Db. Signor et al., EFFECTS OF INGESTED ATMOSPHERIC-TURBULENCE ON MEASURED TAIL ROTOR ACOUSTICS, Journal of the American Helicopter Society, 41(1), 1996, pp. 77-90
Results from an outdoor hover test of a full-scale Lynx tail rotor are
presented, The investigation was designed to further the understandin
g of the acoustics of an isolated tail rotor hovering out-of-ground ef
fect in atmospheric turbulence, without the effects of the main rotor
wake or other helicopter components, Measurements include simultaneous
rotor performance, noise, inflow, and far-field atmospheric turbulenc
e. Results with grid-generated inflow turbulence are also presented. T
he effects of atmospheric turbulence ingestion on rotor noise are quan
tified, In contradiction to current linear theories, increasing rotor
inflow and rotor thrust were found to increase turbulence ingestion no
ise.