Abstract
In the paper are presented results of a research work concerning automotive spark ignition engine fueled with ethyl alcohol. The research was performed on a Fiat 1100 MPI engine adapted to dual fuel feeding. Injection of ethyl alcohol was accomplished in area near inlet valve with use of original injectors, the same as used in case of gasoline feeding. The subject-matter of the study was to compare smoothness of engine operation fueled with alcohol in relation to parameters of the engine fueled traditionally with gasoline. There were analyzed combustion parameters calculated on the basis of recorded indicated diagrams of successive individual combustion cycles and averaged diagrams of successive 50 cycles. Performed investigations are pointing at smooth engine operation running on neat alcohol, and on improvement of performance parameters such as effective power and overall efficiency.
Highlights
Obligation of usage of biofuels results from accomplishment of the National Indicative Targets (NCW in short), which assume gradual increase of reproducible fuels in total volume of engine fuels [1,2,3]
Analysis of relative factor of variability of the pi shown in Fig. 9 tells that in range of medium and maximal engine loads the fluctuations of pi for the both fuels are similar and their values are lower than 2%, what should be considered as a small changes, comparing with the ones met in a spark ignition engines
Increase of the efficiency occurs in complete range of changes of engine load and rotational speed and amounts to 1.5–2.5% of absolute values
Summary
Obligation of usage of biofuels results from accomplishment of the National Indicative Targets (NCW in short), which assume gradual increase of reproducible fuels in total volume of engine fuels [1,2,3]. Anyhow, taking into consideration differences in calorific values, obtainment of the same unit of energy from alcohols will result in a slight, within limits 2%, reduction of CO2 emissions comparing with gasoline [14,15,16] Alcohols, due to their perfect properties, mainly due to high octane number, high heat of vaporization and high combustion rate, can be successfully used both in spark ignition engines (as a neat fuels, or as additions to traditional fuels), and in self-ignition engines as additions combusted simultaneously with diesel oil [10, 11, 17, 19]. View of the test stand is presented in the Fig. 2
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