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Pulse detonation?
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Pulse detonation?
(Arthur Hansen) wrote in message . com...
(Iain McClatchie) wrote in message . com... The article is enthusiastic but not informative. Here's a basic question: why would a pulse detonation engine be any more efficient than a fanjet? The basic premise is that "exploding" fuel is more energetic and efficient than just burning it, isn't it? No. The energetic content of a fuel is essentially the same for detonation vs. burning. There is *slightly* greater energy release in the detonation case due to suppressed chemical dissociation at the high pressures in detonations vs. flames for the same initial conditions, but this is negligible for propulsion applications. Experiments we have done at McGill University have shown that the impulse imparted on a tube containing hydrogen-oxygen mixtures is independent of whether it is detonated or simply burned in a high-speed, turbulent flame. The net impulse appears to be simply a function of the chemical energy content of the mixture and independent of how that energy is released. See our publication: Kiyanda, C.B., Tanguay, V., Higgins, A.J., and Lee, J.H.S., "Effect of Transient Gas Dynamic Processes on the Impulse of Pulse Detonation Engines," Journal of Propulsion and Power, Vol. 18, No. 5, September 2002, pp. 1124-1126. ...available in most engineering libraries. -- Andrew J. Higgins Mechanical Engineering Dept. Assistant Professor McGill University Shock Wave Physics Group Montreal, Quebec CANADA http://www.mcgill.ca/mecheng/staff/academic/higgins/ |
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