Abstract
The aeroacoustic response of coaxial Helmholtz resonators with different neck geometries in a low-speed wind tunnel has been investigated. Experimental test results of this system reveal strong aeroacoustic response over a Strouhal number range of 0.25–0.1 for both increasing and decreasing the flow rate in the wind tunnel. Ninety-degree bends in the resonator necks does not significantly change the aeroacoustic response of the system. Aeroacoustic response in the low-amplitude range has been successfully modeled by describing-function analysis. This analysis, coupled with a turbulent flow velocity distribution model, gives reasonable values for the location in the flow of the undulating stream velocity that drives vortex shedding at the resonator mouth. Having an estimate for the stream velocity that drives the flow-excited resonance is crucial when employing the describing-function analysis to predict aeroacoustic response of resonators.
Published Version
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