The Influence of Leading Edge Serrations on the Noise Radiation from a Statically Thrusting Rotor.
PENNSYLVANIA STATE UNIV UNIVERSITY PARK ORDNANCE RESEARCH LAB
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The noise attenuation effects of leading edge serrations on rotors is studied in detail. Total radiated power, far-field SPL, directivity patterns, near-field sound characteristics, rotor slip stream and wake characteristics, and flow patterns have been compared with rotors with and without leading edge devices. Near-field data were collected in a manner indicative of rotational noise components. A considerable noise reduction in the higher harmonics of rotational noise was detected. Thrust and torque data indicate that the addition of leading edge serrations results in a decrease in LD. Hot wire data are analyzed. Author Modified Abstract