小尺度乙醇扩散火焰及管壁温度场的实验研究

Experimental esearch on small diffusion flame of ethanol and wall temperature

用不同的小尺度陶瓷圆管作为燃烧器,对液体乙醇在空气中的扩散火焰燃烧进行了实验研究。分析了火焰燃烧的三种不同的特性以及燃烧区域,考察了影响火焰高度与宽度的相关因素,并分析了燃烧时管壁的温度场。结果表明:稳定燃烧时火焰的高度与宽度均随流量的增大而线性增加,并随着内径的减小而减小。随着内径的减小,淬熄流量减小,振荡流量减小,稳定燃烧范围减小。同一流量下,管壁的温度以管口为基点呈指数规律递减。

Liquid ethanol diffusion flames in the air with different diameter of the small-scale ceramic tube were researched. Three different combustion characteristics and scopes were inspected, and the relevant factors which impact the height and width of the flame and the temperature field of the wall were analyzed. The results showed that the height and width of the stability flame was linear to the flow, and decreases with the decreasing of the diameter, simultaneity quenching flow decreased, Oscillation flow decreased, the scope of stability combustion reduced. The temperature of the wall decrease exponentially from the mouth of the tube.