Airfoil Leading-Edge Riblets for Turbine Engine Ice Control

The leading edge surface is segmented into multiple riblets (raised structures) that divide the ice accumulation into separate sections. This segmentation prevents large continuous ice sheets from forming, instead creating smaller ice particles that are less likely to cause damage when they break free. The riblets create physical divisions that interrupt ice continuity across the leading edge surface.

The riblets are positioned specifically on the leading edge where ice accumulation is most problematic. By concentrating the riblet structures in this critical local area, the invention targets the specific location where ice causes the most harm, while leaving other parts of the airfoil unchanged. The local modification of the leading edge geometry provides ice control precisely where needed.

The riblet structure creates a micro-porous or textured surface on the leading edge. This porous-like geometry at the micro-scale allows the surface to interact with ice-forming moisture in a way that prevents accumulation, while the overall airfoil structure remains intact. The riblets effectively create a controlled surface topology that manages ice formation without requiring complete structural redesign.

The invention adds a third dimension to the leading edge surface by creating raised riblet structures. Instead of modifying the airfoil in the traditional two-dimensional planform, the solution introduces vertical relief features that add complexity in the depth dimension. This dimensional addition provides ice control functionality while maintaining the original airfoil geometry in plan view.