J.W. Leverton, A.C. Pike

Research, conducted at Westland Helicopters Ltd. in the early 1970s under UK MOD and company funding, indicated the importance of main rotor wake/tail rotor interaction on the noise levels generated by helicopters at distance on approach and as the helicopter flies overhead. The investigations conducted using the Lynx Mkl confirmed the presence of two sources associated with the intersection by the tail rotor of the tip vortices shed by the main rotor. This explained the "burble" noise detected on approach and indicated the method by which the noise levels of the Lynx could be reduced. This research, which included theoretical modelling as well as experimental studies, lead to the design and flight evaluation of a Quiet Tail Rotor (Q.T/R) which demonstrated noise reductions of up to 15dB on approach and SdB(A) at overhead. This successful concept has been incorporated in the Lynx Mk7 and subsequent variants. To further enhance the performance of the Lynx family of helicopters the main rotor blades were recently replaced with BERP blades: this further aided the control of noise and as a result the latest versions of the high performance/high speed Lynx meets the most demanding civil certification standards.

DGLR/AIAA 14th Aeroacoustics Conference, 1992

Conference Paper

englisch

21,0 x 29,7 cm, 10 Seiten

DGLR-Bericht, 1992, 1992-03, DGLR/AIAA 14th Aeroacoustics Conference - Proceedings; S.532-541; 1992; Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn

NA

aeroacoustics, rotor aerodynamics, lynx helicopter

Bibliothek

1992