End corrections for double-tuning of the same-end inlet-outlet muffler

Gaonkar, C D and Rao, D R and Kumar, K M and Munjal, M L (2020) End corrections for double-tuning of the same-end inlet-outlet muffler. In: APPLIED ACOUSTICS, 159 .

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Abstract

Transmission loss spectrum of a simple expansion chamber (SEC) muffler is characterized by periodic domes. In recent years, it has been shown that by extending the inlet pipe and outlet pipe of the SEC inwards by nearly half and quarter lengths (L/2 and L/4) into the chamber, it is possible to raise three-fourths of all the IL-troughs, thereby ensuring a wide-band TL spectrum. This has been called Double-Tuning of the SEC. In practice, physical lengths of the extended inlet and extended outlet are made shorter than L/2 and L/4 by end correction in order to account for the higher-order evanescent modes at the two junctions. In this paper, making use of the three-dimensional (3-D) finite element method (FEM), general parametric expressions have been developed for the end corrections of the two junctions of the same-end inlet-outlet (SEIO) chamber, or flow-reversal chamber, in order to double-tune it on the lines of the co-axial opposite-ends inlet-outlet chamber muffler. The 3-D finite element mesh convergence has been validated against the available experimental TL spectra. This study is perhaps the first known attempt at double-tuning of the same-end inlet-outlet (SEIO) chamber muffler.

Item Type:	Journal Article
Publication:	APPLIED ACOUSTICS
Publisher:	ELSEVIER SCI LTD
Additional Information:	Copyright of this article belongs to ELSEVIER SCI LTD
Keywords:	Double-tuning; Same-end inlet-outlet chamber muffler; End correction; Higher-order evanescent modes
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	02 Jan 2020 10:36
Last Modified:	02 Jan 2020 10:36
URI:	http://eprints.iisc.ac.in/id/eprint/64277

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