人工芝上に発達した乱流境界層内の乱れの統計的性状について

Abstract

Statistical characteristics of the turbulent boundary layer above the artificial grasses areexperimentally investigated in a wind tunnel. Space time correlations and power spectra areobtained from the longitudinal wind speed fluctuation. Integral scales of turbulence are cal-culated by three different ways and compared with each other. The aspect ratio of the tur-bulent eddy obtained from the space correlations is three to five. Taylor's hypothesis ischecked by comparing the integral scales obtained form the space correlation with those fromthe autocorrelation. The ratio of the traveling speed of the turbulent eddy to the mean windspeed decreases with the height and the wind speed.