Wind Engineers, JAWE
Online ISSN : 1883-8413
Print ISSN : 0912-1935
ISSN-L : 0912-1935
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Volume 1984, Issue 18
Displaying 1-6 of 6 articles from this issue
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  • Study on characteristics of a Savonius windmill power system with a d.c. generator
    Takayuki SUZUKI, Kazushige KUROKAWA
    1984 Volume 1984 Issue 18 Pages 3-10
    Published: January 01, 1984
    Released on J-STAGE: September 28, 2010
    DOIhttps://doi.org/10.5359/jawe.1984.3
    JOURNAL FREE ACCESS
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    In recent years there has been renewed interest in harnessing an ancient energy - the wind.The propeller aeroturbine has attained the highest degree of development. However, because the methods for analytically predicting the characteristics of a Savonius windmill are not available, it has not been possible to carry out a detailed design of this type of windmill power system.
    This paper discusses the performance characteristics of a Savonius wind turbine power system with a d.c.generator.The theoretical results agreecomparatively well with the experimental results.The effects of changes in wind speed and loadresistance on the performance are discussed.
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  • Cross-Ventilation by Natural Wind through Apartment Houses and Air Flow around Them
    Tadahisa KATAYAMA, Akio ISHII, Jun-ichiro TSUTSUMI, Teruaki FUKUDA, To ...
    1984 Volume 1984 Issue 18 Pages 11-19
    Published: January 01, 1984
    Released on J-STAGE: September 28, 2010
    DOIhttps://doi.org/10.5359/jawe.1984.11
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    Cross-ventilation by natural wind, one of the most popular and traditional cooling means against the heat of summer in Japan, is deficient in field data.So the authors conducted the field survey in a housing estate, including not only the measurements of wind direction and speed over the roofs, air flow velocities at the openings and in the rooms, etc., to examine air flow characteristics inside and outside the apartment houses, but also the measurements of air temperature and humidity to estimate the effect of cross-ventilation on thermal comfort.
    Main conclusions are as follows: 1) sea and land breezes are dominant in the investigated site 2) air flow increases its velocity, as approaching the opening window and decreases soon after passing the inlet into the room;3) air flow velocity at the center of the inlet window nearly equals to the averaged velocity in the inlet;4) air flow velocities in the dwelling unit are much correlated with and proportional to the over-roof wind speed, so that the formers can be easily estimated by the latter;5) relative air flow velocity in a room is large in the center and small in the corner;6) cross-ventilation considerably decreases ET* (New Effective Temperature).
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  • Structural Design of Large Scale Antennas Against Winds
    Kenzo TSUKADA, Yukihiko TAKIZAWA, Kenji AKABANE
    1984 Volume 1984 Issue 18 Pages 21-30
    Published: January 01, 1984
    Released on J-STAGE: September 28, 2010
    DOIhttps://doi.org/10.5359/jawe.1984.21
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    Parabolic antennas without radome are usually used for satellite communications antennas and radio telescopes from viewpoints of electrical performance, economy and so on. Therefore, the antenna structure is exposed to natural environment such as winds and solar radiation, and these disturbances cause structural deformation which greatly affects antenna performance.In this sense it is important to investigate winds effect including probability of wind generation for designing antenna structure.
    Design wind velocity, wind load on the antenna and influence of winds onto surface accuracy and pointing accuracy related to electrical performance are described in this paper refering to a 45 in radio telescope recently constructed at Nobeyama, Nagano Pref.
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  • Wind Tunnels of Dept.of Civil Eng., Kyushu Institute of Technology
    Yoshinobu Kubo, Kusuo Kato
    1984 Volume 1984 Issue 18 Pages 31-36
    Published: January 01, 1984
    Released on J-STAGE: September 28, 2010
    DOIhttps://doi.org/10.5359/jawe.1984.31
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    The three wind tunnels aresettled at Dep.of Civil Eng., Kyushu Institute of Technology. One is the closed circuit windtunnel with working section of 40×40×200cm which is used for mainly flow visualization.Other two open circuit wind tunnels.The one is Aerodynamics Wind Tunnel with working section 107×107×664 cm, the another is Boundary Layer Wind Tunnel with Wave Tank which has movable ceiling to control the produced boundary layer and to up the apparatus to produce the wind waves.The working section for the wind tunnel is width 240×length 2500 cmand the wave tank under wind tunnel is 120 (w) ×150 (h) ×2070 (1) cm.The Boundry Layer Wind Tunnel and the Wave Tank can be used in either separated form or coabined form.
    These apparatus are shown in detail in this paper.
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  • [title in Japanese]
    1984 Volume 1984 Issue 18 Pages 37-46
    Published: January 01, 1984
    Released on J-STAGE: September 28, 2010
    DOIhttps://doi.org/10.5359/jawe.1984.37
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  • Erratum to : Flow Around a Rectangular Cylinder with a Section of Various Width/Height Ratios
    1984 Volume 1984 Issue 18 Pages 50
    Published: 1984
    Released on J-STAGE: September 28, 2010
    DOIhttps://doi.org/10.5359/jawe.1984.18_50
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