Effect of fuel volatility characteristics on ignition-energy requirements in a turbojet combustor

Foster, Hampton H., Straight, David M.

The effect of fuel-volatility characteristics on the ignition-energy requirements in a turbojet combustor was investigated. Data were obtained at simulated static sea-level engine starting conditions for a wide range of combustor-inlet air and fuel temperatures and also for a range of altitude inlet-air pressures and two air flows. In order to determine the relative ignition characteristics of the fuels at various combustor-inlet pressures and two air flows, a relation between the minimum ignition-energy requirements and an empirical function of combustor inlet-air pressure and velocity (V/square root of P) was developed. The data obtained at both sea-level and altitude conditions showed that the A.S.T.M. 15-percent evaporated temperatures of the fuels were generally indicative of their ignition characteristics; whereas, the Reid vapor pressures of the fuels were not.

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