T. Yumino, H. Sugawara, Y. Tanabe, M. Kameda

Aerodynamic lift variations of an isolated coaxial rotor system were analyzed by a computational fluid dynamics (CFD) approach. The study focused on a coaxial rotor configuration equipped with four blades per rotor and employed rFlow3D, a CFD solver specifically tailored for rotorcraft analyses. The analysis focuses on the high-speed forward flight with an advance ratio of 0.6 or higher, which is the ratio of the forward speed to the rotor tip speed. The numerical findings demonstrate a significant reduction in lift variation and reveal that the appropriate inter-rotor phase angle holds the potential to minimize the fluctuation to a level akin to that experienced during hovering. This reduction can be attributed to the mitigation of the vibrational component associated with the number of blades per rotor revolution. A detailed analysis further reveals that the pitching and rolling moments exhibit opposing changes in response to variations in the inter-rotor phase angle.

49th European Rotorcraft Forum 2023, Bückeburg, 2023

Conference Paper

englisch

21,0 x 29,7 cm, 9 Seiten

DGLR-Bericht, 2023, 2023-01, 49th European Rotorcraft Forum 2023 - Proceedings; S.1-9; 2023; Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn

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2023