Study on Dynamic Aerodynamic Coefficients Based on Wind Tunnel Test

The quasi-static assumption is used when studying the iced conductor galloping problem. The steady-state aerodynamic coefficient obtained from the wind tunnel test is used for the iced conductor galloping analysis. The quasi-static assumption is not fully applicable because the aerodynamic force of the conductor changes with the speed of the conductor. Therefore, it is necessary to conduct a dynamic wind tunnel test to obtain the dynamic aerodynamic coefficient of the iced conductor, analyze its dynamic aerodynamic characteristics, compare the difference between the dynamic aerodynamic force and the static aerodynamic force, and discuss the applicability of the static assumption. In order to verify the applicability of the quasi-static hypothesis (QST), a MATLAB program was written based on the quasi-static theory, and the conversion of static aerodynamic coefficients to dynamic aerodynamic coefficients was realized. The dynamic aerodynamic coefficients obtained in the two cases are compared. The results show that the dynamic aerodynamic coefficients based on the quasi-static theory (QST) are numerically different from the wind tunnel test results, but the curve changes of the two are the same, proving that the quasi-static hypothesis has certain applicability.