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Flow resistance network analysis of the back-pressure of automotive mufflers

Munjal, ML and Vijayasree, NK and Chaitanya, P (2013) Flow resistance network analysis of the back-pressure of automotive mufflers. In: INDIAN JOURNAL OF ENGINEERING AND MATERIALS SCIENCES, 20 (5). pp. 339-349.

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Official URL: http://dx.doi.org/10.1016/j.tecto.2013.07.034


Complexity of mufflers generally introduces considerable pressure drop, which affects the engine performance adversely. Not much literature is available for pressure drop across perforates. In this paper, the stagnation pressure drop across perforated muffler elements has been measured experimentally and generalized expressions have been developed for the pressure loss across cross-flow expansion and cross-flow contraction elements. A flow resistance model available in the literature has been made use of to analytically determine the flow distribution and thereby the pressure drop of mufflers. A generalized expression has been derived here for evaluation of the equivalent flow resistance for parallel flow paths. Expressions for flow resistance across perforated elements, derived by means of flow experiments, have been implemented in the flow resistance network. The results have been validated with experimental data. Thus, the newly developed integrated flow resistance networks would enable us to determine the normalized stagnation pressure drop of commercial automotive mufflers, thus enabling an efficient flow-acoustic design of silencing systems.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to the NATL INST SCIENCE COMMUNICATION-NISCAIR, INDIA
Keywords: Muffler; Flow resistance network; Back pressure
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Depositing User: Id for Latest eprints
Date Deposited: 17 Feb 2014 11:02
Last Modified: 18 Feb 2014 07:38
URI: http://eprints.iisc.ac.in/id/eprint/48390

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