Ar稀释C2H2+2.5O2预混气高频爆轰的端面结构

为了研究预混气爆轰的内部结构，对不同浓度的Ar稀释的C₂H₂+2.5O₂预混气进行爆轰实验和数值计算。首先，在内径63.5 mm的管道内进行爆轰实验，使用烟熏玻璃记录了不同初始压力下C₂H₂+2.5O₂预混气的爆轰端面结构。使用数字化图像处理技术来分析烟熏玻璃记录的三波点轨迹，以减少人为误差。然后，观察实验结果并描绘规则图形，图像识别程序经过验证后，用于分析实验结果。从端面结构中对封闭图形进行圆的拟合，用胞格半径方差来表示胞格大小的均匀程度；用相邻胞格圆心距的方差来表示胞格分布的规则程度。通过对比不同Ar稀释下半径方差和圆心距方差随胞格数量的变化，给出不同浓度Ar稀释下C₂H₂+2.5O₂预混气的端面胞格尺寸及分布规律，随着Ar浓度的升高，预混气端面胞格分布更加规律。

High-frequency spiral detonation end-on records of premixed C2H2+2.5O2 with different argon dilution

In order to study the internal structure of premixed gas detonation, detonation experiments and calculation analysis of C₂H₂+2.5O₂ premixed gas diluted with different concentrations of argon were performed. Firstly, the detonation experiment was carried out in a pipe with an internal diameter of 63.5 mm. The detonation end-on structures of C₂H₂+2.5O₂ premixed gas under different initial pressures were recorded by using smoke glass. Digital image processing was used to analyze the three-point of smoked glass records to reduce human errors. Then, the regular graphics were obtained after the examination of experimental results, the calculations of experimental results were performed using a verified program. From the end-on structure, the closed graph is fitted with circle. The uniformity of cell size was expressed by the variance of cell radius. The regularity of the distribution of cell lattices was expressed by the variance of the distance between the centers of adjacent cells. By comparing the variance of the radius and the variance of the center distance with the change of cell number in different argon dilution, the size and distribution regulation of C₂H₂+2.5O₂ premixed gas under different argon dilution were given. With the increase of argon concentration, the size and distribution of the cell is more regular.