This paper examines the helicopter/ship dynamic interface by combining both experimental and numerical analysis. The flow field over the flight deck of a frigate model was mapped experimentally in a wind tunnel using both stationary and flying hot-film sensors. Using the velocity time-histories measured in the wind tunnel, a numerical representation of the airwake which shares the same spectral characteristics was generated. A blade-element model of the main rotor of a helicopter was then 'flown' in this numerical airwake to determine the steady and unsteady loads acting on the rotor. The results of a set of test simulations indicate: that an increase in unsteady rotor loads occurs when spatial cross-correlation functions are included in the generation of the numerical flow field; that the fluctuating vertical velocity has a greater effect on the unsteady rotor loads than the fluctuating horizontal velocity; that the spectra of unsteady forces and moments show similar broadband and resonant behaviour at different free-stream velocities.
Analysis of rotor forces in a ship airwake
Eine Untersuchung der Belastungen die auf ein Hubschrauberrotorblatt einwirken, das sich im Nachstrom eines Schiffes befindet
1995
12 Seiten, 8 Bilder, 1 Tabelle, 13 Quellen
Conference paper
English
Analysis of Rotor Forces in a Ship Airwake
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