The Physics Of Combustion Engines - 938 Words

Throughout the life of combustion engines the goal has been to make them more efficient. Higher efficiency lead to increased engine performance and power output, and a reduction in fuel consumption. The Weber (We) number, shown in Equation (1), relates a fluid’s inertial forces to its surface tension forces making it useful in analyzing the atomization of fuel in a combustion engine. We=Dynamic PressureSurface Tension Pressure=⠍ ´U2(/D) (1) The three main things that are required for combustion are; fuel, oxygen and ignition. For an engine to achieve higher performance and run more efficiently, it is best to have a fully vaporized fuel. This leads to a more complete combustion and less waste. For best results the fuel droplets should be small, this will help them vaporize uniformly. When injecting fuel into combustion engines, a higher Weber number is desirable and will help produce a clean burning and efficient combustion cycle. By examining the Weber number more in depth, it is apparent that optimizing the parameters of Equation (1) will help raise the Weber number significantly and increase the performance of internal combustion engines. It is well known that a higher Weber number is better for good atomization of fuel in an internal combustion engine. The U shown in the Equation (1) is the velocity of the fuel relative to the surrounding air. A common atomization method for gasoline engines is to spray fuel at high velocities into the combustionShow MoreRelated The Physics of a Diesel Engine Essay921 Words   |  4 PagesThe Physics of a Diesel Engine The world we live in is surrounded by diesel engines. They are on the freeways, railways, airways, and are one of the leading electricity producers in the world. They are also becoming more popular in automobiles. These engines are efficient and reliable and they are getting very sophisticated. However, the physics behind these engines has not changed. 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