Modeling of Thermodynamic Properties of Diesel Fuel and In-Cylinder Gas for Diesel Engine Combustion Investigation

Abstract

The study of the thermodynamic properties of engine fuels and the in-cylinder gas is involved in the analysis of chemical compound reaction and the thermodynamic analysis of fuel and gas, which is quite important in engine combustion investigations because the fuel chemical energy converts into internal work energy during this stage. Although the research on the thermodynamic properties of fuel and in-cylinder gas has lasted a few decades, with the development of new fuel types, developing general models with sufficient accuracy to calculate the fuel and in-cylinder gas thermodynamic properties for engines remains a challenge. This paper presents a model to calculate the diesel fuel and in-cylinder gas thermodynamic properties based on the mixture composition theory and considering the diesel fuel and in-cylinder gas mixtures in terms of the chemical reaction fundamentals. The diesel fuel and in-cylinder gas thermodynamic property modeling approach for the combustion investigation is then applied in the heat-release calculation model of a marine diesel engine, which is validated by experimental research on heat release. According to the simulation and experimental results, when considering that the diesel fuel and in-cylinder gas thermodynamic properties are affected by the in-cylinder temperature, fuel type, and air excess ratio, the engine combustion simulation results in predictions that are more accurate than those when setting the values constant. This paper provides a general approach for the investigation and application of engine fuels and in-cylinder gas thermodynamic properties, in particular for new fuel substitution in engines.

Critical Review on Effects of Alcohols and Nanoadditives on Performance and Emission in Low-Temperature Combustion Engines: Advances and Perspectives

“…As a consequence, the charge density rises, increasing volumetric efficiency significantly. In addition, ethanol has a lower adiabatic flame temperature, cetane number, and ignition quality than gasoline. , Heidari et al tested biodiesel and bioethanol mixed diesel made from soybean oil. The fuel density and CN of tested fuel dropped as the biodiesel blending ratio was increased.…”

“…However, adding butanol resulted in a slight reduction in engine torque and BP and increased fuel consumption. Zhang et al 70 observed an increase in the BSFC and BTE when up to 15% butanol was added to the palm biodiesel-diesel blend (B20). Another researcher discovered that adding up to 10% butanol to a Jatropha biodiesel-diesel blend (B20) reduced the engine BSFC by 3.9% on average at constant engine load and varied speeds.…”

Investigation on gaseous fuels interchangeability with an extended zero-dimensional engine model

“…The most frequently employed method is to assume the thermodynamic parameters as constant according to empirical [23] or experimental data [24], or calculate them by the properties and mass fraction assuming that the working medium consists of several basic species [16] . It is reported in [26] that the latter method can achieve higher accuracy as it considers the variation of in-cylinder working medium composition and thermodynamic properties [26]. Ding [27] investigated the thermodynamic properties of the fuel and the in-cylinder working medium in diesel engines by using a first principles calculation method considering the thermodynamic properties functions of the working medium temperature and composition.…”