Abstract
The effect of fuel volatility on the lean blow-off limit and the temperature distribution in a swirl type combustor was studied. The flame stabilizing mechanism was also discussed. The fuels used were gasoline, kerosene and two types of heavy oils. Gasoline and heavy oil were used as the most and the least volatile fuels respectively. For all fuels used, the blow-off limit shifts to the lean side by increasing the swirl numberof the flow, i.e. the flame stability increases. With a weak swirl, the fuel volatility has the higher effect on the blow-off limit than with the strong one where the established recirculation zone has the higher effect on the flame stability. In the absence of a swirl, only one main reaction zone is formed inside the flame around its axis. With a strong swirl, two main reaction zones are formed for kerosene and heavy oil flames, but only one reaction zone for a gasoline flame.
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