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Green fuels for small combustion engines
Záhorský, Lukáš ; Klimeš, Lubomír (oponent) ; Štětina, Josef (vedoucí práce)
This study confronts the availability and function of various alternative fuels for small two-stroke spark-ignition combustion engines used in sports equipment. Because of rising GHG emissions and the increase in Earth´s surface temperature, alternative sustainable fuels seem indispensable to improve the environment. In the study, available alternative fuels are selected based on their properties and ecology. Firstly, these fuels are experimentally tested on the engine test bench, and individual engine properties are compared. Secondly, a simulation of the heat cycle of the engine is conducted to confirm the results achieved from the experiment. Out of all tested fuels, eco-friendly ethanol seems like the best-performing fuel. However, although it is not fully sustainable, another alternative fuel – E40 mixture – with lower BSFC and slightly lower performance should also be considered. All alternative alcohol-based fuels generally reached lower GHG emissions in both analyses. Based on the results, using alternative fuels in small two-stroke combustion engines can improve their performance and ecology only with small modifications. Nevertheless, more research needs to be done on sustainable alternative fuels to start large-scale serial production and reduce transport´s carbon footprint.
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