Experimental analysis on aero-loading of wing skin with icing accretion

Ice accretion changes the aerodynamic shape and flow field of the airfoil, which makes the aerodynamic load distribution of the wing change dynamically. The skin, as the object of bearing and transferring aero-loading, produces different vibration responses under its dynamic action. Taking a large camber and thick airfoil as an object, the vibration characteristics of the upper and lower skins of the trailing edge under the typical icing condition are extracted, the load spectrum is used to study the skin vibration and flow field changes, and the structural stability of different skin is investigated. The results show that: Different skins have different load sensing performance for the ice-induced detached vortices and trailing edge separated vortices; the load spectrum and energy are relatively concentrated for the rigid skin while scattered for the flexible skin; as the ice accretes, the dominant frequency of detached vortices decreases slightly, substrate ice causes wide-width and high-frequency vibration, and the mixing of detached vortices and the wake results in the increase of the loading energy around the trailing edge.