Optimization of a pyrotechnic igniter with the release of reactive particles

Saurel, Richard; Loraud, J. C.; Larini, M.

doi:10.1007/bf01414907

Cited by 10 publications

(1 citation statement)

References 10 publications

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“…This method has the advantage of capturing very efficiently all discontinuities: shocks, contact surfaces. We shall not dwell upon a detailed description of the method, which has been widely used in applications involving perfect gases (Saito and Glass 1984;Saurel et al 1991). For a clear and detailed presentation of the "RCM", the reader is particularily recalled to Gottlieb (1986) course.…”

Section: General Remarks and Complementsmentioning

confidence: 99%

An exact Riemann solver for detonation products

1992

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Abstract. Numerical methods based upon the Riemann Problem are considered for solving the general initial-value problem for the Euler equations applied to real gases. Most of such methods use an approximate solution of the Riemann problem when real gases are involved. These approximate Riemann solvers do not yield always a good resolution of the flow field, espe~zially for contact surfaces and expansion waves. Moreover, approximate Riemann solvers cannot produce exact solutions for the boundary points. In order to overcome these shortcomings, an exact solution of the Riemann problem is developed, valid for real gases. The method is applied to detonation products obeying a 5th order virial equatioa of state, in the shock-tube test case. Comparisons betwe,~n our solver, as implemented in Randorn Choice Method, and finite difference methods, which do not employ a Riemann solver, are given.

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Section: General Remarks and Complementsmentioning

confidence: 99%

An exact Riemann solver for detonation products

1992

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A finite volume scheme for two‐phase compressible flows

Saurel

Forestier²,

Veyret

et al. 1994

Numerical Methods in Fluids

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SUMMARYIn gas-particle two-phase flows, when the concentration of the dispersed phase is low, certain assumptions may be made which simplify considerably the equations one has to solve. The gas and particle flows are then linked only via the interaction terms. One may therefore uncouple the full system of equations into two subsystems: one for the gas phase, whose homogeneous part reduces to the Euler equations; and a second system for the particle motion, whose homogeneous part is a degenerate hyperbolic system. The equations governing the gas phase flow may be solved using a high-resolution scheme, while the equations describing the motion of the dispersed phase are treated by a donor-cell method using the solution of a particular Riemann problem. Coupling is then achieved via the right-hand-side terms. To illustrate the capabilities of the proposed method, results are presented for a case specially chosen from among the most difficult to handle, since it involves certain geometrical difficulties, the treatment of regions in which particles are absent and the capturing of particle fronts.

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Ignition and growth of a detonation by a high energy plasma

1992

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Abstract. Many experimental and numerical studies have been achieved to describe the transition process of deflagration to detonation when a projectile impacts an explosive. Also a large work has been done for the determination of various parameters -such as the impact pressure, the efficiency factors, etc. of the laser -material interaction. When a laser beam impacts an explosive, the p2~. criterion, characteristic of shock initiated detonations, is no longer valid due to the generated hot plasma whose effect is to decrease the DDT (Deflagration to Detonation Transition) duration. The present paper deals with a modelling of the plasmaexplosive medium allowing the determination of distances and times of the DDT process. The two phase modelling of the granular explosive takes into account the creation of hot spots. The pressure of the plasma is computed using a semi empirical model, while the temperature is obtained from Maxwell Boltzmann statistics. The authors focused their attention on the equation of state for the detonation products and the numerical process.

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Optimization of a pyrotechnic igniter with the release of reactive particles

Cited by 10 publications

References 10 publications

An exact Riemann solver for detonation products

An exact Riemann solver for detonation products

A finite volume scheme for two‐phase compressible flows

Ignition and growth of a detonation by a high energy plasma

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