This paper describes the interior acoustic pressure of a cylindrical cavity driven by a shear layer. Existing cavity flow literature is generally focused on rectangular cavities, where the resonance is either longitudinal or the result of excited depth modes inside the cavity. The design of the present circular cavity is such that azimuthal duct modes can be excited in various combinations with depth modes depending on free stream velocity. An acoustic simulation of the system was used to identify the modes as a function of frequency when the system is driven by an acoustic point source. With appropriate manipulation of the free stream flow, abrupt mode switching and mode oscillation were both observed, and a condition with a dominant azimuthal mode was found. The strength of the lock-on was documented for the various resonance conditions, and the effects of the cavity opening size and location were studied.
Shear Layer Driven Acoustic Modes in a Cylindrical Cavity
Meccanica e Industriale,
Via della Vasca navale,
Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received September 13, 2013; final manuscript received February 13, 2014; published online August 19, 2014. Assoc. Editor: Samir Ziada.
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Stephens, D. B., Verdugo, F. R., and Bennett, G. J. (August 19, 2014). "Shear Layer Driven Acoustic Modes in a Cylindrical Cavity." ASME. J. Pressure Vessel Technol. October 2014; 136(5): 051309. https://doi.org/10.1115/1.4026866
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