Development of a diesel engine muffler using a mixture of out-of-phase split exhaust streams
Because conventional mufflers for internal combustion engines are mostly constructed using a mixture or combination of perforated ducts, baffles or perforated baffles and expansion chambers, the noise reduction is limited and backpressure is high so that the fuel efficiency is low.
In this paper, a new concept for an exhaust muffler for a diesel engine based on out-of-phase cancellation is proposed. The proposed muffler uses an interior chamber with two opposing rectangular slits, by which the exhaust stream is split into two out-of-phase branches. When these two flow
branches are mixed, cancellation reduces the flow speeds. This results in the low backpressure and low air-regeneration noise in the new muffler. The principle of the new muffler has been demonstrated by the numerical simulation and experiments conducted on a single-cylinder diesel engine.
Document Type: Research Article
Publication date: 01 November 2010
NCEJ is a peer reviewed Technical journal published every two months. The papers published in NCEJ cover general topics related to noise control engineering, ranging from fundamental research to applied case studies and histories.
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