Thermodynamic analysis of endoreversible six-stroke Otto cycle with respect to equivalence ratio, residual gas fraction and mean piston speed

Year 2019, Volume: 8 Issue: 1, 1 - 10, 20.05.2019

Emre Arabacı

https://doi.org/10.18245/ijaet.500789

Cited By: 2

Abstract

The analysis of the
six-stroke Otto cycle was performed using the finite-time thermodynamics
dependence on mean piston speed, equivalence ratio and residual gas fraction.
In the analysis, friction loss, internal irreversibilities, heat transfer
losses were taken into account by empirical correlations. Relations between
power output, thermal efficiency, and compression ratio were obtained by
detailed numerical examples. The results were presented as comparative for
four- and six-stroke Otto cycle. It was assumed that the cycles operate with
the same mixture flow per second so that both performances of cycles can be
compared. The study showed that more fuel flow can be supplied to the
six-stroke Otto cycle for the same mixture flow. However, there was a slight
increase in the maximum cycle temperature. For this reason, the results are
crucial in providing a good guideline for evaluating and improving the
performance of real six-stroke Otto engines.

Keywords

six stroke, endoreversible otto cycle, finite time thermodynamics, performance, efficiency

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