DFVLR/FAA (Deutsche Forschungs-und Versuchsanstalt fuer Luft und Raumfahrt/Federal Aviation Administration) Propeller Noise Tests in the German-Dutch Wind Tunnel DNW. Appendix 1. Basic Test-Program (Propeller 1: Thickness 6. 4%, Round Tip-Shape)

Abstract

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 Appendix the results from the basic test-program (Propeller 1: Thickness 6.4%, round tip-shape) are documented in terms of pressure time histories, narrow band spectra and unweighted as well as A weighted overall sound pressure levels, together with supplementary information necessary for further data interpretation.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1986
Accession Number
ADA174977

Entities

People

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

Tags

DTIC Thesaurus Topics

  • Acoustics
  • Air Temperature
  • Band Spectra
  • Data Acquisition
  • Data Analysis
  • Frequency
  • History
  • Mach Number
  • Noise
  • Power Spectra
  • Propeller Noise
  • Propellers
  • Sound Pressure
  • Spectra
  • Test And Evaluation
  • Unmanned Vehicles
  • Wind Tunnels

Fields of Study

  • Physics

Readers

  • Aerospace Engineering
  • Fluid Dynamics.
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