Gaseous Detonations: Their nature, effects and control by M.A. Nettleton

By M.A. Nettleton

My creation to the interesting phenomena linked to detonation waves got here via appointments as an exterior fellow on the division of Physics, college university of Wales, and on the division of Mechanical Engineering, collage of Leeds. Very exact thank you for his exact information during the huge physique of data on gaseous detonations are because of Professor D. H. Edwards of college collage of Wales. certainly, the hard job of concisely enumerating the most important good points of unidimensional theories of detonations used to be undertaken by way of him, and bankruptcy 2 relies on his preliminary draft. whilst the textual content strays to using we, it's a deserved acknow­ ledgement of his contribution. back, I should still prefer to thank Professor D. Bradley of Leeds collage for his enthusiastic encouragement of my efforts at constructing a version of the composition limits of detonability via a courting among run-up distance and composition of the aggregate. The textual content has been ready within the context of those fellowships, and i'm thankful to the primary electrical energy producing Board for its permission to simply accept those appointments.

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Sample text

Regions I and II correspond to the detonation branch of the R-H curve. On AJBC, P2> PI and V2< VI. so that the final states correspond to a compressive shock in both regions I and II. The properties of this branch are most readily described by constructing a secant through 0, which intersects the final R-H curve at Sand W. , defined by the slope, tan a, of the secant, there are in general two solutions for the end states Sand W. The solution corresponding to S is the higher pressure and consequently is referred to as a strong detonation, whereas that corresponding to W is denoted a weak detonation.

The reaction is represented by a single forward-rate process, gradually progressing to completion some distance behind the precursor shock. The extent of reaction is measured in terms of a reaction coordinate, g, which has the value 0 immediately behind the front and unity at the plane at which reaction is complete. 12 between the control plane 1 and a plane characterized by the fraction g, where the energy released is qg, gives a corresponding R-H curve. Thus, for each plane there is an R-H curve, and the complete reaction zone is described by a family of R-H curves.

1 Comparison of experimental and calculated C-J velocities in diluted oxyhydrogen mixtures [8]. 2 Comparison of experimental and C-J velocities calculated from more accurate thermochemical data [54]. 8 a wide range of dilutions. A reassessment of the theoretical values using more accurate thermochemical data resulted in improved agreement, to better than ±2%. 2. 8%. Although agreement between theory and experiment for stoichiometric mixtures appears impressively good, it is generally accepted that the theory considerably overestimates velocities in mixtures nearer to the limits of detonability.

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