Mechanism of High-Speed Flame Propagation along a Vortex Ring

Abstract

The purpose of this study is to clarify the mechanism of high-speed flame propagation along a vortex ring (the vortex bursting) by 3-D numerical simulation. In the 3-D visualization of vortex line and temperature distributions in the calculation domain, the helical vortex line was seen near the flame top. Furthermore, in the 1-D geometrical analysis along the vortex line, the peaks of curvature and torsion (the solitary waves like the vortex filament solitons) were observed at the locations of large temperature gradient (the flame zones), and these solitary waves and flame zones propagated together along the vortex line. Thus, it was found that the vortex filament solitons might play an important role in the mechanism of high-speed flame propagation along a vortex, and the results of this study proved the validity of the original idea of vortex driving mechanism proposed by Shinoda et al. (1993).