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Abstract(s)
A presente dissertação aborda o estudo de um motor de combustão interna que
funciona segundo o ciclo Otto, sendo o combustível queimado composto por hidrogénio e
metano. Este estudo tem como finalidade avaliar os efeitos da adição de hidrogénio ao
metano, tendo sido estudados os impactos nas emissões, na temperatura adiabática de
chama e na energia libertada.
Inicialmente, realizou-se uma pesquisa bibliográfica, de modo a enquadrar o tema,
onde se abordaram as seguintes temáticas: motores de combustão interna; ciclo Otto;
combustão; injeção de combustível; hidrogénio.
Relativamente aos métodos utilizados, apresentam-se o método do equilíbrio químico,
a metodologia para o cálculo da temperatura adiabática de chama, assim como a metodologia
para o cálculo da energia libertada na combustão.
Obtidos os resultados, chegou-se à conclusão que, a adição de hidrogénio ao metano,
reduz substancialmente as emissões de dióxido de carbono e de monóxido de carbono,
aumenta a temperatura adiabática de chama e diminui a energia que se liberta na combustão.
Expecta-se que todo o estudo apresentado nesta dissertação seja utilizado para
futuras análises aos motores de combustão interna que utilizem hidrogénio como combustível,
de maneira a facilitar e, consequentemente, acelerar a chegada a uma conclusão
relativamente à viabilidade do uso de hidrogénio como combustível alternativo aos
combustíveis fósseis.
The present dissertation addresses the study of an internal combustion engine that works according to the Otto cycle, burning fuel composed by a mixture of hydrogen and methane. The goal of this study is to evaluate the effects of adding hydrogen to methane, having been studied the impacts on the emissions, the adiabatic flame temperature and the energy released. Initially, a bibliographic research was made in order to frame the topic, wich covered the following themes: internal combustion engines; Otto cycle; combustion; fuel injection; hydrogen. The methods used include the chemical equilibrium method, the methodology used for calculating the adiabatic flame temperature, as well as the methodology for calculating the energy released during the combustion. After the results were obtained, it was concluded that adding hydrogen to methane substantially reduces carbon dioxide and carbon monoxide emisions, increases the adiabatic flame temperature and diminishes the energy released in the combustion. It is expected that the entire study presented in this dissertation will be used for future analyses on internal combustion engines using hydrogen as fuel, with the goal of facilitating and, consequently, accelerating the conclusion regarding the viability of using hydrogen as an alternative fuel to fossil fuels.
The present dissertation addresses the study of an internal combustion engine that works according to the Otto cycle, burning fuel composed by a mixture of hydrogen and methane. The goal of this study is to evaluate the effects of adding hydrogen to methane, having been studied the impacts on the emissions, the adiabatic flame temperature and the energy released. Initially, a bibliographic research was made in order to frame the topic, wich covered the following themes: internal combustion engines; Otto cycle; combustion; fuel injection; hydrogen. The methods used include the chemical equilibrium method, the methodology used for calculating the adiabatic flame temperature, as well as the methodology for calculating the energy released during the combustion. After the results were obtained, it was concluded that adding hydrogen to methane substantially reduces carbon dioxide and carbon monoxide emisions, increases the adiabatic flame temperature and diminishes the energy released in the combustion. It is expected that the entire study presented in this dissertation will be used for future analyses on internal combustion engines using hydrogen as fuel, with the goal of facilitating and, consequently, accelerating the conclusion regarding the viability of using hydrogen as an alternative fuel to fossil fuels.
Description
Keywords
Internal combustion engines Otto cycle Combustion Hydrogen Methane Motores de combustão interna; Ciclo Otto Metano Combustão Hidrogénio