EUROSHOCK I and II: A survey - Drag Reduktion by Shock and Boundary Layer Control

Kurzfassung

A survey is presented of the EU-projects EUROSHOCK I and II concerned with the experimental and numerical investigation of various means of passive and active shock and boundary layer control and their effect on cruise performance in terms of cruise drag and/or speed and on the off-design performance, i.e., essentially the drag-rise and buffet boundaries, of transonic airfoils and wings. Presented are the setup of the projects and the respective partners as well as representative results which indicated that, for instance, through shock control by a contour bump in the shock region, airfoil drag reductions of up to 23% could be achieved. Applying this type of control to a laminar-type wing of a large transport aircraft resulted in considerable reductions in Cash Operating Costs.