Rectangular and modified two-dimensional cavities in an open-jet anechoic wind tunnel at low mach number

Schumacher, K.; Doolan, C.; Kelso, R.; Australasian Fluid Mechanics Conference

Rectangular and modified two-dimensional cavities in an open-jet anechoic wind tunnel at low mach number

2010

Schumacher, K. | Doolan, C. | Kelso, R. | Australasian Fluid Mechanics Conference (17th : 2010 : Auckland, New Zealand)

Experimental investigations are presented of noise from flow over unmodified and modified two-dimensional cavities at low Mach number, using an open-jet anechoic wind tunnel facility. The Reynolds numbers based on cavity depth were Re <inf>D</inf>=4100- 16500. Four cavity lengths were tested, which gave length-todepth (L/D) ratios of 1.17, 2.33, 3.5 and 4.67. There was a thin laminar boundary layer upstream of the cavity. The cavity was modified using sloped walls, a passive control technique for cavity flow noise. Such modifications were found to, typically, reduce overall sound pressure levels and to reduce the number or intensity of acoustic tones.

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K. Schumacher, C. Doolan and R. Kelso

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http://www.17afmc.com/17afmc/index.cfm?p=programme2

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