title: Aeroacoustic response of coaxial wall-mounted Helmholtz resonators in a low-speed wind tunnel.
abstract: The aeroacoustic response of coaxial wall-mounted Helmholtz resonators with different neck geometries in a low-speed wind tunnel has been investigated. Experimental test results of this system reveal a strong aeroacoustic response over a Strouhal number range of 0.25 to 0.1 for both increasing and decreasing the flow rate in the wind tunnel. Aeroacoustic response in the low-amplitude range O(10(-3)) < Vac/Vflow < O(10(-1)) 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.
authors.affiliation: Department of Physics and Astronomy, The University of Central Arkansas, 201 Donaghey Avenue, Conway, Arkansas 72035-0001.
authors.forename: William V
authors.initials: WV
authors.lastname: Slaton
authors.affiliation: Department of Physics and Astronomy, The University of Mississippi, 108 Lewis Hall, University, Mississippi 38677-1848.
authors.forename: Asami
authors.initials: A
authors.lastname: Nishikawa