TY - JOUR
T1 - Counter-rotating type tidal stream power unit
T2 - 29th IAHR Symposium on Hydraulic Machinery and Systems, IAHR 2018
AU - Samura, Isao
AU - Kuwano, Kazuo
AU - Kawashima, Ryunosuke
AU - Oda, Taizo
AU - Imakyurei, Takumi
AU - Inoue, Hideyuki
AU - Tokunaga, Yuuichiro
AU - Kanemoto, Toshiaki
AU - Miyagawa, Kazuyoshi
AU - Miwa, Toshihiko
AU - Yamanokuchi, Hiroshi
N1 - Funding Information:
This verification tests for power generation and safety operation, were performed as "Development Project of Counter-Rotating Type Tidal Stream Power Unit" supported by the New Energy and Industrial Technology Development Organization (NEDO) in Japan. The authors wish to gratefully thank concerned parties in NEDO and Kowa Kogyo Co., Ltd which supports the tests.
Funding Information:
This verification tests for power generation and safety operation, were performed as “Development Project of Counter-Rotating Type Tidal Stream Power Unit” supported by the New Energy and Industrial Technology Development Organization (NEDO) in Japan. The authors wish to gratefully thank concerned parties in NEDO and Kowa Kogyo Co., Ltd which supports the tests.
Publisher Copyright:
© Published under licence by IOP Publishing Ltd.
PY - 2019/3/28
Y1 - 2019/3/28
N2 - A counter-rotating type tidal stream power unit, composed of tandem propellers and a peculiar generator with double rotatable armatures, was provided for verification tests at offshore. The front propeller with diameter of 1 m has three blades, and the rear propeller with diameter of 0.95 m has five blades. The blade profiles were optimized with the blade element-momentum theory and CFD, and then covered with CFRP. The front and the rear propellers connect to inner and outer armatures in a synchronous type generator with net output 1.5 kW, whose efficiency was improved by heat pipes and the modification of the armature profiles. The shafts are equipped with mechanical seals to protect electric circuits from seawater. A rotational speed control system was also prepared not only to adjust the output but also to overcome the static friction torque due to bearings, slip rings and mechanical seals while starting-up. The power unit takes the maximum output with excellent efficiency at the relative tip speed ratio specified in the unit design. The unit can start-up after maintenance works and the output can be adjusted smoothly in the stream.
AB - A counter-rotating type tidal stream power unit, composed of tandem propellers and a peculiar generator with double rotatable armatures, was provided for verification tests at offshore. The front propeller with diameter of 1 m has three blades, and the rear propeller with diameter of 0.95 m has five blades. The blade profiles were optimized with the blade element-momentum theory and CFD, and then covered with CFRP. The front and the rear propellers connect to inner and outer armatures in a synchronous type generator with net output 1.5 kW, whose efficiency was improved by heat pipes and the modification of the armature profiles. The shafts are equipped with mechanical seals to protect electric circuits from seawater. A rotational speed control system was also prepared not only to adjust the output but also to overcome the static friction torque due to bearings, slip rings and mechanical seals while starting-up. The power unit takes the maximum output with excellent efficiency at the relative tip speed ratio specified in the unit design. The unit can start-up after maintenance works and the output can be adjusted smoothly in the stream.
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U2 - 10.1088/1755-1315/240/5/052003
DO - 10.1088/1755-1315/240/5/052003
M3 - Conference article
AN - SCOPUS:85063865607
SN - 1755-1307
VL - 240
JO - IOP Conference Series: Earth and Environmental Science
JF - IOP Conference Series: Earth and Environmental Science
IS - 5
M1 - 052003
Y2 - 16 September 2018 through 21 September 2018
ER -