naa a22 4500 51076567X CHVBK 20180411083155.0 cr unu---uuuuu 180411e20130201xx s 000 0 eng 10.1007/s11630-013-0585-2 doi (NATIONALLICENCE)springer-10.1007/s11630-013-0585-2 Counter-rotating type pump-turbine unit cooperating with wind power unit [Elektronische Daten] [Tengen Murakami, Toshiaki Kanemoto] This serial research proposes the hybrid power system combined the wind power unit with the counter-rotating type pump-turbine unit, to provide the constant output for the grid system, even at the suddenly fluctuating/turbulent wind. In this paper, the tandem impellers of the counter-rotating type pumping unit was operated at the turbine mode, and the performances and the flow conditions were investigated numerically and experimentally. The 3-D turbulent flows in the runners were simulated at the steady state condition by using the commercial CFD code of ANSYS-CFX ver.12 with the SST turbulence model. While providing the pump unit for the turbine mode, the maximum hydraulic efficiency is close to one of the counter-rotating type hydroelectric unit designed exclusively for the turbine mode. Besides, the runner/impeller of the unit works evidently so as to coincide the angular momentum change through the front runners/impellers with that through the rear runners/impellers, namely to take the axial flow at not only the inlet but also the outlet without the guide vanes. These results show that this type of unit is effective to work at not only the pumping but also the turbine modes. Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag Berlin Heidelberg, 2013 pump-turbine nationallicence pumping mode nationallicence turbine mode nationallicence power supply nationallicence counter-rotation nationallicence Murakami Tengen Faculty of Engineering, Kyushu Institute of Technology, Fukuoka, Japan aut Kanemoto Toshiaki Faculty of Engineering, Kyushu Institute of Technology, Fukuoka, Japan aut Journal of Thermal Science SP Science Press 22/1(2013-02-01), 7-12 1003-2169 22:1<7 2013 22 11630 https://doi.org/10.1007/s11630-013-0585-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11630-013-0585-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Murakami Tengen Faculty of Engineering, Kyushu Institute of Technology, Fukuoka, Japan aut NATIONALLICENCE 700 1- Kanemoto Toshiaki Faculty of Engineering, Kyushu Institute of Technology, Fukuoka, Japan aut NATIONALLICENCE 773 0- Journal of Thermal Science SP Science Press 22/1(2013-02-01), 7-12 1003-2169 22:1<7 2013 22 11630 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer