Abstract
The paper discusses the issues of the influence of the fuel spray formation on the generation of self-ignition spots and the development of pre-flame processes in the cylinder of a model diesel engine. The investigations were carried out with the use of 8-hole piezoelectric injectors for a standard diesel fuel and three other types of fuel that were mixtures of: ethanol, butanol and gasoline in a variety of proportions. By applying optical methods of analysis the authors determined the geometrical indexes of the forming of fuel spray and of fuel mass distribution in the longitudinal and transverse cross-section of the fuel spray during the injection process. The location and number of the self-ignition spots in the combustion chamber were evaluated on the basis of a comparison under the swirl vs. no swirl conditions.
Highlights
The need to comply with exhaust emission standards will force to search for alternative fuels to power the compression ignition engines
The research reported here show the applicabil-ity of alternative fuels in combustion systems of compression ignition (CI) engines. These fuels are characterized by various physical and chemical properties, which leads to different conditions of fuel atomization and combustion
Znacznie większa ilość etanolu (45%) powoduje, że uzyskuje się zmniejszenie opóźnienia samozapłonu
Summary
The need to comply with exhaust emission standards will force to search for alternative fuels to power the compression ignition engines. Analysis of literature concerning application of modern alternative fuels shows some significant aspects of this problem: a)application of ethanol as additive to diesel fuel in the rate of 10-15% implicates lowering of PM emission by 20-27% and 30-41% respectively [1] Such mixture has lower density, lower cetane number and smaller viscosity [2, 3]. Analiza literatury dotycząca stosowania najnowszych paliw alternatywnych wskazuje na następujące aspekty: a) zastosowanie etanolu jako dodatku do oleju napędowego w ilości 10-15% powoduje zmniejszenie emisji PM odpowiednio o 20-27% i 30-41% [1]. C) application of the dietylether (DDE) as an additive to diesel fuel allows for decreasing of self-ignition delay due to the high cetane number of DDE. Research on pre-flame processes were designed to determine the ability to self-ignition based on local values of indexes of the combustion process
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