Abstract
The liquefied petroleum gas has a great potential to improve energetically and pollution performance of compression ignition engines due to its good combustion properties. This paper presents results of the researches carried on a car compression ignition engine with a 1.5 dm 3 displacement, fuelled with diesel fuel and liquefied petroleum gas by diesel-gas method at the operating regimens of 70% and 55% engine load, engine speed of 2000 rpm and for substitute ratios between (6–19)%. A specific objective of this paper is to establish a correlation between the optimum adjustments and the substitute ratio of the diesel fuel with liquefied petroleum gas for the investigated regimens to limit the maximum pressure and smoke level, knock and rough engine functioning and having regard to decrease the fuel consumption and the level of the pollutant emissions.
Highlights
In the last years, the internal combustion engines and especially compression ignition engines increased the energetic performances either because of the researcher’s continuous work or because of the need of fossil fuels saving, whose resources are exhaustible
The substitute ratio of diesel fuel with liquefied petroleum gas (LPG) was limited in both cases (70% engine load and 55% engine load) to limit the maximum pressure and smoke level, knock and rough engine functioning
The combustion noise, evaluate by the maximum rate of pressure rise decreased for all the investigated substitute ratios of diesel fuel with LPG either for 70% engine load or 55% engine load because the diesel fuel injection timing advance was reduced in order to limit the nitrogen oxides emissions level
Summary
The internal combustion engines and especially compression ignition engines increased the energetic performances either because of the researcher’s continuous work or because of the need of fossil fuels saving, whose resources are exhaustible. The smoke and the smell of exhaust gases imposed reticence of many users to use vehicles equipped with compression-ignition engines. This behavior of the compression-ignition engine has been greatly improved by solutions adopted to limit the environmental pollution and by the adoption of legislative rules. One of the recommended solutions to reduce emissions from compression ignition engine is the use of alternative fuels. Of these, liquefied petroleum gas (LPG) is a clean and efficient alternative fuel, its use being possible without major structural changes of the engine. Density Vaporization heat Self ignition temperature Inflammability limits A/F ratio Flame temperature Lower heating value Lower heating value Cetane number CC [kg/m3] [kJ/kg]. In this paper the authors chose to fuel the engine by Diesel-Gas method
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