Development of a catalytic combustor fuel/air carburetion system

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Development of a catalytic combustor fuel/air carburetion system

Roffe, G.

Candidate fuel/air carburetion systems were screened to determine their ability to produce a uniform mixture of Jet A fuel air. Pressure, air blast and air-assist atomization techniques were examined. The air-assist fuel injection scheme was selected as most appropriate and was modified by the use of a variable angle swirl generator to produce acceptably flat fuel and velocity profiles at the system exit. The device was tested over a range of air velocity, inlet pressure, inlet temperature and fuel/air ratio. Profiles of velocity, fuel concentration and degree of vaporization were measured at the exit plane and at an intermediate station 75 % of the distance between the injector and the exit. Velocity profiles were found to have a standard deviation of only 10.5 % from the ideal case, while the average deviation of the fuel concentration profile was 8.3 % from ideal. Measurements indicated that the complete vaporization was achieved prior to the system outlet plane. Two units of the tested system were fabricated and delivered to the Air Force Aero Propulsion Laboratory. (DePo)