Calculation of heterogeneous detonation initiation for a hydrogen-oxygen mixture in an explosion tube

Voronin, D. V.; Ждан, С. А.

doi:10.1007/bf00782401

Cited by 6 publications

(2 citation statements)

References 5 publications

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“…However, certain inconsistencies with the theoretical predictions remain not well elucidated: the problem of nonexistence of an unstable steady solution between the PGD1 and SFD1 branches has been already observed numerically in a close situation by Voronin (1984) for cryrogenic hydrogenoxygen mixtures. As for the fact that the maximum number of solutions found here is three instead of five, the most likely explanation lies in the restrictions caused by ignition criteria of particles and gases.…”

Section: Discussionmentioning

confidence: 93%

Structure and multiplicity of detonation regimes in heterogeneous hybrid mixtures

Veyssiere

Khasainov²

1995

Shock Waves

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Abstract. The problem of propagation of steady nonideal detonations in heterogeneous hybrid mixtures is studied in the case of a hydrogen-air gaseous mixture with suspended fine aluminum particles. Due to the difference in the order of magnitude of the characteristic induction and combustion times of gaseous mixture and solid particles, the process of energy release behind the leading shock front occurs over an extended period of time and in a nonmonotonic way. An approximate numerical model has been improved to find the steady propagation regimes and investigate their structure. The problem is analyzed in the frame of the theory of the mechanics of multiphase media with mass, momentum and heat exchanges between particles and gases. The one-dimensional ZND model of detonation with losses to the lateral boundaries is used. It is shown that three different steady propagation regimes may exist: the Pseudo-Gas Detonation (PGD), the Single-Front Detonation (SFD) and the Double-Front Detonation (DFD). The numerical results match the available experimental results obtained previously. The influence of the fundamental parameters of the system on the domains of existence of the different regimes is displayed. Moreover, it is shown that, according to the theory of nonideal detonations with nonmonotonic energy release, there may exist a multiplicity of detonation modes. However, the total number of solutions actually obtained by numerical calculations differs from that predicted by the theory. The reasons for these discrepancies are discussed.

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Section: Discussionmentioning

confidence: 93%

Structure and multiplicity of detonation regimes in heterogeneous hybrid mixtures

Veyssiere

Khasainov²

1995

Shock Waves

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“…They considered droplet radii ranging from 50 to 500 µm and found that the detonation velocity is inversely proportional to the width of the reaction zone behind the shock front. The work of S. A. Zhdan and D. V. Voronin [4,5] has focused on simulating the initiation of liquid-fueled detonations. They have considered initiation both using a condensed explosive and using gaseous detonation in a stoichiometric hydrogen-oxygen mixture.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Liquid-Fueled Detonations by an Eulerian–Lagrangian Model

Shen¹,

Wang

Liu³

et al. 2012

International Journal of Nonlinear Sciences and Numerical Simulation

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Abstract. In this paper, an Eulerian-Lagrangian twophase flow model for liquid-fueled detonations is constructed. The gaseous mixture is described by an Eulerian method, and liquid particles in gaseous mixture are traced by a Lagrangian method. An improved space-time conservation element and solution element (CE/SE) scheme is applied to the simulations of detonations in liquid C 10 H 22 -O 2 /air systems. Different fuel droplet sizes and equivalence ratios are considered in the present study. Interestingly, the numerical results show that liquid-fueled detonations have some difference with gaseous detonations. Especially, a deficit in the propagation velocity compared to the gaseous detonation velocity is observed in mixtures with lean fuel and larger droplet sizes, while an increase in the propagation velocity compared to the gaseous detonation velocity is observed in the mixtures with very rich fuel. The surprising phenomenon is analyzed and discussed with the aid of detailed numerical results. In addition, the formation and propagation of two-phase detonation waves are characterized by series of results and the influence of particle radii is also discussed. All numerical results show that the present model can describe the gas-particle two-phase system accurately, and can be applied to numerical simulations of liquid-fueled detonations.

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Spray Detonation

Zhang¹

2009

Shock Wave Science and Technology Reference Library

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Calculation of heterogeneous detonation initiation for a hydrogen-oxygen mixture in an explosion tube

Cited by 6 publications

References 5 publications

Structure and multiplicity of detonation regimes in heterogeneous hybrid mixtures

Structure and multiplicity of detonation regimes in heterogeneous hybrid mixtures

Numerical Simulation of Liquid-Fueled Detonations by an Eulerian–Lagrangian Model

Spray Detonation

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