提出将带滤波的叠栅偏折层析系统用于存在化学反应的多组分复杂气体流场的诊断。以丙烷的燃烧火焰为例, 实验提取出叠栅条纹的偏移量并转换为偏折角, 然后基于偏折层析的滤波反投影算法重建出场的折射率分布, 给出了两种不同情况下给定截面的三维温度和密度分布。对比发现, 对存在化学反应的多组分火焰流场不能基于假设研究对象是空气流场, 而必须对火焰流场本身发生的化学反应及生成物进行考虑, 混合流场的等效G-D常量和分子量必须根据不同场的具体组分情况进行修正。

The filtered moiré deflection tomography is proposed to diagnose multi-component complex flow fields which contain chemical reactions. As an example, the combustion of propane is chosen as the measured field. The offset of moiré fringe is refined and transformed to deflection angle. The refractive-index distribution of field is reconstructed by deflection filtered back projection (DFBP), and the three-dimensional temperature and density distributions of a certain cross section at two different situations are given. By contrast, multi-component complex flow fields should not regard air as the studied object, chemical reaction and resultant of flow field must be considered , and the equivalent G-D constant and molecular weight of mixed flow field must be amended, according to specific conditions of the measured objects.