Modelo Termodinámico ideal para estimar las curvas características de un motor de combustión interna de encendido por compresión.

Abstract

This paper presents a simple thermodynamic model together with a user interface to model the characteristic curves of a reciprocating internal combustion engine. The model presented is based on considerations of a standard air cycle, however, it includes elements that allow a very accurate estimation of the engine performance, such as the calculation of the residual fraction, the temperature and pressure at the beginning of compression and combustion at constant volume and pressure, and the percentage of fuel. The results obtained with the model are validated with experimental results and are presented through a user interface that allows changing the engine geometry (number of cylinders, piston diameter, stroke, compression ratio and air/fuel ratio), physical variables (ambient temperature and atmospheric pressure) and the lower calorific value of the fuel. This model was compared with other models with similar characteristics, showing little deviation.