直线运动下移动火源燃烧实验和数值模拟

Mobile fire combustion experiment and numerical simulation during linear motion

为了研究直线运动下移动火源的燃烧特性,对风洞中做直线运动的蜡烛火焰在不同工况下的燃烧进行了实验,并运用Fluent软件进行数值模拟对比分析。研究结果表明:当移动火源与空气的相对速度为0.44m/s时,风作用和车作用2种不同情况下火焰都向同一个方向偏转,但火焰形态差异较大,前者火焰短而宽,后者火焰细而长,且后者燃烧温度更高。绝对静止燃烧和相对静止燃烧时,前者火焰呈左右对称图形,后者火焰向火源运动的反方向偏转,后者燃烧温度更高。因此,移动火源与静止火源燃烧有区别,不能利用相对运动的概念来分析移动火源燃烧。

In order to study combustion characteristics of mobile fire during linear motion,candle flame during linear motion experiment in a wind tunnel was made to research the combustion mechanism and the Fluent software was also used as a numerical simulation contrast.The results show that flame will deflect to the same direction in the two different conditions of wind movement and car movement when mobile fire and air relative speed is 0.44 m/s,but their flame shapes are different,the former flame is short and wide,while the latter flame is thin and long,and the latter combustion temperature is higher.Compared with the relative rest combustion,absolute rest combustion flame is symmetrical graph, the latter flame form moves to the contrary direction of the movement of fire,and the latter flame combustion temperature is higher.So mobile and static fires are different,and relative motion concept can not be used to research the mobile fire combustion.