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研究了热量再循环和不同式Lewis数,对有机尘埃微粒燃烧的作用.在微型燃烧室中,由于热量再循环的影响更加显而易见,所以建立更好的模拟微型燃烧室性能的计算模型显得十分必要.为了模拟有机尘埃微粒的燃烧,假定尘埃微粒首先被气化,氧化成为一种化学结构已知的气相,接着假定该可燃气体的化学结构为甲烷.为了研究火焰的结构和求解控制方程,认为火焰结构由3个区域组成,即预热气化区、反应区和后火焰区.通过从后火焰区到预热区的排热来评价再循环现象.问题如下分步求解:首先对各区域的控制方程无量纲化;接着对各区域应用必要的边界条件和协调条件;然后按分析模型,对控制方程以及必要的边界条件和协调条件,同时进行求解.表明,再循环和不同式Lewis数,对有机尘埃微粒的燃烧特性有着显著的影响,得到不同微粒半径时的燃烧速度曲线和温度曲线等.结果与已发表的试验数据吻合.
The effects of heat recirculation and different Lewis numbers on the combustion of organic dust particles are studied, and it is quite necessary to establish a computational model to simulate the performance of the micro-combustion chamber in the micro-combustion chamber because of the influence of heat recirculation In order to simulate the combustion of organic dust particles, it is assumed that the dust particles are firstly gasified and oxidized into a gas phase with a known chemical structure, and then the chemical structure of the combustible gas is assumed to be methane.In order to study the structure of the flame and to solve the control equation, The flame structure is composed of three zones, preheating the gasification zone, the reaction zone and the post-flame zone, and the recycling phenomenon is evaluated by the heat rejection from the post-flame zone to the preheating zone.The problems are solved in steps as follows: First, Then the necessary boundary conditions and coordination conditions are applied to all regions; then the control equations and the necessary boundary conditions and coordination conditions are solved simultaneously according to the analytical model, which shows that the recirculation and the different Lewis numbers , Have a significant impact on the combustion characteristics of organic dust particles, get the combustion velocity curve and temperature curve of different particle radius. The results are consistent with published experimental data.