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

Flow resistance network analysis of the back-pressure of automotive mufflers
Flow resistance network analysis of the back-pressure of automotive mufflers
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.
339-349
Munjal, M.L.
ba43c325-ed0a-48b1-82c6-7efcc77834a0
Vijayasree, N.K.
f6de7794-d681-4435-8947-730204ab8d67
Paruchuri, Chaitanya
5c1def64-6347-4be3-ac2d-b9f6a314b81d
Munjal, M.L.
ba43c325-ed0a-48b1-82c6-7efcc77834a0
Vijayasree, N.K.
f6de7794-d681-4435-8947-730204ab8d67
Paruchuri, Chaitanya
5c1def64-6347-4be3-ac2d-b9f6a314b81d

Munjal, M.L., Vijayasree, N.K. and Paruchuri, Chaitanya (2013) Flow resistance network analysis of the back-pressure of automotive mufflers. Indian Journal of Engineering and Materials Sciences, 20 (5), 339-349.

Record type: Article

Abstract

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.

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IJEMS 20(5) 339-349-2 - Version of Record
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Published date: October 2013

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Local EPrints ID: 435591
URI: http://eprints.soton.ac.uk/id/eprint/435591
PURE UUID: 566ddaa8-d015-48c8-86d8-3c27bf55dfd7

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Date deposited: 12 Nov 2019 17:30
Last modified: 12 Nov 2019 17:30

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