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Babuk, V. A.; Dolotkazin, I. N.; Свиридов, В. В.

doi:10.1023/a:1022917201681

Cited by 25 publications

(3 citation statements)

References 11 publications

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“…There are usually two fractions of particle sizes and properties present in CCPs, i.e., fine alumina (FA) and agglomerates. The production of FA results from a variety of processes, including the condensation of aluminum gas-phase (vapor-phase) combustion products, the condensation of gas-phase combustion products of unagglomerated metal particles, and the heterogeneous combustion of unagglomerated metal particles [15]. In contrast, large CCPs are produced by the combustion residuals of agglomerates.…”

Section: Analytical Model For Ccp Size Predictionmentioning

confidence: 99%

“…Grigorev's mathematical model can be utilized to calculate some relevant pocket data, including the size distribution function and the parameters of the agglomerates formed by the pocket. As for the model of Babuk [15], the "pocket" and "inter pocket" mechanisms of agglomeration are considered, as well as how the separation of agglomerating metal particles on the burning surface affects the size of agglomerates. A difference of less than 15% was found between the model calculation and the experimental results.…”

Section: Introductionmentioning

confidence: 99%

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Agglomerate Size Evolution in Solid Propellant Combustion under High Pressure

Yue

Liu

et al. 2023

Aerospace

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Solid propellant combustion and flow are significantly affected by condensed combustion products (CCPs) in solid rocket motors. A new aluminum agglomeration model is established using the discrete element method, considering the burning rate and formulation of the propellant. Combining the aluminum combustion and alumina deposition model, an analytical model of the evolution of CCPs is proposed, capable of predicting the particle-size distribution of completely burned CCPs. The CCPs near and away from the propellant burning surface are collected by a special quench vessel under 6~10 MPa, to verify the applicability of the CCP evolution model. Experimental results show that the predicted error of the proposed CCP evolution model is less than 8.5%. Results are expected to help develop better analytical tools for the combustion of solid propellants and solid rocket motors.

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Section: Analytical Model For Ccp Size Predictionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Agglomerate Size Evolution in Solid Propellant Combustion under High Pressure

Yue

Liu

et al. 2023

Aerospace

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“…Alternatively, the addition of high active metal additives is an effective way to improve the properties of EMs . Research shows that EMs with high active metal additives have higher detonation and combustion properties. − Commonly used high active metal additives include aluminum, magnesium, boron, and so forth. However, some studies have found that metal hydrides can replace metals as better additives to mix with EMs. , Compared with metal power, metal hydrides possess high hydrogen storage capacity and higher combustion heat.…”

Section: Introductionmentioning

confidence: 99%

Thermal Decomposition Mechanism of 1,3,5,7-Tetranitro-1,3,5,7-tetrazocane Accelerated by Nano-Aluminum Hydride (AlH₃): ReaxFF-Lg Molecular Dynamics Simulation

Zhao

Mei

Zhao³

et al. 2020

ACS Omega

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ReaxFF-low-gradient reactive force field with CHONAl parameters is used to simulate thermal decomposition of 1,3,5,7-tetranitro-1,3,5,7-tetrazocane (HMX) and AlH 3 composite. Perfect AlH 3 and surface-passivated AlH 3 particles were constructed to mix with HMX. The simulation results indicate HMX is adsorbed on the surface of particles to form O–Al and N–Al bonds. The decomposition of HMX and AlH 3 composite is an exothermic reaction without energy barrier, but the decomposition of pure HMX needs to overcome the energy barrier of 133.57 kcal/mol. Active nano-AlH 3 causes HMX to decompose rapidly at low temperature, and the primary decomposition pathway is the rupture of N–O and C–N bonds. Adiabatic simulation shows that the energy release and temperature increase of HMX/AlH 3 is much larger than those of the HMX system. Surface-passivated AlH 3 particles only affect the initial decomposition rate of HMX. In HMX and AlH 3 composites, the strong attraction of Al in AlH 3 to O and the activation of the intermediate reaction by H 2 cause HMX to decompose rapidly. The final decomposition products of pure HMX are H 2 O, N 2 , and CO 2 , and those of HMX/AlH 3 are H 2 O, N 2 , and Al-containing clusters dominated by C–Al. The final gas production shows that the specific impulse of HMX/AlH 3 is larger than that of HMX.

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A Stochastic Pocket Model for Aluminum Agglomeration in Solid Propellants

Gallier¹

2009

Propellants Explo Pyrotec

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A new model is derived to estimate the size and fraction of aluminum agglomerates at the surface of a burning propellant. The basic idea relies on well‐known pocket models in which aluminum is supposed to aggregate and melt within pocket volumes imposed by largest oxidizer particles. The proposed model essentially relaxes simple assumptions of previous pocket models on propellant structure by accounting for an actual microstructure obtained by packing. The use of statistical tools from stochastic geometry enables to determine a statistical pocket size volume and hence agglomerate diameter and agglomeration fraction. Application to several AP/Al propellants gives encouraging results that are shown to be superior to former pocket models.

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Cited by 25 publications

References 11 publications

Agglomerate Size Evolution in Solid Propellant Combustion under High Pressure

Agglomerate Size Evolution in Solid Propellant Combustion under High Pressure

Thermal Decomposition Mechanism of 1,3,5,7-Tetranitro-1,3,5,7-tetrazocane Accelerated by Nano-Aluminum Hydride (AlH₃): ReaxFF-Lg Molecular Dynamics Simulation

A Stochastic Pocket Model for Aluminum Agglomeration in Solid Propellants

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Untitled

Cited by 25 publications

References 11 publications

Agglomerate Size Evolution in Solid Propellant Combustion under High Pressure

Agglomerate Size Evolution in Solid Propellant Combustion under High Pressure

Thermal Decomposition Mechanism of 1,3,5,7-Tetranitro-1,3,5,7-tetrazocane Accelerated by Nano-Aluminum Hydride (AlH3): ReaxFF-Lg Molecular Dynamics Simulation

A Stochastic Pocket Model for Aluminum Agglomeration in Solid Propellants

Contact Info

Product

Resources

About

Thermal Decomposition Mechanism of 1,3,5,7-Tetranitro-1,3,5,7-tetrazocane Accelerated by Nano-Aluminum Hydride (AlH₃): ReaxFF-Lg Molecular Dynamics Simulation