Kazuki Sakaki
University of Tokyo
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Publication
Featured researches published by Kazuki Sakaki.
51st AIAA/SAE/ASEE Joint Propulsion Conference | 2015
Kazuki Sakaki; Hiromitsu Kakudo; Shinji Nakaya; Mitsuhiro Tsue; Hikaru Isochi; Kyohei Suzuki; Kazunori Makino; Tetsuo Hiraiwa
The pintle injector is a promising candidate of the propellant injection systems for a rocket engine with deep throttling capability which is essential for future space transportation missions. However, studies focusing on combustion phenomena in a rocket engine with a pintle injector is rather limited. In this study, optical measurements inside an ethanol/liquid oxygen rocket engine combustor with a planar pintle injector are conducted to clarify spray and flame structures in the pintle injector. Combustion tests where the chamber pressure is 0.36 to 0.40MPa and O/F is 1.15 to 1.40 are conducted. Effects of the injection configuration on spray structures are also evaluated. High speed imaging techniques are used to observe the flame and spray structures under hot fire conditions. Strong chemiluminescence of CH is observed in the vicinity of the impinging point of two propellants. Luminous flame is observed intermittently in the vicinity of the faceplate and the upper wall of the combustor with the direct observation of the flame. Characteristic exhaust velocity efficiency with oxidizercentered configuration is lower than fuel-centered configuration due to the large amount of propellant impinging on the upper wall of the combustor. Periodical phenomena with the frequency of approximately 300Hz which can be related to atomization processes are also observed.
Proceedings of the Combustion Institute | 2015
Shinji Nakaya; Yuta Hikichi; Yoshiki Nakazawa; Kazuki Sakaki; Minho Choi; Mitsuhiro Tsue; Michikata Kono; Sadatake Tomioka
Transactions of The Japan Society for Aeronautical and Space Sciences | 2015
Kazuki Sakaki; Minho Choi; Shinji Nakaya; Mitsuhiro Tsue; Tetsuo Hiraiwa
52nd AIAA/SAE/ASEE Joint Propulsion Conference | 2016
Kazuki Sakaki; Hiromitsu Kakudo; Shinji Nakaya; Mitsuhiro Tsue; Ryuichiro Kanai; Kyohei Suzuki; Takahiro Inagawa; Tetsuo Hiraiwa
Journal of Propulsion and Power | 2017
Kazuki Sakaki; Hiromitsu Kakudo; Shinji Nakaya; Mitsuhiro Tsue; Kyohei Suzuki; Ryuichiro Kanai; Takahiro Inagawa; Tetsuo Hiraiwa
Combustion and Flame | 2018
Kazuki Sakaki; Tomokazu Funahashi; Shinji Nakaya; Mitsuhiro Tsue; Ryuichiro Kanai; Kyohei Suzuki; Takahiro Inagawa; Tetsuo Hiraiwa
Journal of The Japan Society for Aeronautical and Space Sciences | 2017
Kazuki Sakaki; Tomokazu Funahashi; Shinji Nakaya; Mitsuhiro Tsue; Ryuichiro Kanai; Kyohei Suzuki; Takahiro Inagawa; Tetsuo Hiraiwa
Journal of The Japan Society for Aeronautical and Space Sciences | 2017
Hiromitsu Kakudo; Kazuki Sakaki; Shinji Nakaya; Mitsuhiro Tsue; Ryuichiro Kanai; Takahiro Inagawa; Tetsuo Hiraiwa
The Proceedings of the Thermal Engineering Conference | 2015
Osamu Imamura; Yuya Fukumi; Montoya Arina Dominik; Kazuhiro Akihama; Kazuki Sakaki; Shinji Nakaya; Mitsuhiro Tsue
Journal of The Japan Society for Aeronautical and Space Sciences | 2015
Shonosuke Kita; George Ianus; Kazuya Iwata; Kazuki Sakaki; Shunsuke Nishida; Hideyuki Taguchi; Mikiya Araki; Shuhei Takahashi; Osamu Imamura; Shinji Nakaya; Mitsuhiro Tsue