Accession Number : ADP003129

Title :   Alternative Fuel Deposit Formation,


Personal Author(s) : TeVelde,J. ; Spadaccini,L. J. ; Szetela,E. J. ; Glickstein,M. R.

Report Date : 1984

Pagination or Media Count : 10

Abstract : A heated-tube apparatus was used to evaluate the deposit formation rates of four liquid hydrocarbon fuels and to determine the effect fuel deposits have on the heat transfer characteristics of aircraft gas turbine fuel systems. The fuels tested were: a low- aromatic JP-5, a blend of 80 percent JP-5 20 percent hydrocracked gas oil, a blend of 50 percent JP-5 and 50 percent No. 2 heating oil, and a shale derived JP-5. Deposit formation rates ranging from 10 microgram/sq cm hr to 3000 microgram/sq cm hr were obtained at tube wall temperatures ranging from 480 K to 800 K, with peak formation rates occurring at initial surface temperatures of 644 K to 672 K. Results indicate that deposit formation rate correlates very well with initial surface temperature and the thermal stability rankings derived from present experimental results agree very well with rankings based upon independent JFTOT analysis. The deposit thermal resistance, as calculated from heat transfer measurements, correlates well with measured deposit quantity and thickness. Heat transfer analyses indicate that the deposit thermal conductivity increases with increasing deposit thickness, and ranges from values approximating the thermal conductivity of the fuel to values approaching that of amorphous carbon. (Author)

Descriptors :   *Combustion products, *Heat transfer, *Jet engine fuels, Deposits, Deposition, Rates, Hydrocarbons, Model tests, Blending, Heating oils, Thickness, Quantity, Thermochemistry, Thermal stability, Thermal conductivity, Surface temperature, Carbon, Amorphous materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE