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On development of rational design guidelines for large side-inlet side-outlet perforated element mufflers

Kumar, K M and Munjal, M L (2018) On development of rational design guidelines for large side-inlet side-outlet perforated element mufflers. In: NOISE CONTROL ENGINEERING JOURNAL, 66 (4). pp. 308-323.

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Official URL: http://dx.doi.org/10.3397/1/376627


Logistics of an acoustic enclosure for a diesel generator (DG) set require mounting of the exhaust muffler on the top of the enclosure with side inlet and side outlet. In this article, four different, yet somewhat similar, side-inlet side-outlet (SISO) perforated element muffler configurations have been investigated. It has been shown that the 1-D plane wave analysis is adequate for the first few harmonics of the engine speed order that are of prime interest for muffler designers. This simplified analysis throws light on the significant role of the resistive part of the perforate impedance and thence the bias flow Mach number. In particular, the effect of bias flow in raising the troughs is suitably exploited while limiting the overall backpressure of the muffler. The 1-D plane wave analysis, however, becomes too approximate at higher frequencies, and for that reason, one has to rely on the 3-D FEA for evaluation of the overall four-pole parameters of the muffler. A convergence study has been performed on one of the four configurations in order to arrive at an average mesh size that can capture the transmission loss (TL) values correctly up to 1000 Hz, and thereby economize on the RAM as well as the computational time for analysis of all four configurations. The backpressure for all the four muffler configurations is kept approximately the same. Finally, some design guidelines for similar mufflers are discussed. (c) 2018 Institute of Noise Control Engineering.

Item Type: Journal Article
Additional Information: Copy right for this article belong to 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
Date Deposited: 27 Sep 2018 14:48
Last Modified: 27 Sep 2018 14:48
URI: http://eprints.iisc.ac.in/id/eprint/60760

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