A fundamental understanding of the effect of low dissolved oxygen concentrations on thermal stability (thermal stability refers to the deposit forming tendency of the fuel) is incomplete but is essential for aircraft fuel system design. At high altitudes, the ambient pressure and temperature are reduced significantly, resulting in the diminished solubility of dissolved oxygen. In addition as a fire preventative measure, an on-board inert gas generating system (OBIGGS) may be used to reduce the oxygen level in the liquid fuel. Since these features lessen the dissolved oxygen concentration of the fuel, it is imperative to understand the effect of reduced oxygen levels on the formation of jet fuel deposits. For this purpose, we have conducted experiments using a flowing system in which the dissolved oxygen level at the entrance of the apparatus is varied. One of the most intriguing results found is the increase in deposits in heated sections for decreased oxygen consumption. This observation is seemingly contrary to nearly all previous observations concerning the relation between deposit formation and oxygen consumption. For a given system, there appears to be an unfavorable dissolved oxygen concentration which produces the maximum amount of deposits. In addition, it was found that the deposition mechanisms in heated locations were quite different from those in cooled regions.
Reduced dissolved oxygen and jet fuel deposition
Reduzierter gelöster Sauerstoff und Flugbenzinablagerung
1995
8 Seiten, 4 Bilder, 6 Tabellen, 22 Quellen
Conference paper
English
British Library Conference Proceedings | 1995
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