Citation

Wall BG. Aeronaut. J. 2019; 123(1267): 1374-1395.

Copyright

(Copyright © 2019, Royal Aeronautical Society, Publisher Cambridge University Press)

DOI

10.1017/aer.2019.59

PMID

unavailable

Abstract

The wake vortex of lifting surfaces such as wind turbine blades or fixed-wing aircraft can heavily affect the blade aerodynamics of rotorcraft. Using blade element theory, the pilot control inputs required to mitigate such vortex effects are estimated and compared to the available control margin at the operating condition of interest. In contrast, when no pilot action is performed, the rotor blade flapping caused by the vortex is evaluated and compared to available margins. It is a safety concern when the remaining margins become zero. The influence of the vortex strength, its core radius and orientation to the rotor disk are evaluated and the effect of rotor blade characteristics (Lock number, natural frequency) is investigated.

Language: en

Keywords

rotor blade flapping; rotor control; rotorcraft aerodynamics; rotorcraft safety; Vortex-Rotor Interference