Study on performance of compression engine operated by biodiesel fuel
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Kuupäev
2020
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Abstrakt
The analysis of the performance of biofuel is aimed at evaluating the energy efficiency
of operating the engine with the use of biodiesel fuel as function of the fuel’s composition and
other physical-and-chemical parameters. The mathematical models and analysis techniques
known to the authors do not take into account the effect that the use of different bio-diesel fuels
has on the operation of the engine and, therefore, need refinement in terms of the mathematical
expressions and empirical formulae that describe the physical processes taking place in the
engine’s cylinders. The aim of the study is to improve the mathematical relations taking into
consideration the physical-and-chemical parameters of different types of fuel. The research
methods proposed in the article are based on step-by-step consideration of the mathematical
models of processes that follow each other, with due account for their possible overlapping, which
jointly have an effect on the engine’s output indices. The boundary conditions and parameter
increments are pre-set in electronic work sheets. Thus, it becomes possible, using the refined
mathematical model, to calculate the main performance indices of the diesel engine with due
account for the changes in the physical-and-chemical parameters of the fuel. The novelty of the
described approach is in the possibility, through the use of the refined model and taking into
account the data on the composition of the fuel and the design and operation parameters of the
engine, to calculate the indices that allow evaluating the efficiency of use of specific fuels in the
internal combustion engine under consideration. In results, formulas for the calculation of the
effective power of the engine, fresh air charge density, excess air factor, effective specific fuel
consumption and combustion pressure have been developed. Combustion pressure modelling and
experimental data is presented.
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Märksõnad
biofuel, efficiency, composition, physical-and-chemical parameters of the fuel, internal combustion engine, articles