The impact of cavity geometry on the source of acoustic resonance (Helmholtz or quarter-wave) for synthetic jet type cavities is presented. The cavity resonance was measured through externally excited microphone measurements. It was found that, for pancake-shaped cavities, the Helmholtz resonance equation was inadequate (off by more than 130%) at predicting the acoustic cavity resonances associated with synthetic jet actuation, whereas a two-dimensional quarter-wave resonance was accurate to 15%. The changes in the geometry (cavity diameter, cavity height, and orifice length) could alter the cavity resonance by up to 50%, and a finite element solver was accurate at predicting this resonance in all cases. With better knowledge of the phenomena governing the acoustic resonance, prediction of the cavity resonance can become more accurate and improvements to current prediction tools can be made.
Synthetic Jet Actuator Cavity Acoustics: Helmholtz Versus Quarter-Wave Resonance
Mechanical Aerospace and Nuclear Engineering,
Center for Flow Physics and Control,
Contributed by the Noise Control and Acoustics Division of ASME for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received September 25, 2014; final manuscript received February 20, 2015; published online April 27, 2015. Assoc. Editor: Theodore Farabee.
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Van Buren, T., Whalen, E., and Amitay, M. (October 1, 2015). "Synthetic Jet Actuator Cavity Acoustics: Helmholtz Versus Quarter-Wave Resonance." ASME. J. Vib. Acoust. October 2015; 137(5): 054501. https://doi.org/10.1115/1.4030216
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