Randomly packed heterogeneous propellants and the flames they support

Buckmaster, J.; Jackson, T. L.; Hegab, A.; Kochevets, S.; Ulrich, M.

doi:10.2514/6.2001-337

Cited by 5 publications

(4 citation statements)

References 8 publications

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“…HTPB). A model of solid propellants can be constructed by assuming that the particles are spheres or discs and distributed in a random manner [22]. In order to characterize the packs of propellants and to match the size distribution and volume fraction of actual propellants, a packing algorithm is developed which is based on the work of Knott's group [23].…”

Section: Packing Algorithmmentioning

confidence: 99%

Multiscale modeling of heterogeneous propellants from particle packing to grain failure using a surface-based cohesive approach

Sun

Zhang

2012

Acta Mech Sin

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In the present work, a computational framework is established for multiscale modeling and analysis of solid propellants. A packing algorithm, considering the ammonium perchlorate (AP) and aluminum (Al) particles as spheres or discs is developed to match the size distribution and volume fraction of solid propellants. A homogenization theory is employed to compute the mean stress and strain of a representative volume element (RVE). Using the mean results, a suitable size of RVE is decided. Without considering the interfaces between particles and matrix, several numerical simulations of the relaxation of propellants are performed. The relaxation effect and the nonlinear mechanical behavior of propellants which are dependent on the applied loads are discussed. A new technology named surface-based cohesive behavior is proposed to describe the phenomenon of particle dewetting consisting of two ingredients: a damage initiation criterion and a damage evolution law. Several examples considering contact damage behavior are computed and also nonlinear behavior caused by damaged interfaces is discussed in this paper. Furthermore the effects of the critical contact stress, initial contact stiffness and contact failure distance on the damaged interface model have been studied.

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Section: Packing Algorithmmentioning

confidence: 99%

Multiscale modeling of heterogeneous propellants from particle packing to grain failure using a surface-based cohesive approach

Sun

Zhang

2012

Acta Mech Sin

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“…[20], and Buckmaster, et.al. [21,22] in order to numerically construct models of heterogeneous rocket propellants. Their packing algorithms are based on the integration of the random packing approach and the collision theory that has been described in a number of papers by Lubachevsky and his Colleagues in 1990,1991 [23] and by Zhang et.al.…”

Section: The Physical Modelsmentioning

confidence: 99%

Effect of Ammonium Perchlorate Grain Size on Combustion of a Selected Composite Solid Propellant

Hegab

Balabel

2007

International Conference on Aerospace Sciences and Aviation Tec

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The heterogeneous propellants consisting of Ammonium Perchlorate (AP) particles imbedded in a Hydroxyl Terminated Polybutadience (HTPB) are widely used in solid rocket industries. In this study, the effect of AP particles diameter and the random distribution with the HTPB on the burning of such propellant is presented. A mathematical model which describes the unsteady burning of a heterogeneous propellant by simultaneously solving the combustion fields in the gas phase and the thermal field in the solid phase with appropriate jump condition across the gas/solid interface is developed. The gas-phase kinetics is represented by a two-step reaction mechanism for the primary premixed flame and the primary diffusion flame between the decomposition products of the HTPB and the oxidizer AP. The propagation of the unsteady non-planer regression surface is described, using the Essentially-Non-Oscillatory (ENO) scheme with the aid of the level set strategy. The results show that the large AP particle diameter has a marked effect on the combustion surface deformation and on the burning rate as well. Therefore, modeling of the condensed phase process is mostly conducted on AP. Moreover, the effect of various parameters on the surface propagation speed, flame structure, and the burning surface geometry is obtained.

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“…[57], Buckmaster,et.al. [58,59], and Hegab et.al. [60] developed a random packing algorithm in order to numerically construct models of heterogeneous rocket propellants.…”

Section: Packing Models For Rocket Propellantsmentioning

confidence: 99%

An Overview of Solid Propellant Combustion Modeling

Hegab

2007

International Conference on Aerospace Sciences and Aviation Tec

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An overview of theoretical and experimental work concerning the burning process in rocket propellant is presented. The current study has emphasized Ammonium Perchlorate (AP) / Hydroxyl Terminated Poly-Butadiance, (HTPB) composites rocket propellant. These propellants are widely used in a variety of rocket systems ranging from small tactical missiles to the large boosters that propel the space shuttle into orbit. A detailed review for the chemical kinetics, numerical and experimental models for the burning of the monomodal, bimodal, and multimodal propellants is introduced. Effects of propellant compositions, time-dependent pressure fluctuations, temperature, fuel-binder types, on the burning rate are reviewed and discussed. The result of the current study shows the effect of pressure and the AP particle sizes on the burning rate, the complex flame structure, and the morphology of the combustion surface.

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Randomly packed heterogeneous propellants and the flames they support

Cited by 5 publications

References 8 publications

Multiscale modeling of heterogeneous propellants from particle packing to grain failure using a surface-based cohesive approach

Multiscale modeling of heterogeneous propellants from particle packing to grain failure using a surface-based cohesive approach

Effect of Ammonium Perchlorate Grain Size on Combustion of a Selected Composite Solid Propellant

An Overview of Solid Propellant Combustion Modeling

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