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On the crucial role of mean flow in the design of multiply-connected coaxial perforated element mufflers

Kumar, KM and Munjal, ML (2017) On the crucial role of mean flow in the design of multiply-connected coaxial perforated element mufflers. In: NOISE CONTROL ENGINEERING JOURNAL, 65 (5). pp. 462-481.

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Official URL: http://dx.doi.org/10.3397/1/3762

Abstract

Efficient muffler design for automotive engine requires adequate overall insertion loss (IL) in dB(A), lower backpressure to ensure low brake specific fuel consumption (BSFC) of the engine, and a low muffler volume to engine capacity ratio. In this study, the role of mean flow on the flow-acoustic performance of four different multiply-connected co-axial mufflers (MCCA) is illustrated. The parametric studies on one of the configurations highlight the importance of the bias and grazing mean flow Mach number. The automotive engines operate over a wide range of engine speeds, which demands a wideband transmission loss (TL) and insertion loss rather than sharp peaks at certain frequencies. In the literature, a higher mean flow Mach number has been associated with more flow-noise as well as backpressure. However, in this study, it is shown that higher mean flow can be used to advantage in the MCCA mufflers by making use of the in line flow-acoustic resistance which raises the TL curve over the entire frequency range. This article presents some design guidelines for the mufflers with higher specific insertion loss (ratio of overall insertion loss (in dB(A)) to the muffler to engine volume ratio) as well as a modest backpressure. (C) 2017 Institute of Noise Control Engineering.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the INST NOISE CONTROL ENGINEERING, IOWA STATE UNIV, COLLEGE ENGINEERING, 212 MARSTON HALL, AMES, IA 50011-2152 USA
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Depositing User: Id for Latest eprints
Date Deposited: 02 Mar 2018 15:06
Last Modified: 02 Mar 2018 15:06
URI: http://eprints.iisc.ac.in/id/eprint/58896

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