強風時における風の乱れの空間的構造

Abstract

The spatial structure of natural wind turbulence were studied by the use of the wind speed dataof the anemometer array of 720 m long. The decreasing rates of gust factors with increasinghorizontal averaging distance were evaluated and an experimental formula for them was ob-tained which contains the value of gust factor at one point as a parameter. Lateral space cor-relation shows very rapid decrease with increasing horizontal distance as compared to longi-tudinal correlation and almost no correlation are seen for separation more than 90 in. Fromthe data of longitudinal space time correlation, Taylor's frozen eddy hypothesis was checkedand the translation velocity of the eddy was estimated as 80% of the mean wind speed. Theresults of spactral analysis were also shown.