Effect of flow on a dual Helmholtz resonator

The acoustic characteristics of a dual Helmholtz resonator in the presence of flow is investigated theoretically and experimentally. A lumped parameter model is introduced, including the damping effect and neck inertia, and the predicted transmission loss (TL) is compared with experiments performed with a flow-impedance tube setup. ^Predicted and measured results with flow exhibit a good agreement, while capturing the key variations in peak TL magnitude and the shifts in peak TL frequency. Theoretical approach demonstrates that the damping of the first neck inertia of the dual Helmholtz resonator has a marked impact not only on the magnitude of the first peak TL but also the second peak TL.