Inflammability evaluation of hydrocarbon fuels mixtures formed directly in the combustion chamber

Abstract

The proposed article involves an investigation of the processes taking place during the preparation of mixed fuels that are combined directly before combustion. The fuel dose formed in this way must take into account the qualitative and quantitative composition of the fuels and the amount of air in the process. Given that liquid fuels similar to gasoline (e.g. methanol, ethanol, butanol) are characterized by different properties, their comparison would be useful in order to use their ratio to influence the combustion process. The process of fuel preparation plays a decisive role in this issue. The article describes abilities of modelling the injection of various fuels simultaneously to the combustion chamber for creating fuel mixture directly before ignition. First part of the article consists of analysis of light hydrocarbon fuels mixing abilities, supported with present research data. Next part describes the evaluation of execution of the assumed system – two fuel injectors with analysis of spray penetration. The modelling of the injection and spray was performed in the AVL FIRE 2014.2 environment and the results were presented. The injection possibility was proven by injecting the fuel to the combustion chamber model. Local values of air-fuel ratio, density and ambient pressure were presented to better understand the potential in mixing fuels directly before ignition. The conclusion includes description of fuel mixing abilities, influence of various fuels on creation of a stratified mixture and definition of controllability of charge ignition.

The impact of injector placement on the dose preparation conditions in a gasoline direct injection system

“…The proposed tests are a part of the study stage on the injection and combustion processes using a direct injection of liquid hydrocarbon fuels [11]. This stage focuses on determining the indicators for engine processes using one direct injection gasoline injector depending on its location in the combustion chamber of the internal combustion engine.…”

“…alpha(15 deg) = Σ y(i)z(j)alpha(15) alpha(17.5 deg) = Σ y(i)z(j)alpha(17,5) (10) alpha(20 deg) = Σ y(i)z(j)alpha(20) (11) where: i = 7 mm, 8 mm and 9 mm, j = 9 mm, 10 mm and 11 mm, while k = 15, 17.5 and 20 deg. Fig.…”