A Study of Aerodynamic Coefficients on a Train Car Considering Turbulence Effects of Approaching Flow

摘要

In this study, aerodynamic coefficients of train cars are predicted considering turbulence effects of approaching flow. Firstly, wind tunnel tests are carried out to measure wind speeds, turbulence intensities, mean aerodynamic coefficients of a train car and mean pressures around a car-body in uniform and turbulent flows. A model is then proposed to predict aerodynamic coefficients in the turbulent flow from those obtained in the uniform flow, in which the differences of mean wind speed profiles and the mean pressures around the car-body in the uniform and turbulent flows as well as effects of fluctuating wind speed and direction are considered by using correction factors. The predicted aerodynamic coefficients by the proposed model show good agreement with those obtained from the wind tunnel test.