覆冰八分裂导线的轮廓特征对气动特性的影响研究OA

This paper aims to reveal the influence mechanism of the real stranded profile of crescent-shaped iced eight-bundled conductors on aerodynamic characteristics and galloping stability to solve the problem of large error in the traditional smooth cylindrical conductor model.By combining the wind tunnel test and the numerical simulation,the aerodynamic force coefficient and Den Hartog vertical galloping mechanism coefficient of the smooth cylindrical conductor model and stranded conductor model are com-pared.The results show that the stranded conductor model can significantly enhance the lift coefficient.The mean absolute error decreases from 0.118 to 0.059,with a reduction of 50.0％.The error of the drag co-efficient decreases from 0.199 to 0.109,with a reduction of 45.2％.The errors of aerodynamic force coef-ficients at critical angles of attack are greatly reduced.Numerical simulation verifies that the stranded tex-ture optimizes wake separation,reducing the error of the Den Hartog coefficient by 47.6％.The results show that the conductor profile characteristics directly affect the aerodynamic instability mechanism,and pro-vides a reference for the numerical simulation method of crescent-shaped iced eight-bundled conductors.