A simplified irreversible Otto engine model with fluctuations in the combustion heat

Abstract

SYNOPSISIn this work we present a simplified irreversible Otto engine model which includes power losses and a chemical combustion reaction at the end of the adiabatic compression. The heat released in the combustion reaction is taken as a fluctuant quantity around its mean value. The fluctuations are simulated by means of a Gaussian stochastic process for a rich-air intake mixture and by two non-linear deterministic noisy maps in the case of poor-air mixtures. The fluctuant combustion heat drives the Otto engine model producing in turn fluctuant power output and fluctuant cycle efficiency. We analyse the size of the fluctuant outputs in terms of the fluctuant input.

Progress in Finite Time Thermodynamic Studies for Internal Combustion Engine Cycles

“…In [86,87], the authors only considered the SH of WF varied with the component and did not consider the SH varied with temperature. Furthermore, only the SH empirical equations were substituted into the final power output and efficiency performance characteristics equations, and the influence of VSH on the adiabatic process equation was not considered.…”

“…The Optimum Performance with VSH of WF Rocha-Martinez et al [86,87] investigated the influence of cyclic variability (VSH of WF) on the power output and efficiency performance characteristics of the Otto cycle. In [86,87], the authors only considered the SH of WF varied with the component and did not consider the SH varied with temperature.…”

“…Refs. [86,87] first advanced the variable specific heat (VSH) model in which the SH was assumed to change with the WF component. This model was relatively simple and didn't consider the influences of VSH on cycle process.…”

Modelling of a Spark Ignition Engine for Power-Heat Production Optimization

“…The heat loss by thermo convective and radiative heat exchanges results as: (12) where T w is the wall temperature supposed constant.…”

“…Finally, Angulo-Brown et al [11] and Rocha-Martinez et al [12] take account of the combustion reaction and consequences. But there are thermal losses as noted by Chen et al [13].…”