Transonic Rotor Noise - Theoretical and Experimental Comparisons,

Abstract

Two complementary methods of describing the high-speed rotor noise problem are discussed. The first method uses the second-order transonic potential equation to define and characterize the nature of the aerodynamic and acoustic fields and to explain the appearance of radiating shock waves. The second employs the Ffowcs Williams and Hawkings equation to successfully calculate the acoustic far-field. Good agreement between theoretical and experimental waveforms is shown for transonic hover tip Mach numbers from 0.8 to 0.9. (Author)

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1980
Accession Number
ADA090806

Entities

People

  • F. H. Schmitz
  • Y. H. Yu

Tags

DTIC Thesaurus Topics

  • Acoustic Fields
  • Acoustic Signatures
  • Agreements
  • Blade Tips
  • Computational Science
  • Coordinate Systems
  • Differential Equations
  • Equations
  • Far Field
  • Flow Fields
  • Mach Number
  • Near Field
  • Radiation
  • Shock Waves
  • Two Dimensional
  • Waveforms
  • Waves

Fields of Study

  • Physics

Readers

  • Aerodynamics.
  • Electromagnetic Wave Scattering and Antenna Radiation Engineering
  • Theoretical Analysis.