Oxygenated palm biodiesel: Ignition, combustion and emissions quantification in a light-duty diesel engine
This paper presents an investigation of oxygenated neat palm biodiesel in a direct injection single cylinder diesel engine in terms of ignition, combustion and emissions characteristics. Conventional non-oxygenated diesel fuel is compared as baseline. The engine testing is performed between the oper...
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my.utm.587472021-12-14T08:50:45Z http://eprints.utm.my/id/eprint/58747/ Oxygenated palm biodiesel: Ignition, combustion and emissions quantification in a light-duty diesel engine Chong, Cheng Tung Ng, Jo Han Ahmad, Solehin Rajoo, Srithar TJ Mechanical engineering and machinery This paper presents an investigation of oxygenated neat palm biodiesel in a direct injection single cylinder diesel engine in terms of ignition, combustion and emissions characteristics. Conventional non-oxygenated diesel fuel is compared as baseline. The engine testing is performed between the operating speed of 2000-3000 rpm and load of up to 3 bar of brake mean effective pressure. From it, a total of 50 experiment cases are tested to form a comprehensive operational speed-load contour map for ignition and combustion; while various engine-out emissions such as NO, CO, UHCs and CO2 are compared based on fuel type-speed combinations. The ignition and combustion evolution contour maps quantify the absolute ignition delay period and elucidate the difference between that of palm biodiesel and fossil diesel. Although diesel has shorter ignition delay period by up to 0.6 CAD at 3000 rpm and burns more rapidly at the start of combustion, combustion of palm biodiesel accelerates during the mid-combustion phase and overtakes diesel in the cumulative heat release rates (HRR) prior to the 90% cumulative HRR. This can be attributed to the oxygen contained in palm biodiesel assisting in localized regions of combustion. In terms of performance, the oxygenated nature of palm biodiesel provided mixed performances with improved thermal efficiency and increased brake specific fuel consumption, due to the improved combustion and lower calorific values, respectively. Emission measurements show that NO for palm biodiesel is lower compared to diesel at low and mid operating speed by up to 36.8%, which can be attributed to the lower combustion temperature. Other emissions such as CO, UHCs and CO2 showed similar emissions output for the two fuels. The prevailing trends from this study is also compared against trends from other similar studies to form a definitive trend guide for the performance and emissions parameters of interest for light-duty diesel engines when fuelled with biodiesel. Elsevier Ltd. 2015 Article PeerReviewed Chong, Cheng Tung and Ng, Jo Han and Ahmad, Solehin and Rajoo, Srithar (2015) Oxygenated palm biodiesel: Ignition, combustion and emissions quantification in a light-duty diesel engine. Energy Conversion And Magement, 101 . pp. 317-325. ISSN 0196-8904 http://dx.doi.org/10.1016/j.enconman.2015.05.058 DOI:10.1016/j.enconman.2015.05.058 |
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TJ Mechanical engineering and machinery Chong, Cheng Tung Ng, Jo Han Ahmad, Solehin Rajoo, Srithar Oxygenated palm biodiesel: Ignition, combustion and emissions quantification in a light-duty diesel engine |
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This paper presents an investigation of oxygenated neat palm biodiesel in a direct injection single cylinder diesel engine in terms of ignition, combustion and emissions characteristics. Conventional non-oxygenated diesel fuel is compared as baseline. The engine testing is performed between the operating speed of 2000-3000 rpm and load of up to 3 bar of brake mean effective pressure. From it, a total of 50 experiment cases are tested to form a comprehensive operational speed-load contour map for ignition and combustion; while various engine-out emissions such as NO, CO, UHCs and CO2 are compared based on fuel type-speed combinations. The ignition and combustion evolution contour maps quantify the absolute ignition delay period and elucidate the difference between that of palm biodiesel and fossil diesel. Although diesel has shorter ignition delay period by up to 0.6 CAD at 3000 rpm and burns more rapidly at the start of combustion, combustion of palm biodiesel accelerates during the mid-combustion phase and overtakes diesel in the cumulative heat release rates (HRR) prior to the 90% cumulative HRR. This can be attributed to the oxygen contained in palm biodiesel assisting in localized regions of combustion. In terms of performance, the oxygenated nature of palm biodiesel provided mixed performances with improved thermal efficiency and increased brake specific fuel consumption, due to the improved combustion and lower calorific values, respectively. Emission measurements show that NO for palm biodiesel is lower compared to diesel at low and mid operating speed by up to 36.8%, which can be attributed to the lower combustion temperature. Other emissions such as CO, UHCs and CO2 showed similar emissions output for the two fuels. The prevailing trends from this study is also compared against trends from other similar studies to form a definitive trend guide for the performance and emissions parameters of interest for light-duty diesel engines when fuelled with biodiesel. |
format |
Article |
author |
Chong, Cheng Tung Ng, Jo Han Ahmad, Solehin Rajoo, Srithar |
author_facet |
Chong, Cheng Tung Ng, Jo Han Ahmad, Solehin Rajoo, Srithar |
author_sort |
Chong, Cheng Tung |
title |
Oxygenated palm biodiesel: Ignition, combustion and emissions quantification in a light-duty diesel engine |
title_short |
Oxygenated palm biodiesel: Ignition, combustion and emissions quantification in a light-duty diesel engine |
title_full |
Oxygenated palm biodiesel: Ignition, combustion and emissions quantification in a light-duty diesel engine |
title_fullStr |
Oxygenated palm biodiesel: Ignition, combustion and emissions quantification in a light-duty diesel engine |
title_full_unstemmed |
Oxygenated palm biodiesel: Ignition, combustion and emissions quantification in a light-duty diesel engine |
title_sort |
oxygenated palm biodiesel: ignition, combustion and emissions quantification in a light-duty diesel engine |
publisher |
Elsevier Ltd. |
publishDate |
2015 |
url |
http://eprints.utm.my/id/eprint/58747/ http://dx.doi.org/10.1016/j.enconman.2015.05.058 |
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1720436888172494848 |