Flow structure and flow-induced noise in an axisymmetric cavity with lids
- 90 Downloads
Direct numerical simulations of incompressible turbulent flow through an axisymmetric cavity with or without lids were performed at Ret,in = 186 to examine the hydrodynamic effects of the lids on the flow-induced noise. The strength of the recirculation in the downstream region was weakened by the installation of the lids. Comparison of the acoustic sources of the Lighthill equation indicated that the lid in the downstream region attenuated the flow-induced noise substantially. Frequency spectra and spatio-temporal correlations of pressure fluctuations revealed the most energetic mode and the convective nature of the flow over the cavity. It was evident from a detailed investigation of the instantaneous flow fields that the introduction of lids into the cavity significantly weakened the interaction between the separated shear layer and the trailing edge of the cavity. The present results clearly showed that the installation of lids is an effective means of reducing flow-induced noise.
KeywordsAxisymmetric cavity Direct numerical simulation Flow-induced noise Vortex-corner interaction
Unable to display preview. Download preview PDF.
- J. E. Rossiter, Wind-tunnel experiments on the flow over rectangular cavities at subsonic and transonic speeds, Aeronautical Research Council Reports and Memoranda, 3438 (1964).Google Scholar
- E. B. Plentovich, R. L. Stalling and M. B. Tracy, Experimental cavity pressure measurements at subsonic and transonic speeds, NASA TP, 3358 (1993).Google Scholar
- K. Krishnamurty, Sound radiation from surface cutouts in high speed flow, Ph.D. Thesis, California Institute of Technology (1956).Google Scholar
- D. Rockwell and E. Naudascher, Review-self-sustaining oscillations of flow past cavities, Trans. ASME: J. Fluids Eng., 100 (1978) 152–165.Google Scholar
- C. M. Shieh and P. J. Morris, Parallel numerical simulation of subsonic cavity noise, AIAA Paper (1999) 99–1891.Google Scholar
- X. Gloerfelt, C. Bogey, C. Bailly and D. Juve, Aerodynamic noise induced by laminar and turbulent boundary layers over rectangular cavities, AIAA Paper (2002) 2002–2476.Google Scholar
- J. C. F. Pereira and J. M. M. Sousa, Experimental and numerical investigation on flow oscillations in a rectangular cavity, Trans. ASME: J. Fluids Eng., 117 (1995) 68–74.Google Scholar
- D. N. Heo and D. J. Lee, Numerical investigation of the cover-plates effects on the rectangular cavity flow, AIAA Paper (2001) 2001–2127.Google Scholar
- M. L. Munjal, Acoustics of ducts and mufflers, Wiley-Interscience, New-York (1987).Google Scholar