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An Investigation of the Physical and Chemical Factors Affecting the Performance of Fuels in the JFTOT
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Abstract
Earlier research performed by Shell Research sought to compare the performance of fuels in the Jet Fuel Thermal Oxidation Tester (JFTOT) with that in a simulated engine oil cooler. However the agreement between the rigs was poor and initial attempts to improve the correlation by modifying various JFTOT operating parameters were ineffective. Now, those same operating parameters have been readdressed in more detail, in order to determine the physical and chemical factors which control fuel response in the JFTOT.
Flowrate experiments and activation energy measurements have indicated not only that the JFTOT's response to a fuel depends on the relative roles of chemical reaction and physical transport, but more significantly, the contribution of the two effects is fuel dependent.
Studies of test section metallurgy reveal that whilst differences between aluminium and stainless steel are clearly discernible under certain conditions, such differences become irrelevant as fuel degradation proceeds and the metal surface becomes lacquered.
The findings provide an explanation as to why no improvement could be made in the correlations exhibited by the earlier experiments. In addition, they enable us to offer tentative design criteria for a new small scale thermal stability test.
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Authors
Citation
Clark, R. and Thomas, L., "An Investigation of the Physical and Chemical Factors Affecting the Performance of Fuels in the JFTOT," SAE Technical Paper 881533, 1988, https://doi.org/10.4271/881533.Also In
References
- Manual of ASTM standards 05.03 1987
- Kendall D.R. Mills J.S. The influence of JFTOT operating parameters on the assessment of fuel thermal stability Aerospace Technology Conference and Exposition Long Beach, Ca. October 1985 SAE 851871
- Manual of ASTM standards 05.01 1987
- Procurement Executive, Ministry of Defence 9 1983
- Kendall D.R. Clark R.H. Stevenson P.A. The Influence of Polar compounds on the Stability of Jet Fuel 2nd International Conference on Long-Term Storage Stability of Liquid Fuels San Antonio, Tex. July 1986 1986
- Hazell L.B. Baker C. David P. Fackerell A.D. An AES Depth profiling study of deposits formed on aluminium during the Jet Fuel Thermal Oxidation Test Surface and Interface Analysis 9 507 1986
- Kendall D.R. Mills J.S. Thermal Stability of Aviation Kerosines, Techniques to characterise their Oxidation Properties Ind. Eng. Chem. Prod. Res. Dev. 25 360 June 1986
- Kendall D.R. Clark R.H. Wolveridge P.E. Fuels for Jet Engines: The Importance of Thermal Stability Aircraft Engineering 59 12 Burnhill publications Dec 1987
- Kendall D.R. Houlbrook G. Clark R.H. Bullock S.P. Lewis C. The thermal degradation of aviation fuels in jet engine injector feed-arms. Part 1 - Results from a full-scale rig Paper 87-IGTC-49 International Gas Turbine Congress Tokyo Oct 1987