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Performance and combustion characteristics of a diesel-pilot gas injection engine Gunawan, Hardi

Abstract

High pressure injection of natural gas with diesel liquid pilot fuel has been investigated in a single-cylinder two-stroke diesel engine of low compression ratio. The thermal efficiency and emissions of NOx, CO and HC were determined at 1200RPM as a function of load. Variations of the pilot-diesel energy to total heat energy ratio (in the range 15 -25%) strongly affected efficiency and emissions rate. Gas injection pressure was also shown to be an important variable. The thermal efficiency of the gas-diesel engine was shown to exceed that of the conventional diesel at full load, and is less at low load in the present configuration. The combustion rate analysis has been used to determine the pressure rise (ignition time) delay and combustion duration as well as the characteristic burning pattern. At low load late burning high cyclic variations, and incomplete combustion are associated with peak compression temperature lower than 900 K.

Item Metadata

Title	Performance and combustion characteristics of a diesel-pilot gas injection engine
Creator	Gunawan, Hardi
Publisher	University of British Columbia
Date Issued	1992
Description	High pressure injection of natural gas with diesel liquid pilot fuel has been investigated in a single-cylinder two-stroke diesel engine of low compression ratio. The thermal efficiency and emissions of NOx, CO and HC were determined at 1200RPM as a function of load. Variations of the pilot-diesel energy to total heat energy ratio (in the range 15 -25%) strongly affected efficiency and emissions rate. Gas injection pressure was also shown to be an important variable. The thermal efficiency of the gas-diesel engine was shown to exceed that of the conventional diesel at full load, and is less at low load in the present configuration. The combustion rate analysis has been used to determine the pressure rise (ignition time) delay and combustion duration as well as the characteristic burning pattern. At low load late burning high cyclic variations, and incomplete combustion are associated with peak compression temperature lower than 900 K.
Extent	5552449 bytes
Genre	Thesis/Dissertation
Type	Text
File Format	application/pdf
Language	eng
Date Available	2008-09-16
Provider	Vancouver : University of British Columbia Library
Rights	For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
DOI	10.14288/1.0080923
URI	http://hdl.handle.net/2429/2059
Degree	Master of Applied Science - MASc
Program	Mechanical Engineering
Affiliation	Applied Science, Faculty of; Mechanical Engineering, Department of
Degree Grantor	University of British Columbia
Graduation Date	1992-11
Campus	UBCV
Scholarly Level	Graduate
Aggregated Source Repository	DSpace

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For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.