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STUDY OF NOZZLES TO SPRAY CONTAMINATED FUEL
MITCHELL, JAMES P.
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Abstract
The effects of contaminated fuel on the performance of turbojet main burner fuel nozzles and the resulting effect on turbojet performance was studied. The fuel used was contaminated with MIL-E-5007B contaminant, plus fungus. The program included a study of the effects of contaminant accumulation on nozzle performance; a study of the effects of poor nozzle performance resulting from the use of contaminated fuel on turbojet performance; nozzle spray tests in which several different nozzles were evaluated during cold-flow contaminated fuel spray tests; burner can tests in which the effects of burning contaminated fuel in a conventional turbojet were determined; a study in which the results of the burner can tests were used to determine the effects of burning contaminated fuel on turbojet performance; and a nozzle design study in which an air atomizing nozzle, an impingement nozzle, and two types of pressure atomizing nozzles were compared to determine which nozzle could be best for spraying contaminated fuel. Contaminant accumulation in the nozzle can distort uniformity of the spray being emitted from a nozzle and also change its flow schedule. Contaminated fuel has little effect on large swirl type nozzles. Air atomizing nozzles have the largest metering passages of the nozzles considered.