Performance and emission investigation of a four-stroke liquefied petroleum gas spark-ignition engine generator used in a Malaysian night market

Yusaf, Talal and Said, Mior Azman and Hussein, Ibrahim (2010) Performance and emission investigation of a four-stroke liquefied petroleum gas spark-ignition engine generator used in a Malaysian night market. Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, 224 (3). pp. 339-347. ISSN 0957-6509


The objective of this study is to investigate and compare the performance and emission characteristics of the liquefied petroleum gas (LPG)-fuelled engine generator and the conventional gasoline-fuelled engine generator. The approach involves converting a gasoline engine
generator, commonly used in Malaysian night markets to generate electricity, to the LPG engine generator. A four-stroke SI single-cylinder engine is equipped with an LPG injection system with minor modifications and then tested with both LPG and gasoline fuels. A venturi mixer (carburettor) was designed and in house constructed and then installed to deliver a proper A/F ratio to
the combustion chamber. The commercial computational fluid dynamics software FLUENT was used for simulation of air flow inside the mixer.
The converted engine was tested at constant speed for its brake-specific fuel consumption
(BSFC), efficiency, exhaust temperature, and exhaust gas emissions. The results show that the
performance and emission characteristics of the LPG-fuelled engine are well suited for use in
night markets. Average BSFC and average efficiency for the LPG engine over a range of loads were
quite similar to those for the gasoline engine: the average BSFC was 0.95 kg/kWh for the LPG
engine and 1 kg/kWh for the gasoline engine.
The lower energy content of LPG causes only a slight reduction in efficiency as 17 per cent
reduction in average efficiency was recorded over the entire load range; however, the LPG engine
fared better at higher loads than the gasoline engine for which only as low as 4 per cent reduction
was recorded at high loads.Emission testsseemto verify the minimal pollution products; there are
significant reductions in the emission concentration results when LPG is used. Average decreases
of 32 per cent for nitrogen oxide, 10 per cent for carbon dioxide, and 40 per cent for carbon monoxide were recorded. However, higher values of hydrocarbon were recorded, but as high as 50 per cent reduction in HC was found for loads higher than 700W. The study verified the more favourable features ofLPGcompared to gasoline as it is one of the best alternative fuels to gasoline for spark-ignition engine generators to solve the air pollution problem in night markets.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to paper due to publisher copyright policy.
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Mechanical and Mechatronic Engineering
Date Deposited: 24 May 2010 03:32
Last Modified: 02 Jul 2013 23:35
Uncontrolled Keywords: emission; LPG; night market; Malaysia; liquefied petroleum gas; gasoline; spark-ignition engine
Fields of Research : 09 Engineering > 0902 Automotive Engineering > 090205 Hybrid Vehicles and Powertrains
09 Engineering > 0902 Automotive Engineering > 090202 Automotive Engineering Materials
09 Engineering > 0902 Automotive Engineering > 090201 Automotive Combustion and Fuel Engineering (incl. Alternative/Renewable Fuels)
Socio-Economic Objective: B Economic Development > 88 Transport > 8898 Environmentally Sustainable Transport > 889899 Environmentally Sustainable Transport not elsewhere classified
Identification Number or DOI: 10.1243/09576509JPE882

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