基于二维激光诱导炽光法的棉籽油扩散火焰碳烟生成特性
Investigation on the Soot Formation of Cottonseed Oil Diffusion Flame by Two-Dimensional Laser Induced Incandescence

搭建了一套二维激光诱导炽光测试系统，获得乙烯扩散火焰的碳烟体积分数，并将其与单点标定激光诱导炽光法和消光法得到的测试结果比对，验证了该测试系统的有效性.在一台液体燃烧器上，应用二维激光诱导炽光法研究棉籽油掺混比对柴油层流扩散火焰碳烟生成的影响.结果表明：随掺混比的增加，最大碳烟体积分数以及碳烟总量呈现降低趋势.在轴心方向上随火焰高度的增加，碳烟体积分数逐渐增加，在中部达到最大值，随火焰高度的进一步增加，碳烟体积分数开始降低.径向上的碳烟浓度峰值随火焰高度的上升由火焰外侧向火焰中心移动，且峰值先增加后降低.
A two-dimensional LⅡ (2D-LⅡ) experiment system was established to first measure the soot volume fraction distribution in the Gülder ethylene diffusion flame.Compared with the extinction method and the single-point LⅡ calibration method,the experiment results show its validity.The 2D-LⅡ setup was then used to investigate the effects of cottonseed oil on soot formation of vaporized diesel laminar diffusion flame produced on a liquid burner.The results show that with increasing the blending ratio both the maximum volume fraction and the total amount of soot decrease.In the flame centerline region,the soot volume fraction first increases with increasing the flame height to reach a peak and then decreases towards the flame tip.The peak value of the soot concentration appears in the flame-wing in the lower part of the flame and moves towards the flame centerline with increasing the flame height