SOME EFFECTS OF BLADE CHARACTERISTICS ON COMPRESSOR NOISE LEVEL

Abstract

Sound power level and airflow measurements were obtained for flat, cambered, and airfoil blades, with and without twist. A single-stage axial flow compressor or fan of low pressure ratio was used, the simplified design being dictated by the variety of blade shapes tested. Data are given for the dependence of sound power level on flow coefficient, air weight flow, relative tip velocity, and rotational speed. The sound power per unit weight flow appears to be independent of blade shape. The discrete-frequency noise from a freely running rotor is predicted to an order of magnitude in agreement with experimental results by an equation that is intuitively derived from an extension of propeller theory.

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1966
Accession Number
AD0647221

Entities

People

  • Andrea Anderson
  • B. Hulse
  • C. Pearson
  • M. Abbona

Organizations

  • Boeing Commercial Airplanes

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Acoustic Absorption
  • Acoustic Properties
  • Acoustics
  • Aircrafts
  • Boundary Layer
  • Compressors
  • Field Conditions
  • Geometry
  • Jet Engines
  • Mach Number
  • Measurement
  • Noise Reduction
  • Plastic Explosives
  • Pressure Distribution
  • Propeller Noise
  • Trailing Edges
  • Turbofan Engines

Fields of Study

  • Physics

Readers

  • Aerodynamics/Aeronautics.
  • Electrical Engineering
  • Fluid Dynamics.