By Gordon C. Oates
Starting with the elemental rules and ideas of aeropropulsion combustion, this article is going directly to discover particular methods, obstacles and analytical equipment as they endure on part layout. The textual content positive factors invited paintings of renowned experts in plane fuel turbine engines.
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Extra resources for Aerothermodynamics of Aircraft Engine Components (AIAA Education Series) (Pandora Books)
S. Navy to use a third fuel type, JP-5, which has an even higher flash point (> 63°C). 7. Approximate yearly consumption figures for 1984 are also shown. 7 Summary This chapter has reviewed fundamental concepts necessary for the understanding of aeropropulsion combustion. Two additional chapters will consider the practical application of this information to mainburners and afterburners. Much of this chapter has reflected the theme that the subject of combustion involves interdisciplinary study of chemistry, thermodynamics, and gasdynamics.
In real systems, the observed effect of a pressure decrease is that combustion efficiency falls off badly when the pressure is reduced below some limiting value, often on the order of 1 atm. This pressure limit is a major restriction on the operating range for an afterburner. 4 Ignition The fuel-air mixture produced by the injection process has a flame propagation velocity that is much lower than the gas speed in the combustion chamber. Thus, unless sources of continuous ignition are present in the chamber, the burning gas ignited by a temporary process will be blown out of the engine as soon as the ignition is stopped.
100 I'-- 50 0 I 0 20 40 I I 60 I 80 I 100 % EVAPORATED Fig. 21 Distillation characteristics of common jet fuels (from Ref. 29). T the initial or final temperature (approximately 298 K), and J the mechanical equivalent of heat. 6. While differences in the heats of combustion among hydrocarbons are relatively small, differences in volatility are substantial. Fuels can range from methane (boiling point of - 1 6 1 ° C ) to heavy liquid hydrocarbons containing napthalene (boiling point of 211°C). In nonaircraft turbine applications, future fuel candidates include even residual oils (which have nonvolatile components).