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Experimental study on correlation between turbulence and sound in a subsonic wind tunnel

Dehghan Manshadi, M ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1007/s10409-010-0362-3
  3. Abstract:
  4. In this paper, the effects of turbulence on sound generation and velocity fluctuations due to pressure waves in a large subsonic wind tunnel are studied. A trip strip located at different positions in the contraction part or at one position in the diffuser of a large wind tunnel is used to investigate the aforementioned phenomenon, and the results indicate that the trip strip has significant effects on sound reduction. The lowest turbulence intensity and sound are obtained from a trip strip with a diameter of 0.91mm located either at X/L = 0.79 or at X/L = 0.115 in the wide portion of the contraction. Furthermore, the effect of monopole, dipole and quad- rupole sources of aerodynamic noise at different velocities is investigated, and it is demonstrated that the contribution of the monopole is dominant, while the shares due to the dipole and quadrupole remain less important. In addition, it is found that the sound waves have a modest impact on the measured longitudinal turbulence and are generated essentially by eddies
  5. Keywords:
  6. Correlation ; Quadrupole term ; Wind tunnel ; Aerodynamic noise ; Experimental studies ; Pressure waves ; Quadrupoles ; Sound ; Sound generation ; Sound reduction ; Sound waves ; Subsonic wind tunnels ; Trip strips ; Turbulence intensity ; Velocity fluctuations ; Aerodynamics ; Subsonic flow ; Wind tunnels
  7. Source: Acta Mechanica Sinica/Lixue Xuebao ; Volume 26, Issue 4 , 2010 , Pages 531-539 ; 05677718 (ISSN)
  8. URL: http://link.springer.com/article/10.1007%2Fs10409-010-0362-3