Resonance Frequency Charasteristics of Helmeholtz Type Silencers

Abstract

The effects of geometric parameters and flow on the resonance flequency characteristics of Helmeholtz resonator type silencers have been investigated. It is shown that the end correction of a resonator is varied by the dimensionless frequency, the parameters on the shape of connector open-ends and connector itself, and the flow velocity. Consequently, the resonance frequency is shifted owing to the change of the effective length of a connector. In this case, the resonance energy at a silencer entrance is affected by the ratio of connector diameter to duct width as well as the flow velocity.