自然風中にある角柱表面に作用する風圧変動に関する基礎的研究

Abstract

This paper describes the experiments of fluctuating wind pressure on a square cylinder in natu-ral wind.As the results of measurements some characteristics of fluctuating wind pressure were obtainedas follows.I. The spectral density of fluctuating pressure in higher frequencies on a windward wall wassmaller than that of fluctuating velocity pressure in free wind.2. The spectral density of fluctuating pressure on a leeward wall had a peak at nD/V=0.l.3. When the angle of nstack was zero, periodical pressure fluctuations on the walls of both sidesin wind direction were observed.4. The angle of attack had a marked influence on the characteristics of the fluctuating pres-sure on the walls of both sides in wind direction. In the case of the angle of attack 250 the spectraldensity of wind pressure fluctuation on one side of walls had a peak at nD/V=0. 12 due to vortexshedding but the spectral density of that on the other side had a tendency to decrease with thefrequency of pressure fluctuations increasing.