TY - GEN
T1 - Aerodynamic performances and flow fields of pareto optimal solutions in an aerodynamic design of a wind-lens turbine
AU - Oka, Nobuhito
AU - Furukawa, Masato
AU - Yamada, Kazutoyo
AU - Oka, Akihiro
AU - Kurokawa, Yasushi
N1 - Funding Information:
The present research was partially supported by the Japan Society for the Promotion of Science (JSPS), Grant-in-Aid for Scientific Research (B), KAKENHI 24360072, 2012.
Publisher Copyright:
Copyright © 2015 by ASME.
PY - 2015
Y1 - 2015
N2 - The new type of shrouded wind turbine called "wind-lens turbine" has been developed. The wind-lens turbine has a brimmed diffuser called "wind-lens", by which the wind concentration on the turbine blade and the significant enhancement of the turbine output can be achieved. A simultaneous optimization method for the aerodynamic design of rotor blade and wind-lens has been developed. The present optimal design method is based on a genetic algorithm (GA) which enables multi objective aerodynamic optimization. In the present study, aerodynamic performances and flow fields of the Pareto optimal solutions of wind-lens turbines designed by the present optimal design method have been investigated by windtunnel tests and three-dimensional Reynolds averaged Navier-Stokes (RANS) analyses. Output power coefficients obtained from the wind-tunnel tests in the optimal wind-lens turbine exceeded the Betz limit, which is the performance limitation for bare wind turbines. The numerical results and the experimental results show that the suppression of flow separations in the diffuser is important to achieve significant improvement in aerodynamic performances. As a result, it is found that the aerodynamic performance of wind-lens turbine is significantly affected by the interrelationship between the internal and external flow fields around the wind-lens.
AB - The new type of shrouded wind turbine called "wind-lens turbine" has been developed. The wind-lens turbine has a brimmed diffuser called "wind-lens", by which the wind concentration on the turbine blade and the significant enhancement of the turbine output can be achieved. A simultaneous optimization method for the aerodynamic design of rotor blade and wind-lens has been developed. The present optimal design method is based on a genetic algorithm (GA) which enables multi objective aerodynamic optimization. In the present study, aerodynamic performances and flow fields of the Pareto optimal solutions of wind-lens turbines designed by the present optimal design method have been investigated by windtunnel tests and three-dimensional Reynolds averaged Navier-Stokes (RANS) analyses. Output power coefficients obtained from the wind-tunnel tests in the optimal wind-lens turbine exceeded the Betz limit, which is the performance limitation for bare wind turbines. The numerical results and the experimental results show that the suppression of flow separations in the diffuser is important to achieve significant improvement in aerodynamic performances. As a result, it is found that the aerodynamic performance of wind-lens turbine is significantly affected by the interrelationship between the internal and external flow fields around the wind-lens.
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U2 - 10.1115/GT2015-43619
DO - 10.1115/GT2015-43619
M3 - Conference contribution
AN - SCOPUS:84954289839
T3 - Proceedings of the ASME Turbo Expo
BT - Oil and Gas Applications; Supercritical CO2 Power Cycles; Wind Energy
PB - American Society of Mechanical Engineers (ASME)
T2 - ASME Turbo Expo 2015: Turbine Technical Conference and Exposition, GT 2015
Y2 - 15 June 2015 through 19 June 2015
ER -