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UBC Theses and Dissertations
Performance, emissions and combustion characteristics of natural gas fueling of diesel engines Douville, Brad
Abstract
The performance, emissions and combustion characteristics of natural gas fueling of diesel engines have been investigated. The natural gas fueling system employs electronically-controlled late-cycle direct injection of high pressure natural gas with a small amount of diesel fuel (diesel pilot). Since the temperature in the combustion chamber at the end of compression is below the autoignition temperature of natural gas, the diesel pilot is required for ignition. Diesel engine performance and emissions have been measured using both natural-gas and conventional diesel fueling, over a wide range of operating conditions. The combustion process in diesel engines has been modeled based on measured cylinder pressure to learn about the formation rates of oxides of nitrogen and fuel burning rates. This combustion model has been developed to deal specifically with the non-uniformities and pollutant formation associated with stratified-charge combustion in diesel engines. The test results demonstrate that the thermal efficiencies for both natural gas and conventional diesel fueling at low and medium engine loads, are almost identical. The thermal efficiencies at high loads for natural gas fueling are greater than for conventional diesel fueling. Upon optimization of the natural gas and diesel pilot injection, lower pollutant exhaust emissions will be produced over the entire engine load range, while obtaining higher peak engine load capabilities than with conventional diesel fueling.
Item Metadata
Title |
Performance, emissions and combustion characteristics of natural gas fueling of diesel engines
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1994
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Description |
The performance, emissions and combustion characteristics of natural gas fueling of diesel
engines have been investigated. The natural gas fueling system employs electronically-controlled
late-cycle direct injection of high pressure natural gas with a small amount of diesel fuel (diesel
pilot). Since the temperature in the combustion chamber at the end of compression is below the
autoignition temperature of natural gas, the diesel pilot is required for ignition. Diesel engine
performance and emissions have been measured using both natural-gas and conventional diesel
fueling, over a wide range of operating conditions. The combustion process in diesel engines has
been modeled based on measured cylinder pressure to learn about the formation rates of oxides of
nitrogen and fuel burning rates. This combustion model has been developed to deal specifically
with the non-uniformities and pollutant formation associated with stratified-charge combustion in
diesel engines. The test results demonstrate that the thermal efficiencies for both natural gas and
conventional diesel fueling at low and medium engine loads, are almost identical. The thermal
efficiencies at high loads for natural gas fueling are greater than for conventional diesel fueling.
Upon optimization of the natural gas and diesel pilot injection, lower pollutant exhaust emissions
will be produced over the entire engine load range, while obtaining higher peak engine load
capabilities than with conventional diesel fueling.
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Extent |
3440653 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-02-26
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Provider |
Vancouver : University of British Columbia Library
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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.
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DOI |
10.14288/1.0080855
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
1994-05
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
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.