Accession Number:

AD0759028

Title:

The Influence of Leading Edge Serrations on the Noise Radiation from a Statically Thrusting Rotor.

Descriptive Note:

Technical memo.,

Corporate Author:

PENNSYLVANIA STATE UNIV UNIVERSITY PARK ORDNANCE RESEARCH LAB

Personal Author(s):

Report Date:

1972-08-09

Pagination or Media Count:

137.0

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 LD. Hot wire data are analyzed. Author Modified Abstract

Subject Categories:

  • VSTOL
  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE