Wind Engineers, JAWE
Online ISSN : 1883-8413
Print ISSN : 0912-1935
ISSN-L : 0912-1935
Volume 1983, Issue 17
Displaying 1-5 of 5 articles from this issue
  • Atsushi OKAJIMA
    1983 Volume 1983 Issue 17 Pages 1-19
    Published: September 30, 1983
    Released on J-STAGE: September 28, 2010
    JOURNAL FREE ACCESS
    Strouhal number and base pressure of rectangular cylinders with a section of a width/height ratio of 0.8-9 were measured both in wind-tunnels and in a towing tank, in a wide range of Reynolds numbers between 102 and 105.It was found that there exists a certain range of Reynolds numbers where a sudden discontinuity occurs in Strouhal-number curves for rectangular cylinders with the width/height ratio between 1.5 and 3.In addition, we have found an existence of a new critical value of the width/height ratio, i.e., 6, being different from 2.8, at high Reynolds numbers (Re 104).The change of flow pattern corresponding to the discontinuity was confirmed by measurements of velocity profiles and the visualization techniques of a smoke-wire and an aluminum dust methods.
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  • Masao TACHIKAWA
    1983 Volume 1983 Issue 17 Pages 21-30
    Published: September 30, 1983
    Released on J-STAGE: September 28, 2010
    JOURNAL FREE ACCESS
    Free-flight tests of plates and prisms were carried out in a wind tunnel uniform flow, The results are compared with those of numerical integration of equations of motion based on experimentally obtained aerodynamic characteristics of rotating bodies.
    It is shown that the trajectory of a missile released into a flow from rest is distributed in a wide range, which has a circular cross section, and the upper limit of the distribution can be predicted approximately by the numerical integration method.
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  • Yu FUKUNISHI
    1983 Volume 1983 Issue 17 Pages 31-40
    Published: September 30, 1983
    Released on J-STAGE: September 28, 2010
    JOURNAL FREE ACCESS
    Some new techniques for the measurement in wind tunnels are presented.Hand-made micro-computer systems are used in most of our experimental works.They are used both as a data processor and an apparatus controller.We introduce how they are used in our experiments for the conditional sampling.As an apparatus controller, they are used in flow visualization experiments.They control both smoke and flood light.A multi-probe anemometer with 24 hotwires is also explained.
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  • Kazushi OGAWA, Yoshinori SAKAI, Kazutoshi MATSUDA
    1983 Volume 1983 Issue 17 Pages 41-50
    Published: September 30, 1983
    Released on J-STAGE: September 28, 2010
    JOURNAL FREE ACCESS
    In order to extend the facilities for investigating aerodynamic stability of structures, we have installed a new low speed wind tunnel of the Göttingen type (overall length of wind path; 107m) at our Technical Research Institute at Akashi in 1982.
    The test section of this wind tunnel is 3.0m in height, 2.5m in width and 20.0m in length. Therefore it can simulate an atmospheric boundery leyer.
    Wind velocity is able to vary from 0.2m/sec to 25m/sec.The Uniformity of the velocity distribution is less than ±0.3%, the turbulence intensity less than 0.2%, and the static pressure distribbtion less than 0.66%/m. This paper outlines the above-mentioned characteristics and performance of this newly built wind tunnel.
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  • 1983 Volume 1983 Issue 17 Pages 58-85
    Published: September 30, 1983
    Released on J-STAGE: September 28, 2010
    JOURNAL FREE ACCESS
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