Ignition performance of liquid fuel spray at various fuel/air ratios and the effect of gaseous fuel addition on ignition improvement were investigated on a gas turbine combustor test facility. Distribution of fuel/air ratio with gaseous fuel addition through the spark plug and the fuel nozzle into the flame tube was measured respectively. The universal ignition criterion derived from developed thermal explosion physical model at maximum chemical reaction rate for heterogeneous mixture ignition and the empirical formula of evaporation coefficient in fuel spray are in good agreement with experimental data obtained in dense and dilute fuel spray, and homogeneous mixture.

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