Abstract
Keywords: alcohol, injection.
Sprays processes play an important role in many technical systems. For example there could be spray cooling, spray painting, spray combustion in furnaces, gas turbines, rocket engines as well as diesel and gasoline engines.
In the particular case of internal combustion engines, sprays have some particular things. In order to assure a good running of the ICE, the spray should mix with the surrounding gas (air) and form an ignitable mixture. Because air and fuel are in different states, the fuel should first vaporize. The vaporization is a process which depends on surface. The larger the surface is the quicker the fuel vaporizes. This is why the fuel should be broken in small droplets which will have a larger vaporizations surface than a big droplet. After having the fuel vaporized the next step is to assure the rapid mixture with the air. In a quiescent environment this phenomena produces with low rates. Because of this in modern ICE one of the goals of combustion chamber design is to have a high level of turbulence. The fuel jet in direct injection engines (gasoline or diesel ones) represents the main source of turbulence in combustion chamber besides the turbulence induced by piston move. Fuel vaporization and its mixture with the air are two basic elements of the combustion process. If the fuel vaporizes quick and the mixture air-fuel touches the ignitable limits in a short time, all conditions for a rapid, clean and efficient combustion are achieved.