DFVLR/FAA (Deutsche Forschungs-und Versuchsanstalt fuer Luft und Raumfahrt/Federal Aviation Administration) Propeller Noise Tests in the German- Dutch Wind Tunnel DNW

Abstract

A joint effort to develop high quality propeller acoustics data, which could be used by manufacturers for acoustic design purposes, and by researchers to validate established or newly developed theoretical noise prediction methods. Specifically, the program addressed propeller Mach number and disc plane attitude effects as related to noise certification test and evaluation procedures. Changes in Mach number, as they affect acoustic data adjustments, were explored through independent variation of tunnel flow velocity, propeller rotational speed and ambient air temperature. The tests on the effect of in flow angle on propeller noise also incorporated the influence of a typical engine nacelle on the flow field and, hence, on the propeller noise. In this report, acoustic and operational data acquisition and reduction procedures are described. Only a selection of typical test results is presented, in order to illustrate the acoustic analysis techniques.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1986
Accession Number
ADA174976

Entities

People

  • Hanno H. Heller
  • James E. Densmore
  • John O. Powers
  • Werner M. Dobrzynski

Tags

Communities of Interest

  • Energy and Power Technologies
  • Sensors

DTIC Thesaurus Topics

  • Acoustic Propagation
  • Acoustic Waves
  • Acoustics
  • Aircrafts
  • Band Spectra
  • Data Analysis
  • Data Processing
  • Explosives
  • Mach Number
  • Measurement
  • Plastic Explosives
  • Power Spectra
  • Propeller Noise
  • Sound Pressure
  • Test And Evaluation
  • Waveforms
  • Wind Tunnels

Fields of Study

  • Physics

Readers

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  • Software Engineering