ANALYSIS OF ROTOR FORCES IN A SHIP AIRWAKE

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Authors
  1. Syms, G.
  2. Zan, S.J.
Corporate Authors
Institute for Aerospace Research, Ottawa ONT (CAN);Chief of Research and Development, Ottawa ONT (CAN) Director Research and Development Air
Abstract
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: (1) that an increase in unsteady rotor loads occurs when spatial cross-correlation functions are included in the generation of the numerical flow field; (2) that the fluctuating vertical velocity has a greater effect on the unsteady rotor loads than the fluctuating horizontal velocity; and (3) that the spectra of unsteady forces and moments show similar broadband and resonant behaviour at different free-stream velocities.
Report Number
AGARD-CP-552-PAP-31 — CONTAINED IN 96-00588
Date of publication
01 Aug 1995
Number of Pages
12
DSTKIM No
96-00582
CANDIS No
153693
Format(s):
Document Image stored on Optical Disk;Hardcopy

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