Photo Contest
2016 Photo Contest -Beautiful Flames- The HIGHEST AWARD
Blooming coal
Junpei Fukui1, Noriaki Nakatsuka1, Kazuki Tainaka1,2, Jun Hayashi1, Fumiteru Akamatsu1
1 Osaka University
2 CRIEPI
Explanation
This is a photograph of co-combustion field of ammonia and pulverized coal particles stabilized by a hydrogen/air counterflow diffusion flame. Counterflow flame is formed by air/ammonia premixed gas supplied from the top port and nitrogen/hydrogen premixed gas supplied from the bottom port. The ammonia premixed flame emits bright yellow luminescence. Pulverized coal particles, which are supplied from the top port, burn while spreading radially after passing the ammonia premixed flame front. The exposure time is set to 1/4 seconds to visualize trajectory of pulverized coal combustion like petals. Symmetric image processing emphasizes the beauty of the bloom.
Camera: Nikon D7100
Lens: AF-S NIKKOR 18-105 mm 3.5-5.6G DE
Exposure: 1/4 s, ISO speed: 100
2016 Photo Contest -Beautiful Flames- The MERIT AWARD
The Olympic Torch
Taejoon NOH1, Sunghwan YOON1, Yoichiro KOYAMA1, Nozomu HASHIMOTO1, Osamu FUJITA1
1 Yamagata University
Explanation
This flame was formed from interaction of upward propagating flame with acoustic in a combustion tube of 5 cm diameter and 70cm long. A desired curvature is initially given to the propagating flame by CO2 laser irradiation. The external laser irradiation preheats an unburned mixture locally in front of a reaction zone, and the flame propagation velocity increases locally. Here, the flame front acquires a strongly curved shape. The combustion tube is half-open at the bottom end, ignition side. C2H4/O2/CO2 mixture of Φ = 1.2 is used as the tested gas. When the strongly curved flame is exposed to the acoustic vibration field in the combustion tube, coherent corrugated structure is formed and then it turns to complicated turbulent motion. The picture is one moment of corrugated structure before transition to turbulent motion. This picture seems the Olympic torch. The topmost flame seems flame of torch ignited just now and the lower flames in the picture looks like a handle of the torch. Therefore, we name the flame as "The Olympic Torch". The Olympic torch for 2020 Tokyo Olympic is just ignited now.
Universe in flames
Tomomi Sasaki1, Kazunori Kuwana1
1 Hokkaido University
Explanation
This is a picture of a pair of counter-rotating fire whirls. The number of colors was first reduced to 256, and the edge of each color was then detected. There is a universe in each flame-and indeed, no flames are alike.