The Influence of Leading Edge Serrations on the Noise Radiation from a Statically Thrusting Rotor.
Abstract
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 L/D. Hot wire data are analyzed. (Author Modified Abstract)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 09, 1972
- Accession Number
- AD0759028
Entities
People
- Robert T. Nagel
Organizations
- Pennsylvania State University