4.11.3 Mixing and combustible mixture compositions
Mixing of fuel is the process of mixing finely atomized fuel with air.
It is necessary that the mixture being prepared, which is called the fuel-air mixture, satisfies two basic requirements:
1) the mixture, when ignited inside the engine cylinder, must burn very quickly, in a time interval measured in thousandths of a second, in order to ensure the appropriate gas pressure on the piston at the beginning of its working stroke;
2) gasoline in the air-fuel mixture must burn completely in order to provide the greatest heat release and increase the economy of the engine.
This mixture can burn quickly and completely, provided that gasoline and air are mixed in a strictly defined weight proportion, and there is a very thorough atomization and evaporation of gasoline in the air and their mixing.
In this case, each smallest particle of fuel will be surrounded by oxygen particles in the required amount, which will ensure the simultaneous rapid and complete combustion of the entire mixture.
Depending on the weight ratio of gasoline and air, the following types of mixtures are distinguished: normal, diluted, lean, enriched, and rich.
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