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A computational study of free-piston diesel engine combustion

Lookup NU author(s): Dr Rikard Mikalsen, Professor Tony Roskilly

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Abstract

This paper investigates the in-cylinder gas motion, combustion process and nitrogen oxide formation in a free-piston diesel engine and compares the results to those of a conventional engine, using a computational fluid dynamics engine model. Enhanced radial gas flow (squish and reverse squish) around top dead centre is found for the free-piston engine compared to a conventional engine, however it is found that this has only minor influence on the combustion process. A higher heat release rate from the pre-mixed combustion phase due to an increased ignition delay was found, along with potential reductions in nitrogen oxides emissions formation for the free-piston engine. (C) 2008 Elsevier Ltd. All rights reserved.

Publication metadata

Author(s): Mikalsen R, Roskilly AP

Publication type: Article

Publication status: Published

Journal: Applied Energy

Year: 2009

Volume: 86

Issue: 7-8

Pages: 1136-1143

ISSN (print): 0306-2619

ISSN (electronic): 1872-9118

Publisher: Pergamon

URL: http://dx.doi.org/10.1016/j.apenergy.2008.08.004

DOI: 10.1016/j.apenergy.2008.08.004

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