Simulating the Combustion of N Powder with Added Finely Divided Aluminum

This paper presents a physico-mathematical combustion model of the metallized composite solid propellant (MCSP), which takes into account the chemical reactions in the condensed and gas phases. The model describes convection and diffusion of the propellant components in the two-phase flow over the fuel surface and combustion of the aluminium particles emitted from the fuel. The constructed model provides the opportunity to calculate the fuel combustion rate under the constant and variable pressure. The obtained calculation results of the MCSP combustion rate using the model are in good agreement with the known experimental data. The manuscript also provides data on the modelling of the MCSP extinction under the sudden pressure change. According to the conducted numerical simulations, the value of the pressure drop, leading to the fuel extinction, depends on the mass fraction of the aluminium powder in the fuel composition and its dispersion. With an increase in the mass fraction of the aluminium powder and/or a decrease in the size of the aluminium particles emitting from the fuel surface, the extinction process occurs at a greater value and under a higher rate of the pressure drop. The numerical simulation has also shown that the addition of the aluminium powder to the composition of the propellant increases the combustion stability under the sudden drop in pressure over the combustion surface.

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“…The mass of the aluminium particles changes during its combustion. The mass‐change rate obtained in [16] and has the following form:

true G = \frac{3 μ_{O}}{2 μ_{A l}} n_{3} ρ_{k} 4 π k_{A l} a^{0.9} r_{A l}^{1.5}, k_{A l} = 2.22 \cdot 10^{- 5} m^{1.5} (/) s

…”

Section: Methodsmentioning

confidence: 99%

“…The mass of the aluminium particles changes during its combustion. The mass-change rate obtained in [16] and has the following form:…”

Section: Formulation Of the Combustion Modelmentioning

confidence: 99%

Mathematical Modelling on Extinction of Metallized Composite Solid Propellant Under a Sudden Drop in Pressure

Krainov

Poryazov

Krainov

2021

Propellants Explo Pyrotec

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“…To model the burning out of aluminum particles in a flow of powder combustion products, we used the experimental results [1] showing that under pressures above 20 atm the rate of aluminum particle combustion in an oxidant flow do not depends on pressure, ignition of an aluminum particle occurs when it reaches a certain temperature. Mathematical model of solid propellant combustion with micron-sized aluminum under the acceleration forces is based on [2,3].…”

Section: Mathematical Modelmentioning

confidence: 99%

“…(8) is the ideal gas law. The calculations of the N powder combustion were carried out under the following values of the thermophysical and kinetic parameters from [3].…”

Section: Mathematical Modelmentioning

confidence: 99%

Combustion of solid propellant with micron-sized Aluminium under the acceleration force

Poryazov

Krainov²

2017

MATEC Web Conf.

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Abstract. The paper presents a physical-mathematical model for metallized solid propellant combustion under acceleration directed along the normal to the burning surface. The model takes into account the thermal effect of decomposition of the condensed phase, convection, diffusion, the exothermic chemical reaction in the gas phase, heating and combustion of Al particles in the gas flow, the flow of combustion products, the particle velocity lag relative to the gas and the field effect of acceleration on the motion of Al particles. The effect of the Al particle size and mass fraction, emitted from the burning surface, on the burning rate is also taken into consideration. The impact of the Al particle size, emitted from the burning surface, on the linear burning rate has been investigated under acceleration. The study results showed that with increasing acceleration the burning rate increased. It was also revealed that the larger was the size of aluminum particles emitted from the burning surface, the higher was the response of the burning rate to acceleration. The results showed that increasing the mass fraction of aluminum in the propellant composition led to an increase in the response of the relative burning rate. It was also found that the relative burning rate sensitivity increased with pressure above the burning surface. The results obtained are in a qualitative agreement with those described in the scientific literature. Mathematical modelThe paper presents a physical-mathematical model for metallized solid propellant combustion under acceleration directed along the normal to the burning surface. The model takes into account the thermal effect of decomposition of the condensed phase, convection, diffusion, the exothermic chemical reaction in the gas phase, heating and combustion of Al particles in the gas flow, the flow of combustion products, and the particle velocity lag relative to the gas and acceleration forces. To model the burning out of aluminum particles in a flow of powder combustion products, we used the experimental results [1] showing that under pressures above 20 atm the rate of aluminum particle combustion in an oxidant flow do not depends on pressure, ignition of an aluminum particle occurs when it reaches a

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“…1-8) with the initial and boundary conditions (Eqs. 9-15) and the relations for the right-hand terms was solved numerically using the procedure described in [6].…”

Section: Numerical Analysismentioning

confidence: 99%

Burning Rate Calculation for a Frozen Nanosized Aluminum Suspension

Poryazov

Moiseeva

Krainov

2016

KEM

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The paper presents a mathematical model for combustion of a frozen nanosized aluminum suspension (ALICE), taking into account the combustion of aluminum in water vapor, the motion of combustion products, and the velocity lag of particles compared to gas. The model was formulated based on Belyaev’s approach to modeling the combustion of volatile fuels [1]. The burning rate calculated is in agreement with the experimental data on the ALICE burning rate and its variation with pressure.

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Simulating the Combustion of N Powder with Added Finely Divided Aluminum

Cited by 12 publications

References 1 publication

Mathematical Modelling on Extinction of Metallized Composite Solid Propellant Under a Sudden Drop in Pressure

Mathematical Modelling on Extinction of Metallized Composite Solid Propellant Under a Sudden Drop in Pressure

Combustion of solid propellant with micron-sized Aluminium under the acceleration force

Burning Rate Calculation for a Frozen Nanosized Aluminum Suspension

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