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Development of plug and socket-outlet for 400 volts direct current distribution system
Seungseok BAEK,Takashi yuba,Koichi KIRYU,Akio NAKAMURA,Hideo MIYAZAWA,Masatoshi NORITAKE,Keiichi HIROSE 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
This paper reports test results and reviews of the developed DC plug and socket-outlet. The developed item can be applied to the 400 Vdc power to improve energy efficiency in telecommunication sites, data centers, commercial buildings, and smart energy. There are some safety issues to use the 400 Vdc power. The set of plug and socket-outlet has a unique mechanism which based on combination of a permanent magnet and mechanical contact in the limited small space. That should solve the problems such as both arc extinction and protection against electric shock known as critical DC power issue for a long time.
Experimental Study and Numerical Simulation of Cavity Oscillation in a Diffuser with Swirling Flow
Chen, Chang-Kun,Nicolet, Christophe,Yonezawa, Koichi,Farhat, Mohamed,Avellan, Francois,Miyazawa, Kazuyoshi,Tsujimoto, Yoshinobu Korean Society for Fluid machinery 2010 International journal of fluid machinery and syste Vol.3 No.1
The cavity oscillation with swirling flow in hydraulic power generating systems was studied by a simple experiment and numerical simulation. Several types of fluctuation were observed in the experiment, including the cavitation surge caused by the diffuser effect and the vortex precession by the swirling flow. Both cavitation surge and vortex precession were simulated by CFD. Detailed flow structure was examined through flow visualization and CFD.
Experimental Study and Numerical Simulation of Cavity Oscillation in a Conical Diffuser
Chen, Chang-Kun,Nicolet, Christophe,Yonezawa, Koichi,Farhat, Mohamed,Avellan, Francois,Miyazawa, Kazuyoshi,Tsujimoto, Yoshinobu Korean Society for Fluid machinery 2010 International journal of fluid machinery and syste Vol.3 No.1
Based on the one-dimensional stability analysis, the self-excited oscillation in hydraulic power generating systems was studied by a simple experiment and numerical simulation. It was shown that a cavity in a conical diffuser can cause surge. With the diffuser, a high amplitude and low frequency oscillation occurs at low cavitation number. This oscillation was not observed with the straight pipe. It was confirmed that the diffuser effect of the draft tube can be the cause of the full load surge in hydraulic power system. Numerical results were also analyzed to check the validity of the one-dimensional stability analysis.