Unsteady aerodynamic force measurement tests of four-bundled conductors using rotary devices with arbitrary waveforms

Abstract

In this study, to investigate unsteady aerodynamic force characteristics of the four-bundled conductors, aerodynamic measurement tests were performed using rotary devices that can input arbitrary waveforms. The aerodynamic force coefficients, which are defined as two-variables function of the angle of attack and the non-dimensional angular velocity, were measured in the tests with constant angular velocity. Then, the validity of the aerodynamic formulation using these two variables was confirmed by comparing the unsteady aerodynamic coefficients obtained by the forced vibration tests with sinusoidal wave.