EMULSIFIED FUELS COMBUSTION STUDY
Final rept. 29 Jun 1967-28 Sep 1968
PRATT AND WHITNEY AIRCRAFT GROUP EAST HARTFORD CT
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The report describes a research program conducted to determine the cold flow, combustion, and corrosion characteristics of three different Government selected and supplied emulsified JP-4 fuels and to compare them to liquid JP-4 fuel. The program consisted of a study of the emulsified fuel flow and spray characteristics, an evaluation of the combustion and altitude relight capabilities of emulsified fuels relative to JP-4 fuel using a can-type burner rig that simulates a gas turbine environment, and an evaluation of the corrosion characteristics of the emulsified fuels relative to liquid JP-4 on several coated and uncoated turbine materials when operating at 1700F and 2000F average combustor exit temperatures for 75 hours each. The cold flow test results show that, except for individual deviations due to formulation differences, the flow behavior of two out of the three emulsified fuels through a typical gas turbine fuel system is nearly identical to the flow of liquid JP-4 fuel. The spray characteristics of these emulsified fuels flowing through a pressure atomizing fuel nozzle were found to be essentially identical to liquid JP-4. The results indicated that only minor differences in combustor performance exist between JP- 4 and emulsified fuel under the steady-state conditions tested. The same was found to be true for light-off transient and altitude relight conditions. The steady-state corrosion tests have shown some minor distress in the turbine materials caused by two of the emulsified fuels, whereas major distress was associated with the third emulsified fuel.