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Publication
Featured researches published by Noriaki Nakamura.
ASME 2005 Fluids Engineering Division Summer Meeting | 2005
Yoshiki Yoshida; Kengo Kikuta; Satoshi Hasegawa; Mitsuru Shimagaki; Noriaki Nakamura; Takashi Tokumasu
For experimental investigations of the thermodynamic effect on a cavitating inducer, it is nesessary to observe the cavitation. However, visualizations of the cavitation are not so easy in cryogenic flow. For this reason, we estimated the cavity region in liquid nitrogen based on measurements of the pressure fluctuation near the blade tip. In the present study, we focused on the length of the tip cavitation as a cavitation parameter. Comparison of the tip cavity length in liquid nitrogen (80 K) with that in cold water (296 K) allowed us to estimate the strength of the thermodynamic effect. The degree of thermodynamic effect was found to increase with an increase of the cavity length. The estimated temperature depression caused by vaporization increased rapidly when the cavity length extended over the throat. In addition, the estimated temperature inside the bubble nearly reached the temperature of the triple point when the pump performance deteriorated.Copyright
Transactions of the Japan Society of Mechanical Engineers. B | 2006
Yoshiki Yoshida; Kengo Kikuta; Satoshi Hasegawa; Mitsuru Shimagaki; Noriaki Nakamura; Takashi Tokumasu
For experimental investigations of the thermodynamic effect on a cavitating inducer, it is neccesary to observe the cavitation. However, visualizations of the cavitation are not so easy in cryogenic flow. For this reason, we estimated the cavity region in liquid nitrogen based on measurements of the pressure fluctuation near the blade tip. The degree of the thermodynamic effect was found to increase with the increase of the cavity length of the tip cavitation. The estimated temperature depression caused by vaporization increased rapidly when the cavity length extended over the throat. In addition, the estimated temperature inside the bubble nearly reached the temperature of the triple point when the pump performance deteriorated.
JOURNAL OF THE FLOW VISUALIZATION SOCIETY OF JAPAN | 2004
Mitsuo Watanabe; Satoshi Hasegawa; Mitsuru Shimagaki; Tomoyuki Hashimoto; Yoshiki Yoshida; Takashi Shimura; Noriaki Nakamura
The effects of the inlet casing configurations on unsteady cavitation were examined with a 3-bladed inducer. The inlet flow and cavitation pattern with two casings were visualized using by PIV and high-speed video. It was found that the rotating cavitation would be suppressed when the tip clearance at the inducer inlet was increased. The vortex cavitation in tip leakage flow and cavitation in back flow effected the suppression of the rotating cavitation through the inlet casing configuration.
42nd AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit | 2006
Mitsuru Shimagaki; Mitsuo Watanabe; Tomoyuki Hashimoto; Satoshi Hasegawa; Yoshiki Yoshida; Noriaki Nakamura
The Proceedings of Conference of Tohoku Branch | 2007
Satoshi Hasegawa; Noriaki Nakamura; Tomoyuki Hashimoto; Mitsuo Watanabe; Mitsuru Shimagaki
JAXA research and development report | 2007
Mitsuo Watanabe; Satoshi Hasegawa; Mitsuru Shimagaki; Tomoyuki Hashimoto; Noriaki Nakamura; Katsuji Nagaura; Yoshiki Yoshida
The proceedings of the JSME annual meeting | 2006
Mitsuru Shimagaki; Tomoyuki Hashimoto; Satoshi Hasegawa; Noriaki Nakamura; Katsuji Nagaura
The proceedings of the JSME annual meeting | 2006
Tomoyuki Hashimoto; Noriaki Nakamura; Mitsuru Shimagaki; Satoshi Hasegawa; Katsuji Nagaura; Satoshi Kawasaki; Yoshiki Yoshida
The proceedings of the JSME annual meeting | 2006
Yoshiki Yoshida; Koichi Okita; Yoshifumi Sasao; Satoshi Hasegawa; Mitsuru Shimagaki; Noriaki Nakamura; Yuka Iga
The proceedings of the JSME annual meeting | 2006
Mitsuo Watanabe; Satoshi Hasegawa; Mitsuru Shimagaki; Katsuji Nagaura; Noriaki Nakamura; Tomoyuki Hashimoto; Yoshiki Yoshida
