24th Congress of International Council of the Aeronautical Sciences, 29 August-3, September 2004, Yokohama, Japan
Paper ICAS 2004-3.4.R (St.).1

INVESTIGATION OF ROTOR NOISE PREDICTION USING DIFFERENT AEROACOUSTIC METHODS IN TIME DOMAIN

Z. Han, W. Song, Z. Qiao
Northwestern Polytechnical University, Xi’an, 710072, PRC

Keywords: helicopter rotors, acoustic noise, unsteady flow, Ffowcs Williams-Hawking , equation, Kirchhoff method

The aeroacoustic noise generated by helicopter rotors in hover and forward flight was predicted using two time-domain methods, namely Kirchhoff method solving the general wave equation and the Farassat method solving the FW-H (Ffowcs Williams-Hawkings) equation applied to a permeable surface.

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