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DDT in fuel–air mixtures at elevated temperatures and pressures

Content Provider	Springer Nature Link
Author	Card, J. Rival, D. Ciccarelli, G.
Copyright Year	2005
Abstract	An experimental study was carried out to investigate flame acceleration and deflagration-to-detonation transition (DDT) in fuel–air mixtures at initial temperatures up to 573 K and pressures up to 2 atm. The fuels investigated include hydrogen, ethylene, acetylene and JP-10 aviation fuel. The experiments were performed in a 3.1-m long, 10-cm inner-diameter heated detonation tube equipped with equally spaced orifice plates. Ionization probes were used to measure the flame time-of-arrival from which the average flame velocity versus propagation distance could be obtained. The DDT composition limits and the distance required for the flame to transition to detonation were obtained from this flame velocity data. The correlation developed by Veser et al. (run-up distance to supersonic flames in obstacle-laden tubes. In the proceedings of the 4th International Symposium on Hazards, Prevention and Mitigation of Industrial Explosions, France (2002)) for the flame choking distance proved to work very well for correlating the detonation run-up distance measured in the present study. The only exception was for the hydrogen–air data at elevated initial temperatures which tended to fall outside the scatter of the hydrocarbon mixture data. The DDT limits obtained at room temperature were found to follow the classical d/λ = 1 correlation, where d is the orifice plate diameter and λ is the detonation cell size. Deviations found for the high-temperature data could be attributed to the one-dimensional ZND detonation structure model used to predict the detonation cell size for the DDT limit mixtures. This simple model was used in place of actual experimental data not currently available.
Starting Page	167
Ending Page	173
Page Count	7
File Format	PDF
ISSN	09381287
Journal	Shock Waves
Volume Number	14
Issue Number	3
e-ISSN	14322153
Language	English
Publisher	Springer-Verlag
Publisher Date	2005-09-12
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Deflagration-to-detonation transition Detonation Flame Fluids Thermodynamics Acoustics Condensed Matter Solid State Physics and Spectroscopy Mechanics, Fluids, Thermodynamics
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Mechanical Engineering

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