Photo Contest
2015 Photo Contest -Beautiful Flames- The HIGHEST AWARD
Fire vortex like a rose on rotating paper
Koki Kobayashi
Graduate School of Systems Science and Technology, Akita Prefectural University
Explanation
In this picture, flames spread along the rotating paper. Vortices were generated by rotation. Fire whirls were seen at surroundings.
2015 Photo Contest -Beautiful Flames- The MERIT AWARD
Galaxy in Space Propulsion Engine
Hiroumi Tani1, Yu Daimon1, Masahiro Sasaki2, Yoshiki Matsuura2
1 Japan Aerospace Exploration Agency
2 IHI Aerospace
Explanation
Liquid propellants for space propulsion engines have hypergolic characteristics which mean fuel and oxidizer spontaneously auto-ignite without ignition devices when they come into contact with each other. The photographs show the thin flames which appeared in the narrow gap between liquid fuel and oxidizer jets. When the injection velocities increased, liquid fuel and oxidizer strongly impinged each other and the flames immediately developed. The developing flames surrounded by ligaments of liquid fuel and oxidizer look like a beautiful galaxy.