The effect of compression ratio on the CNG-diesel engine

Lim, Pei Li (2004) The effect of compression ratio on the CNG-diesel engine. [USQ Project] (Unpublished)

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Abstract

The objective of this study is to investigate the effects of different compression ratio on the performance of a diesel engine operating on a dual fuel system using Compressed Natural Gas (CNG) as the main fuel. The original diesel engine is a fourstroke, Ford diesel engine with a compression ratio of 22.9:1. In order to accommodate CNG in diesel engine, the compression ratio has to be reduced to prevent knock. Therefore, Computational Fluid Dynamics (CFD) method using FLUENT simulation software is used for this purpose. The engine performance will be investigated in terms of the mixing quality of CNG and air before injection of diesel fuel, temperature and pressure distribution, and stream function of the mixture during the compression stroke. Based on the simulation results, the optimum compression ratio chosen to operate the CNG-diesel engine without knock is 16.6:1. At this compression ratio, the engine can operate until the normal operating load condition where the wall temperature is 373 K before the engine was knocking.


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Item Type: USQ Project
Refereed: No
Item Status: Live Archive
Depositing User: epEditor USQ
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Mechanical and Mechatronic Engineering
Date Deposited: 11 Oct 2007 00:14
Last Modified: 02 Jul 2013 22:30
Uncontrolled Keywords: diesel engine, compression ratio, compressed natural gas (CNG), computational fluid dynamics (CFD), FLUENT
Fields of Research (FOR2008): 09 Engineering > 0913 Mechanical Engineering > 091399 Mechanical Engineering not elsewhere classified
09 Engineering > 0902 Automotive Engineering > 090201 Automotive Combustion and Fuel Engineering (incl. Alternative/Renewable Fuels)
URI: http://eprints.usq.edu.au/id/eprint/72

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