Autoxidation of jet fuels: Implications for modeling and thermal stability

Conference · Mon May 01 04:00:00 EDT 1995

OSTI ID:45051

Heneghan, S P ^[1]; Chin, L P ^[2]

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1. Univ. of Dayton Research Institute, OH (United States)
2. Systems Research Laboratories, Inc., Dayton, OH (United States)

The study and modeling of jet fuel thermal deposition is dependent on an understanding of and ability to model the oxidation chemistry. Global modeling of jet fuel oxidation is complicated by several facts. First, liquid jet fuels are hard to heat rapidly and fuels may begin to oxidize during the heat-up phase. Non-isothermal conditions can be accounted for but the evaluation of temperature versus time is difficult. Second, the jet fuels are a mixture of many compounds that may oxidize at different rates. Third, jet fuel oxidation may be autoaccelerating through the decomposition of the oxidation products. Attempts to model the deposition of jet fuels in two different flowing systems showed the inadequacy of a simple two-parameter global Arrhenius oxidation rate constant. Discarding previous assumptions about the form of the global rate constants results in a four parameter model (which accounts for autoacceleration). This paper discusses the source of the rate constant form and the meaning of each parameter. One of these parameters is associated with the pre-exponential of the autoxidation chain length. This value is expected to vary inversely to thermal stability. We calculate the parameters for two different fuels and discuss the implication to thermal and oxidative stability of the fuels. Finally, we discuss the effect of non-Arrhenius behavior on current modeling of deposition efforts.

• Research Organization: USDOE Assistant Secretary for Fossil Energy, Washington, DC (United States). Office of Technical Management
• OSTI ID: 45051
• Report Number(s): CONF-941022--Vol.1; ON: DE95008873; CNN: Contract F33615-92-C-2207; Contract F33615-90-C-2033
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
ACTIVATION ENERGY
ARRHENIUS EQUATION
DEPOSITION
JET ENGINE FUELS
OXIDATION
STABILITY