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利用高光谱相机及紫外相机系统,获取CH4/O2同轴射流扩散火焰中CH*和OH*二维辐射发光信息,对火焰辐射特征进行了表征。研究表明:OH*与CH*可以准确地反映扩散火焰内外的结构;在层流状态不同当量比例下OH*分布变化明显,随着当量比例增大,OH*分布范围逐渐变大,逐渐向火焰下游扩展,而CH*主要存在于火焰锋面以内,不随当量比例变化;在湍流条件OH*与CH*分布差别不大,当量比例对其分布范围的影响也降低,随着当量比例的增加OH*与CH*峰值强度也发生变化。
The hyperspectral camera and the ultraviolet camera system were used to acquire the two-dimensional emission information of CH * and OH * in the CH4 / O2 coaxial jet diffusion flame. The flame radiation characteristics were characterized. The results show that OH * and CH * can accurately reflect the structure inside and outside the diffusion flame. The distribution of OH * changes obviously with different equivalence ratios of laminar flow state. As the equivalence ratio increases, the distribution range of OH * gradually increases, And CH * mainly exist within the flame front, and do not change with the equivalent ratio. The distribution of OH * and CH * is not significantly different under turbulent flow conditions, and the influence of equivalent ratio on the distribution range is also reduced. With the increase of equivalent ratio, OH * The peak intensity also changes with CH *.