Clean Sky 2 Deliverable D1.4.4.1-32 - Analysis of impact scenarios for different leading edge designs

Kurzfassung

This report discusses the effect of impact scenarios on a wing leading-edge design incorporating hybrid laminar flow control (HLFC) technology of a long-range aircraft. The fixed leading-edge structure is studied with respect to the integrity under the dynamic event of a bird strike. It is an open cross section at the upper wing side since the layout incorporates a Krueger flap extending on the lower wing nose. However, the influence of this moveable is not considered here. The considered HLFC design has a single duct or chamber between the outer skin of micro-perforated titanium and the inner composite structure. The reference for the impact load case is taken from the bird strike requirements given by the certification specifications for passenger aircraft of EASA and FAA, respectively. Reason for this approach is to accompany the maturing of HLFC technology with impact safety studies which is needed for future application in aviation. The HLFC-WIN (HLFC on wing) project is to develop a suction system integrated into the leading-edge structure that is suited for series production without trading in aerodynamic drag reduction potential. Besides weight efficiency the main driver for the load bearing leading edge sub structure are producibility and energy efficiency of the production process in order to improve the sustainability of the aircraft in total. In order to reach sustainability in the same way as safety, the HLFC lightweight structure shall be analysed against bird strike. Bird strike resilience is mandatory already when entering into flight testing.