M. Firnhaber Beckers, M. Schollenberger, T. Lutz

Unsteady propeller-wing interaction effects of a distributed propulsion system in a high-lift case (lift coefficient of about 10) were investigated via unsteady Reynolds-averaged Navier-Stokes simulations. In a first stage, the turbulence model and time step were examined. The Spalart-Allmaras turbulence model was found to be the least dissipative model. The unsteady interaction effects were identified by isolating them from the steady-state effects. They are dominated by the behaviour and influence of the blade tip vortices, which was analysed in detail. However, the influence of the unsteady effects on the integral performance of the propeller-wing system was found to be negligible compared to the steady-state effects. The initial slipstream development process was simulated, revealing a duration of about 85 to 90 propeller revolutions until a periodic state is reached in this high-lift scenario. Different methods of representing the unsteady propeller motion were investigated and compared: fully resolved blades and the Actuator Line model. The latter proved to be significantly less computationally expensive, especially when the initial slipstream development process is skipped via an initial Actuator Disk simulation, with only about 12.5% of the computation cost of the fully resolved simulation.

Deutscher Luft- und Raumfahrtkongress 2023, Stuttgart

Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn, 2024

Conference Paper

englisch

21,0 x 29,7 cm, 13 Seiten

urn:nbn:de:101:1-2024032011303138609024

10.25967/610132

Distributed Electric Propulsion, High-Lift, Computational Fluid Dynamics

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Firnhaber Beckers, M.; Schollenberger, M.; Lutz, T. (2024): Numerical Simulation of the Unsteady Slipstream of Lift Augmenting Distributed Propellers. Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V.. (Text). https://doi.org/10.25967/610132. urn:nbn:de:101:1-2024032011303138609024.

20.03.2024