Fuel availability studies indicated that the relaxation of the F-44 freeze point specification could greatly increase the yield of F-44 per barrel of crude. A thorough analysis was initiated to ensure that the higher freeze point fuel would not form solid wax precipitates during low temperature operations that could impact aircraft mission performance. In order to evaluate the effects of a potential change in the freeze point specification over the entire inventory of United States Naval aircraft, a general three dimensional computational fluid dynamics code, PHOENICS 84, was modified for use. Inputs into the code include tank geometry (cylindrical, rectangular or body fitted), mission profile (outside air temperatures or altitude, airspeed and time on station), and fuel properties (specific heat, thermal conductivity, viscosity, freeze point, etc). Output from the model include fuel cooldown and holdup (unpumpable frozen fuel) by experimental data obtained during flight and simulator testing of instrumented tanks.
The development of a computational model to predict low temperature fuel flow phenomena
Entwicklung eines mathematischen Modells zur Voraussage von Kraftstofffließeigenschaften bei niedrigen Temperaturen
1990
13 Seiten, 10 Bilder, 17 Quellen
Aufsatz (Konferenz)
Englisch
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