Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 03, 2023 - September 06, 2023
The vortex bursting is a high-speed flame propagation phenomenon along a vortex. The vortex driving mechanism of the vortex bursting is explained by using a helical vortex line. Therefore, in this study, we investigated numerically which shape was more valid: the soliton-shape helical vortex line proposed by our research group or the non-soliton-shape helical vortex line proposed by Umemura’s research group. As a result, both of soliton-shape and non-soliton-shape were observed and both shapes were valid. Also, it was found that the location near the vortex core radius was the boundary between the soliton-shape and non-soliton-shape helical vortex lines. Furthermore, when the magnitude of the velocity induced near the flame top was estimated, the contribution of the soliton-shape helical vortex line was the most. Thus, from a viewpoint of the vortex driving mechanism, it was concluded that the soliton-shape helical vortex line inside the vortex core radius play a more important role than the non-soliton-shape helical vortex line outside the vortex core radius.
