发射CT法同时测量含烟黑火焰的温度与烟黑浓度分布的实验研究

Simultaneous Measurement of Non-Uniform Temperature and Soot Volume Fraction in Sooting Flames by Emission CT Method

基于烟黑辐射特性,利用烟黑单色辐射强度图像信息,采用CT算法同时重建含烟黑火焰温度与烟黑浓度分布,对蜡烛火焰与煤油火焰的温度与烟黑体积分数进行了测量.测量结果表明在两种火焰中,较大烟黑浓度都位于较高火焰温度之内,即在火焰外环的反应区内.另外,由于煤油火焰的燃料量大,因而会增大火焰中的烟黑浓度,辐射损失增大,降低火焰温度.这与有关实验结论是一致的.

For visualizing non-uniform absorbing, emitting, non-scattering, axisymmetric sooting flames, a new emission CT method is used to estimate temperatures and soot volume fractions simultaneously in a candle flame and a kerosene flame from the monochromatic radiation intensity images captured by a flame image detector. The results indicate that the greater soot concentration lies inside the higher flame temperature zones in the two flames, both inside the flame front and outside the flame axis. In addition, the fuel flow rate of the kerosene flame is greater than that of the candle flame, which increases the amount of soot in the flame, thus increasing radiation losses. This, in turn, causes a lower flame temperature. It agrees with relevant experimental data in literature.