Simultaneous optimization of rotor blade and wind-lens for aerodynamic design of wind-lens turbine

Nobuhito Oka, Masato Furukawa, Kazutoyo Yamada, Kenta Kawamitsu, Kota Kido, Akihiro Oka

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

An optimum aerodynamic design method for the new type of wind turbine called "wind-lens turbine" has been developed. The wind-lens turbine has a diffuser with brim called "wind-lens", by which the wind concentration on the turbine rotor and the significant enhancement of the turbine output can be achieved. In order to design efficient wind-lens turbines, an aerodynamic design method for the simultaneous optimization of rotor blade and wind-lens has been developed. The present optimum design method is based on a genetic algorithm (GA) and a quasi-three-dimensional design of turbine rotor. In the GA procedure, the Non-dominated Sorting Genetic Algorithm II (NSGA-II) is used as evaluation and selection model. The Real-coded Ensemble Crossover (REX) is used as crossover model. The quasi-three-dimensional design consists of two parts: meridional viscous flow calculation and two-dimensional blade element design. In the meridional viscous flow calculation, an axisymmetric viscous flow is numerically analyzed on a meridional plane to determine the wind flow rate through the wind-lens and the spanwise distribution of the rotor inlet flow. In the two-dimensional rotor blade element design, the turbine rotor blade profile is determined by a one-dimensional through flow modeling for the wind-lens turbine and a two-dimensional blade element theory based on the momentum theorem of the ducted turbine. Total performances and three-dimensional flow fields of the optimized wind-lens turbines have been investigated by Reynolds averaged Navier-Stokes (RANS) simulations, in order to verify the present design method. The RANS simulations and the flow visualization have been applied to conventional and optimum design cases of the wind-lens turbine, in order to elucidate the relation between their aerodynamic performances and the flow fields around them. The numerical results show that separation vortices behind the wind-lens brim play a major role in the wind concentration and the diffuser performance of the wind-lens. 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.

Original languageEnglish
Title of host publicationASME Turbo Expo 2014
Subtitle of host publicationTurbine Technical Conference and Exposition, GT 2014
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Electronic)9780791845660
DOIs
Publication statusPublished - Jan 1 2014
EventASME Turbo Expo 2014: Turbine Technical Conference and Exposition, GT 2014 - Dusseldorf, Germany
Duration: Jun 16 2014Jun 20 2014

Publication series

NameProceedings of the ASME Turbo Expo
Volume3B

Other

OtherASME Turbo Expo 2014: Turbine Technical Conference and Exposition, GT 2014
CountryGermany
CityDusseldorf
Period6/16/146/20/14

Fingerprint

Turbomachine blades
Lenses
Aerodynamics
Turbines
Rotors
Viscous flow
Flow fields
Genetic algorithms
Inlet flow
Flow visualization
Sorting
Wind turbines
Momentum
Vortex flow
Flow rate

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Oka, N., Furukawa, M., Yamada, K., Kawamitsu, K., Kido, K., & Oka, A. (2014). Simultaneous optimization of rotor blade and wind-lens for aerodynamic design of wind-lens turbine. In ASME Turbo Expo 2014: Turbine Technical Conference and Exposition, GT 2014 (Proceedings of the ASME Turbo Expo; Vol. 3B). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/GT2014-25770

Simultaneous optimization of rotor blade and wind-lens for aerodynamic design of wind-lens turbine. / Oka, Nobuhito; Furukawa, Masato; Yamada, Kazutoyo; Kawamitsu, Kenta; Kido, Kota; Oka, Akihiro.

ASME Turbo Expo 2014: Turbine Technical Conference and Exposition, GT 2014. American Society of Mechanical Engineers (ASME), 2014. (Proceedings of the ASME Turbo Expo; Vol. 3B).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Oka, N, Furukawa, M, Yamada, K, Kawamitsu, K, Kido, K & Oka, A 2014, Simultaneous optimization of rotor blade and wind-lens for aerodynamic design of wind-lens turbine. in ASME Turbo Expo 2014: Turbine Technical Conference and Exposition, GT 2014. Proceedings of the ASME Turbo Expo, vol. 3B, American Society of Mechanical Engineers (ASME), ASME Turbo Expo 2014: Turbine Technical Conference and Exposition, GT 2014, Dusseldorf, Germany, 6/16/14. https://doi.org/10.1115/GT2014-25770
Oka N, Furukawa M, Yamada K, Kawamitsu K, Kido K, Oka A. Simultaneous optimization of rotor blade and wind-lens for aerodynamic design of wind-lens turbine. In ASME Turbo Expo 2014: Turbine Technical Conference and Exposition, GT 2014. American Society of Mechanical Engineers (ASME). 2014. (Proceedings of the ASME Turbo Expo). https://doi.org/10.1115/GT2014-25770
Oka, Nobuhito ; Furukawa, Masato ; Yamada, Kazutoyo ; Kawamitsu, Kenta ; Kido, Kota ; Oka, Akihiro. / Simultaneous optimization of rotor blade and wind-lens for aerodynamic design of wind-lens turbine. ASME Turbo Expo 2014: Turbine Technical Conference and Exposition, GT 2014. American Society of Mechanical Engineers (ASME), 2014. (Proceedings of the ASME Turbo Expo).
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