VENTURI TUBES - ACOUSTIC ATTENUATION WITH FLOW LOSS CONSIDERATIONS

The acoustic wave attenuation performance of Venturi tubes with zero m ean fluid flow is investigated by: (1) combining analytical solutions for one-dimensional wave propagation in conical reducers, diffusers, a nd straight ducts; (2) employing a computational time-domain technique ; and (3) conducting experiments in an extended impedance tube setup w ith four fabricated Venturi tubes and matching contraction chambers. T he results from both analytical and computational approaches compare w ell with each other and the experimental data. The numerical technique is also applied to address the effects of a compressible mean flow on the acoustic behavior. Finally, the flow performance of the fabricate d Venturi tubes is measured and the trade-offs are discussed between f low efficiency and acoustic performance.