Analysis of aerodynamic noise by distributed monopole method

Koji Takahashi, Shojiro Kaji

Research output: Contribution to journalArticle

Abstract

Aerodynamic acoustic problems near plate edges are treated by a new method based on the linear theory. For sound radiation and generation problems, we can calculate one of the half acoustic fields divided by semi-infinite plates by determining the distributions of the acoustic monopoles. Some numerical calculations confirm the validity of this distributed monopole method. Applying this method, we can impose the Kutta condition explicitly at the trailing edge and explain the feedback mechanism in terms of sound wave effects on the flow field. The generation of vorticity waves at the trailing edge due to the incident sound wave is calculated and the possibility of self-excited tones between the trailing edge and the leading edge is verified. The relationship obtained is the same as that of the edge tone phenomenon, and the necessary amplification of the vortex during its convection for the sound to become self-excited is quantified.

Original languageEnglish
Pages (from-to)86-100
Number of pages15
JournalJSME International Journal, Series B: Fluids and Thermal Engineering
Volume39
Issue number1
Publication statusPublished - Feb 1 1996

Fingerprint

aerodynamic noise
Acoustic noise
monopoles
Aerodynamics
Acoustic waves
trailing edges
acoustics
sound waves
Acoustics
Wave effects
Acoustic fields
Vorticity
Amplification
Flow fields
leading edges
Vortex flow
aerodynamics
vorticity
Feedback
flow distribution

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Physical and Theoretical Chemistry
  • Fluid Flow and Transfer Processes

Cite this

Analysis of aerodynamic noise by distributed monopole method. / Takahashi, Koji; Kaji, Shojiro.

In: JSME International Journal, Series B: Fluids and Thermal Engineering, Vol. 39, No. 1, 01.02.1996, p. 86-100.

Research output: Contribution to journalArticle

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