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Publications

Impedance correction for a branched duct in a thermoacoustic air-conditioner

Carl Q. Howard (2006)

Proceedings of Acoustics 2006: Noise of Progress, Clearwater Resort, Christchurch, New Zealand, 20-22 November, p429-433

Abstract:

A thermoacoustic air conditioner that utilises a branched duct network is described in this paper. It was found that the standard four-pole methods to describe the acoustics in the branched duct did not match the predictions from finite element analyses. Additional correction terms to describe lumped inertances at the branch connection are required to properly describe the acoustic behaviour of the system. Branched ducts of square, rectangular, triangular, and semi-circular shapes are considered, and the corresponding terms for the lumped impedances are given.

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