CHARACTERISTICS OF WIND FORCE ACTING ON INCLINED CIRCULAR CYLINDERS WITH YAW ANGLE

This study investigates the effects of inclination angle and yaw angle for wind forces acting on inclined circular cylinders. In this study, wind forces per unit length acting on the cylinders are measured simultaneously at all positions by using a manifold system. From this study, the following results are obtained; (1) The modal wind forces acting on the inclined circular cylinders and the Strouhal number are followed to the Cosine Rule or the Independence Principle. Those data are characterized by equivalent yaw angle, which combined with inclination angle and yaw angle. (2) The fluctuating across wind forces transmit from up-stream side to down-stream side in a constant speed. The transmission speed of the fluctuating across wind forces is able to be approximated to a liner function of equivalent yaw angle. (3) The characteristics of wind forces in a uniform flow and a turbulent flow are almost same.