A Reliable Method for Predicting the Specific Impulse of Chemical Propellants

Frem, Dany

doi:10.5028/jatm.v10.945

Cited by 19 publications

(29 citation statements)

References 0 publications

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“…Q The Is values calculated using Eq. (1) are employed as reference values in the present work (Table 1), since they agree very well with those calculated by using ISPBKW code [3]…”

Section: Methodssupporting

confidence: 68%

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Specific Impulse and Absolute Chemical Hardness

Marinho¹,

Farias²

2020

Preprint

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The present work is dedicated to show that there are relationships between the absolute chemical hardness (η) of monopropellants and their specific impulse (Is). A total of sixteen monopropellants have been modelled and the absolute hardness obtained by quantum chemical calculations. The following equation was obtained: Is = 17.562 η + 125.551, providing specific impulse results in very good agreement with reference values.

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“…Q The Is values calculated using Eq. (1) are employed as reference values in the present work (Table 1), since they agree very well with those calculated by using ISPBKW code [3]…”

Section: Methodssupporting

confidence: 68%

“…The obtained and tested empirical equations were really reliable, providing results in very good agreement with literature data. The obtained equation[3] is: Is (Nsg -1 ) = (-4.459 + 121.81 Ng + 4.697 Q)1/2 (1)…”

mentioning

confidence: 99%

Specific Impulse and Absolute Chemical Hardness

Marinho¹,

Farias²

2020

Preprint

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“…The density FOX‐12 is

ρ = 1.755 \cdot 10^{3}

{normalk normalg / normalm}^{3}

[43]. The value of the thermal decomposition reaction effect of FOX‐12, according to published data, has a spread:

Q = 1.629

MJ/kg [43],

Q = 3.76

MJ/kg [44] and

Q = 2.83

MJ/kg [45]. For

Z

estimation, we assume that

Q = 3.76

MJ/kg [44].…”

Section: Resultsmentioning

confidence: 99%

“…The value of the thermal decomposition reaction effect of FOX‐12, according to published data, has a spread:

Q = 1.629

MJ/kg [43],

Q = 3.76

MJ/kg [44] and

Q = 2.83

MJ/kg [45]. For

Z

estimation, we assume that

Q = 3.76

MJ/kg [44]. Since the thermal conductivity coefficient of FOX‐12 is unknown to us, we assigned it the value

= 0.1 W / (m \cdot K)

.…”

Section: Resultsmentioning

confidence: 99%

Determination of the Critical Temperature of Self‐Ignition of Explosives from the Stability Analysis of the Thermal Conductivity Equation

Khaneft

2021

Propellants Explo Pyrotec

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The analysis of stability of the heat conductivity equation with exothermic reaction of zero order and volume‐averaged stationary temperature the criteria of thermal explosion of condensed explosive materials (EM) expressions were obtained for parallelepiped, cylinder of finite length and sphere. Estimations of kinetic parameters (frequency factor and thermal decomposition rate activation energy) of HMX and FOX‐12 were performed. The numerical solution of thermal conductivity equation for HMX and FOX‐12 in the form of cubes was done. A good agreement of the EM ignition criterion in the form of a cube with the available experimental results and numerical solutions of the thermal conductivity equation was obtained. We showed that accounting for the decomposition reaction in the thermal conductivity equation leads to a slight increase in the critical ignition temperature for HMX and FOX‐12.

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“…Taking into account its maximum importance, empirical equations have been derived to allow the calculation of Is based on the propellant´s chemical composition [3] The molecular hardness η and electronegativity  are defined from formal density functional theory. Electronegativity is formally defined as (∂E/∂N)V and hardness as ½(∂ 2 E/∂N 2 )V where E is the energy, N is the number of particles, and V is the potential due to the nuclei.…”

Section: Introductionmentioning

confidence: 99%