Abstract
An experimental study was carried out on the effects of swirl flow on the formation of a combustible mixture before and after ignition. The concentrations of gaseous hydrocarbons were traced for sprays injected into air or nitrogen under various swirl velocities, using a rapid compression machine and a total gas sampling device. The results obtained suggest that the strong swirl flow advances the commencement of fuel oxidation after fuel injection starts due to its ability to supply much oxygen into the spray, though it reduces the temperature of the surrounding air. At very low ambient temperature, the strong swirl tends to cause misfire. But at the high temperature, it greatly increases the fuel-air mixing rate and can almost perfectly oxidize lighter hydrocarbons, giving a very rapid combustion.
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