Análise do consumo de ar em um motor alternativo ciclo Otto pela concentração de oxigênio nos produtos de combustão

Abstract

Engines are machines which convert any type of energy into mechanical energy or power to produce force and motion. In internal combustion engines of the Otto cycle fuel system is responsible for preparing the air / fuel mixture in an appropriate rate to ensure the best operation of the equipment. When the air / fuel rate under operating conditions is higher than the stoichiometric it is said that the mixture is poor since it contains more air than required for the combustion reaction to occur. When the opposite happens it is said that the mixture is rich. The internal combustion engines of Otto cycle are also known as spark-ignition engines, because the combustion reaction is initiated by the release of energy in a spark plug that causes a spark. In this type of engine, the fuel system tries to maintain the mixture nearer to the conditions of stoichiometry, slightly poor to ensure complete fuel combustion. The quality of the mixture can be determined by the presence of oxygen in the combustion products and the device used to make this measurement is lambda probe. The engine’s air consumption is directly related to the power generation itself and this consumption can be determined by mass balance between reactants and products. This study aims to conduct a study on the air consumption of an engine Ford Zetec Rocam Flex 1000 cc using a gas analyzer to measure the presence of oxygen in the exhaust countertop using anhydrous ethanol.