大気乱流中における多面体形静圧検出装置の試作について

Abstract

The feasibility of a omnidirectional probe of the static pressure in the atomospheric boundarylayer was investigated by using the internal pressure of a perforated globe with circular risescorresponding to 32-hedron and the dynamic pressure observed by an anemometer. In thewind tunnel test there were two kinds of flow pattern due to the wind directions; one was sym-metrical and the other asymmetrical. The quasi-steady condition required the wavelengthbeyond 200 times diameter of the globe in consequence of the flow directional oscillation testin the uniform flow. The variations of the internal pressure and dynamic pressure in the fieldtest correlated only in strong gusts with peak speed over 10 m/sec at 2 m height of ground. Theinternal pressure coefficient could be derived from the correlation coefficient between those pres-sures and coinsided with that of the wind tunnel smooth flow. The static pressure detector ofpolyhedron type is hopeful, if the number of facets increases and the frequency response of theinternal pressure is measured elaborately.