Theoretical Analysis of Mixture Stoichiometry in Engine Carburetor

A theoretical analysis of the stoichiometry of the mixture produced in a main fuel system of the engine carburetor is presented. The analysis made it possible to develop a computer code which was applied to the particular Weber type carburetor from a small, two-cylinder car engine. The operation of the carburetor in the regimes of the steady and unsteady flow, including the influence of back flows, was investigated. It is concluded that the air pressure pulsations and, in particular, the existence of the back flows cause the significant enrichment of the mixture produced in the carburetor.