Summary
The present research contract, carried out in the framework of a French working group CEA-EDF-ENSMA, was divided into four phases:
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Phase 1 : Scaling effects on a pressure field generated by spontaneous accelerations of deflagrations in a homogeneous medium : these “CHARLES” tests performed on completely unconfined charges of ethylene-air and acetylene-air mixtures (V≃12 m3) have demonstrated the high sensitivity of the pressure field to the flame acceleration, particularly at the end of the propagation.
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Phase 2 : Effect of a sudden discontinuity in the concentration of the combustible gas on the deflagration speed in a heterogeneous medium : this discontinuity was obtained using two concentric latex balloons, filled with different hydrocarbon concentrations and also destroyed before firing.
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Phase 3 : Study of pseudo-detonation modes for the explosion of spherical ethylene-air mixtures : these modes were sought by increasing an explosive plastic mass associated to the igniter.
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Phase 4 : Study of the influence of cloud shape, ignition point location and simple obstacles in the flame path on the pressure field generated by the explosion. A retractable enclosure was designed, built and unfortunately destroyed by the second test.
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References
Brossard, J et al. (1983) -Air blast from unconfined gaseous detonations IX ICODERS — Poitiers.
Brossard, J et al. (1983) — Experimental analysis of unconfined explosions of air — hydrocarbon mixtures — Characterization of the pressure field — 4th International Symposium on Loss Prevention — Harrogate.
Perrot, J (1981) — Essai s CHARLES l — Déflagration de mélanges homogènes en milieu non confiné — Contrat CEEA/CEA — SRF/005 F — (S).
Leyer, J. C et al. (1981) — PHASE 1 — Rapport d’ interpretation des essais “CHARLES” (déflagration lente) — Contrat CEEA/CEA — SRF/005 F — (S).
Deshaies, B and Leyer, J.C (1981) — Flow field induced by unconfined spherical accelerating flames — Combustion and flame 40 (p. 141 to 153).
Perrot, J (1983) — Essais Charles 2 — Déflagraton de mélanges homogènes à concentration variable — Contrat CEEA/CEA - SRF/005 F - (S).
Desbordes, D et al. (1983) — Phase 2 — Rapport d’ interprétation des essais Charles 2: mélanges homogènes de concentrations variables.
Perrot, J (1984) — Essais Charles (Phase 3) — Compte rendu d’ essais — Contrat CEEA/CEA — SRF/005 F — (S).
Brossard, J et al. (1984) — Phase 3 — Rapport d’ interprétation des essais Charles 3: effets d’ un amorçage fort sur l a propagation de l a déflagration — Contrat CEEA/CEA — SRF/005 F — (S).
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© 1985 ECSC, EEC, EAEC, Brussels and Luxembourg
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Brossard, J. et al. (1985). Characterization of the Pressure Field Induced by the Explosions in Air of a Hydrocarbon-Air Mixture, with Slow Deflagration or Fast Deflagration. In: Skupinski, E., Tolley, B., Vilain, J. (eds) Safety of Thermal Water Reactors. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-4972-0_26
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DOI: https://doi.org/10.1007/978-94-009-4972-0_26
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