Influence of dynamic flap movement on maximum lift under consideration of aeroelastic effects

The project BIMOD deals with the analysis of periodically oscillating trailing edge flaps to maximize the high lift of aircraft. By exploiting the hysteresis effect, flaps can be deflected beyond the maximum flap angle for a short period of time without the flow being stalled. In this way, higher lift coefficients can be achieved compared to the static case. In the present project this principle is used to significantly reduce the weight of the flap structure using new technologies and thus make a contribution to eco-efficient aviation.

On the part of RWTH Aachen University, the Institute of Aerospace Systems (ILR) and the Institute for Structural Mechanics and Lightweight Design (SLA) are involved in the BIMOD project. The project comprises the entire preliminary design of a medium-range civil aircraft, which will be equipped with the above-mentionedtechnology, including detailed aeroelastic analysis. The necessary aerodynamic input data will be provided by the project partner (TUM). Furthermore, the basics for influencing the maximum lift by dynamic flap movement are experimentally investigated on a simplified model in the water channel. The results provide suitable oscillation frequencies of the trailing edge flaps, which in turn are used in numerical and experimental work.

The investigated technology will be investigated by means of a multidisciplinary preliminary design andassessment environment in a medium-haul commercial aircraft. Among other things, an economic/ecological evaluation is carried out.