Wind Energy
Online ISSN : 1884-457X
Print ISSN : 0387-6217
ISSN-L : 0387-6217
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Volume 38, Issue 2
Displaying 1-45 of 45 articles from this issue
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  • Blade shape effects on power characteristics of ribbon type wind turbines
    Hajime MOTOHASHI, Shoichi TAN
    2014 Volume 38 Issue 2 Pages A_23-A_28
    Published: 2014
    Released on J-STAGE: September 30, 2016
    DOIhttps://doi.org/10.11333/jwea.38.2_A_23
    JOURNAL FREE ACCESS
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    Power characteristics of horizontal axis wind turbines with loop-formed plastic ribbons as blades were investigated by wind tunnel tests. When blade mounting positions to the hub of ribbon both ends were twisted 10 degrees, turbine showed peak power. The power of a wind turbine with two blades was inferior to that of turbines with three and four blades. Solidity giving maximum power was found to be 0.5～0.6 by changing blade width and number of blades. Influence of installation location of blades in their width direction to hub was examined. Optimum blade setting angles were found to be 40° at windward and 30° at leeward. Deformation of blades in rotating turbine was observed and seemed to suppress overspeed.
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  • Coastal wind profile observations using a Doppler Light Detection and Ranging system at the Hazaki Oceanographical Research Station
    Susumu SHIMADA, Teruo OHSAWA, Tatsuya OHGISHI, Yoshihiro KIKUSHIMA, Te ...
    2014 Volume 38 Issue 2 Pages A_29-A_35
    Published: 2014
    Released on J-STAGE: September 30, 2016
    DOIhttps://doi.org/10.11333/jwea.38.2_A_29
    JOURNAL FREE ACCESS
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    Vertical wind speed profiles near the coast were observed using a Doppler Light Detection and Ranging (LIDAR) system at the Hazaki Oceanographical Research Station (HORS) from September 17 to 26, 2013. In order to investigate the impact of atmospheric stability, wind profiles observed at HORS were compared with a log profile model (theoretical wind profile model), which did not consider atmospheric stability. The wind shear was smaller in the observed profiles when the wind came from sea to land, and larger when it came from land to sea. It was also found that the wind profiles included an obvious diurnal cycle when the wind came from land to sea. The results for this study indicate that atmospheric stability is a significant factor when determining the coastal wind profiles, not only when the wind comes from sea sectors, but also from land sectors.
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  • Assessment of Initial Capital Cost for Bottom-mounted Offshore Wind Farms by Using Engineering Model and Its Verification
    Yuka KIKUCHI, Takeshi ISHIHARA
    2014 Volume 38 Issue 2 Pages A_36-A_43
    Published: 2014
    Released on J-STAGE: September 30, 2016
    DOIhttps://doi.org/10.11333/jwea.38.2_A_36
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    Initial capital costs of bottom-mounted offshore wind farms are analyzed by using an engineering model considering water depth, distance of coast and number of turbines. The parameters in the engineering model are identified with detailed cost data of a standard wind farm. The initial capital costs of the existing bottom-mounted offshore wind farms calculated by the engineering model and a parametric model are compared with the existing cost data in Europe. The engineering model shows a good agreement with the existing data by taking account of the size increase effect of wind turbine and construction vessels, the parametric model underestimates some existing data. Scenarios for the initial capital cost reduction in Japan are discussed.
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