To improve knowledge of the wind loads on photovoltaic structures mounted on flat roofs at the high angles required in high latitudes, and to study starting flow on low aspect ratio wind turbine blades, a series of wind tunnel tests were undertaken. Thin flat plates of aspect ratios between 0.4 and 9.0 were mounted on a sensitive three-component instantaneous force and moment sensor. The Reynol...

In forward flight, slowing down a rotor alleviates compressibility effects on the advancing side blade tip, extending cruise speed limit, and inducing high-advance-ratio flight regime. Previous wind tunnel tests have shown that an articulated trimmed to zero hub moment generates limited thrust at high advance ratios, because needs be against retreating with significant reverse flow, where is in...

SUMMARY : The validity of wind-tunnel simulation of the noise radiated bv a moving source is studied. Theoretical corrections are derived thai allow acoustic measurements in a wind tunnel with microphones outside of the flow to be transposed to a real flight situation. Some corrected coaxial jet data are then compared with real flight data, CONTENTS

The objective of obtaining a spatially standardized steady stream of air across and along the test section of a wind tunnel has been considered by several researchers. When a wind tunnel is manufactured or montage or move to another position, the study about variation of pressure, Mach number, density and temperature distribution, the variation of pitch and yaw components of flow angularity, bo...

Abstract The structure of parabolic condensers makes them susceptible to wind load because their thin and large windward mirrors. In this paper, the pressure on a model condenser mirror (1:35) multistorey flat roofs is analysed via measurement in tunnel. mean wind-pressure distribution law flat-roof mirrors (including change with working conditions maximum characteristics) fluctuating extreme a...