Design and Manufacturing of a Safety-Critical Aircraft Krueger Flap
The Clean Sky BLADE research project provides a flight test demonstrator displaying industrially mature Natural Laminar Flow (NLF) wing sections. For max 10 flights at the end of the test campaign, fixed Krueger flaps designed and manufactured at ASCO Industries in the frame of the DEAMAK project will be mounted on the inboard portion of the new A340-300 NLF outer wing sections. These Krueger flaps will be flight tested at low altitude to examine their insect-shielding effect, which is crucial to a successful NLF wing application. The ASCO components were engineered using a multi-cell approach for damage tolerance and manufacturability improvement, in close collaboration with the production site which is of uttermost importance to come up with an industrially viable design. After a general introduction during which the ASCO group, the general trend to increase the use of composite materials on civil aircraft and the DEAMAK project are presented, five aspects of the engineering work done at ASCO in the frame of DEAMAK are outlined. First of all, the four main material selection criteria and the final material choice (CFRP consisting of 5H satin weave and RTM6 resin) are presented. Subsequently, the reasons for using an RTM process are presented, next to the five most important design drivers of the DEAMAK Krueger flaps. The various composite flap sizing activities which were carried out are listed and the testing done for three specific purposes is presented. Finally, general conclusions are drawn and an outlook of the future is given.
Authors: Michaël Raets, Alexander Verhuizen, Stein Janssen
Conference: SAMPE Europe Conference 2016