric supersonic jet. The experimental data are used to correct The model coefficients of the scalar dissipation rate of the important physical quantities in the flame model are compared with those of the experimental data.The results show that the modified flame model is satisfactory for the simulation of supersonic turbulent diffusion combustion.Based on the flame model theory And the numerical simulation results, the mechanism of the turbulent pulsation on the average equation of state and the source of chemical reaction is studied for the first time. The following conclusions are obtained: the correlation between component concentration and temperature pulsation has little effect on the average equation of state; temperature pulsation will reduce the water But the effect is smaller. The component concentration pulsation increases the rate of water formation near the oxidant side, and reduces the rate of water formation in most of the other regions. The pulsatile correlation between temperature and component concentration To a large extent reduce the rate of water production.