Experimental study of particle flow field and gas flow field in the flame of pyrotechnic combustion

The particle image velocimetry (PIV) and high-speed photographic camera (HSC) photography were employed to study two-phase flow properties of gas flow field and burning particle flow field in the flame of the pyrotechnics. Particle image velocimetry tested the gas flow field of burning flame of pyrotechnic powder, while the high-speed photographic apparatus captured the pyrotechnic flame of burning particles through full-course after filtering out the impact of gas flame radiation and soot by setting the exposure time. The coordinate of each burning particle in the image was determined by the image processing method. Moving trajectory for each burning particle was calculated according to continuous images, and then got the velocity vector diagram of burning particles. Furthermore, particle and gas flow fields of burning particles were comparatively analyzed. This study provided a simple method of analyzing the flame structure of burning particles for the combustion mechanism of pyrotechnics.