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Communication dans un congrès

Critical Dynamics of Direct Initiation of Spherical Detonations

Abstract : The asymptotic limit of small heat release is investigated in the context of the critical dynamics of detonation direct initiation. The analysis, limited to spherical geometry, includes unsteadiness, curvature effects, and the gradient of the burnt-gas flow. Numerical integration of the hyperbolic equation governing the dynamics provides the basis of the study. The critical trajectories "detonation velocity vs radius" are characterized by a decay well below the CJ velocity at a small radius followed by a re-acceleration process back to a CJ detonation. The key mechanism is identified as the slowdown produced as soon as the sonic point reaches the exit of the reaction zone. Under this condition, the time delay of the nonlinear response of the front to the rarefaction-wave-induced decay increases significantly. Detonation fails if the decay rate is strong enough to prevent the sonic point to catch the exit of the reaction zone.
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Communication dans un congrès
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https://hal.archives-ouvertes.fr/hal-03661171
Contributeur : Raúl Hernández Sánchez Connectez-vous pour contacter le contributeur
Soumis le : vendredi 6 mai 2022 - 16:02:14
Dernière modification le : vendredi 10 juin 2022 - 03:35:30
Archivage à long terme le : : dimanche 7 août 2022 - 19:19:56

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  • HAL Id : hal-03661171, version 1

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Raúl Hernández Sánchez, Bruno Denet, Paul Clavin. Critical Dynamics of Direct Initiation of Spherical Detonations. 28th International Colloquium on the Dynamics of Explosions and Reactive Systems (ICDERS), Jun 2022, Naples, Italy. ⟨hal-03661171⟩

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