Photo Contest
2020 Photo Contest -Beautiful Flames- The HIGHEST AWARD
Detonation Engine to Space
Jiro KASAHARA1, Koichi MATSUYAMA1, Ken MATSUOKA1, Akira KAWASAKI1, Hiroaki WATANABE1, Noboru ITOUYAMA1, Keisuke GOTO1, Kazuki ISHIHARA1, Valentin BUYAKOFU1, Tomoyuki NODA1, Akiko MATSUO2, Ikkoh FUNAKI3, Hiroto HABU3, Shinsuke TAKEUCHI3, Satoshi ARAKAWA3, Junichi MASUDA3, Kenzi MAEHARA3, Asato WADA3, Akihiro IWASAKI3, Shuichi NAKAMURA4, Shinji TOYONAGA4, Osamu HARADA4, Hidefumi KAWANO4, Fumitaka YAMAMOTO4, Syouji KAWAMOTO4, Kazuyuki HIGASHINO4, Daisuke NAKATA5, Masaharu UCHIUMI5, Naoya MITA6, Hiromi JINDO6, Ichiro DOYAMA6, Tatsuya KATO6
1 Nagoya University
2 Keio University
3 JAXA/ISAS
4 NETS Corporation
5 Muroran Institute of Technology
6 MEIJI ELECTRIC INDUSTRIES
Explanation
A program is underway to use a sounding rocket to demonstrate the performance of the detonation engine as a propulsion vehicle for the first time in space flight. The chemiluminescence extending to the lower left is a jet of high-pressure gas burned by the methane-oxygen detonation. The jet of high-pressure gas is produced by the detonation propagating through the small gap at the bottom of the annular cylinder type detonation engine.
2020 Photo Contest -Beautiful Flames- The MERIT AWARD
Catch me if you can
Hiroyuki Tanaka1, Hiroyuki Torikai1
1 Hirosaki University
Explanation
Please move the position where you are looking, from upper side to lower side in the picture. You can find two flamelets are chasing each other. It is like playing tag. Chasing of the flamelets, that is, propagation of edge flames, are observed in a blowoff process of a ring-shaped diffusion flame formed with an axisymmetric wall jet burner. The two flamelets never be able to catch up with each other because these are in symmetric positions on the ring-shaped porous plate, which issues a gaseous fuel flow.
The axisymmetric wall jet burner developed by the authors, consists of a round nozzle and a ring-shaped porous plate which is embedded in a flat impinging plate. Using the burner, we can examine fundamental characteristics of edge flames without end effect two-dimensional diffusion flames always have. Airflow issues from the nozzle with 40 mm diameter and is impinged onto the flat plate which is placed 10 mm away from the nozzle. Methane gas flow is ejected from the porous plate whose inner and outer diameters are 50 mm and 78 mm.
2020 Photo Contest -Beautiful Flames- The MERIT AWARD
A Blue Four-Leaf Clover JET that Brings Happiness
Ryosuke Hara1, Takeaki Kudo1, Tatsuya Fujikawa1, Masahisa Yamakawa1
1 Mazda Motor Corporation
Explanation
A combustion image of a four-hole pre-chamber plug recorded in an optical gasoline engine (bottom-view). Four jets from the holes volumetric ignites the pre-mixture and achieves a rapid combustion by a blue flame similar to a four-leaf clover. We hope that this combustion will contribute to the reduction of CO2 emissions from internal combustion engines and bring happiness to all people.