Experimental Study on the Influence Factors of Static Aerodynamic Characteristics of Ice-Coated Commonly Used Conductors

Abstract

For conductors commonly used in the high and ultra-high voltage transmission projects, research was conducted on how ice shape, ice thickness, wind speed and angle of attack affect the static aerodynamic characteristics of ice-coated conductor. The ice shape and the shape of ice-coated conductor are both important factors that determine the aerodynamic characteristics of conductor. Sudden increase of lift coefficient may happen at low angle of attack. Wind speed shows less effect on aerodynamic characteristics of ice-coated conductor with streamlined shape than that of conductor with blunt shape. Under most attack angles, aerodynamic coefficients increase as the ice thickness increases. The aerodynamic load on ice-coated conductor does not increase linearly with the diameter of conductor.

Critical effect of fore-aft tapering on galloping triggering for a trapezoidal body

“…It is known that the shape of the outline of a structure is an important factor that determines whether a galloping instability occurs. Galloping behaviour is commonly encountered for elastically mounted objects with non-circular cross-sections (such as crescent-shaped, fan-shaped or D-shaped cross-sections) submerged in high-speed liquid or air (Païdoussis et al 2010;Huang & Li 2013). For instance, unlike the FIV response of a circular cylinder that will transfer into desynchronization after the lock-in range with increasing inflow velocity, the FIV response of a square cylinder will involve galloping instability (Zhao 2015;Zhao et al 2019).…”