Abstract
The paper presents comparison of a selected combustion parameters of dual fuel, spark ignited engine run on gasoline and methyl alcohol. To the testing was used a four cylinder Fiat 1100 MPI engine with multipoint injection of gasoline and alcohol to area of inlet valve. Preliminary tests of the engine pointed at significant differences of its performance when the engine was run on alcohol only and on gasoline only [1]. In connection with it an indicator tests were performed in order to determine, on their base, a differences present in runs of combustions of the both fuels. The paper presents comparison of maximal pressure, rate of pressure rise, average temperature of working medium, heat release rate, total angle of combustion and indicated efficiency. These parameters were analyzed both in function of crankshaft rotation angle as well as engine load. Obtained results show at different course of methanol combustion comparing to gasoline. Run of methanol combustion is more rapid, what leads to growth of engine efficiency and increase of maximal cylinder pressures. Growth of working medium temperatures during combustion, what can lead to growth of thermal load of the engine, can be included to disadvantageous phenomena. Performed tests point at necessity of engine tuning modification during feeding with methanol, what would enable to take full benefits of advantageous properties of that fuel. Simultaneously, optimization tests have enabled to restrict disadvantageous effects of combustion of methanol.
Highlights
The nineties of 20th century and beginning of the 21st century denote the years when tendency to intensive exploration of alternative fuels for motorization can be observed
Numerous development work published recently show at renewed interest in alcohols, which belong to the fuels having significant quantities of oxygen in their chemical constitution
Elimination of alcohol’s drawback connected with stratification of its mixtures with gasoline or diesel oil, technological progress connected with engine feeding and control systems which occurred recently, advantages connected with significantly lower toxicity of exhaust gases, higher octane number and possibility of improvement of engine parameters cause that the alcohols become objects of interest for much bigger scale than in the past
Summary
The nineties of 20th century and beginning of the 21st century denote the years when tendency to intensive exploration of alternative fuels for motorization can be observed. Elimination of alcohol’s drawback connected with stratification of its mixtures with gasoline or diesel oil, technological progress connected with engine feeding and control systems which occurred recently, advantages connected with significantly lower toxicity of exhaust gases, higher octane number and possibility of improvement of engine parameters cause that the alcohols (methanol and ethanol) become objects of interest for much bigger scale than in the past It can be proved by numerous papers published in the recent years because test results presented in these papers are promising [13, 15,16,17,18,19,20, 22, 23, 25,26,27]. It should be underlined that such trend of fuelling is investigated by Volvo and Ford, what can be proved by information found in the literature [11]
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