Abstract
Equations for predicting and correlating the combustion efficiencies of gas turbine combustors are derived for conditions where the heat release is limited either by chemical reaction, mixing or evaporation, or by a combination of reaction and evaporation. Methods for calculating the critical mean drop size, £>crit, above which evaporation becomes the rate-controlling step are presented. It is shown that />cri, increases with increase in combustion volume, combustion pressure, liner pressure drop, and fuel volatility, and diminishes with increase in gas velocity. It is also shown that the ignition energy requirements of liquid hydrocarbon fuels are influenced mainly by their viscosity and volatility, which together govern the rate of fuel evaporation in the ignition zone.
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