A Garrett T76 turboprop was used as the test vehicle to evaluate the effects of varying fuel properties on engine hot-section performance and durability. This program was funded by the Naval Air Propulsion Center (NAPC) as part of their program to determine fuel effects on Navy fleet engines. The test fuels were supplied by NAPC and the fuel properties covered a range of values that are being considered for possible future fuel specification modification.
Testing was performed on a full-scale combustion rig at conditions duplicating actual engine operation and on a T76 engine. Rig tests were used to determine turbine inlet temperature quality, lean stability, and ground ignition and altitude relight limits. Engine tests evaluated combustor liner temperatures, gaseous emissions, smoke, carbon deposition and fuel thermal stability. Following testing, regression analyses were performed to quantify the effects of specific fuel property values on combustor performance and durability.
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