Investigation of the kinetics and the chemical reaction mechanism in the flame of a mixed compound, based on ammonium perchlorate and polybutadiene rubber

Коробейничев, О. П.; Чернов, А. А.; Emel'yanov, I. D.; Ermolin, N. E.; Trofimycheva, T. V.

doi:10.1007/bf00751367

Cited by 16 publications

(10 citation statements)

References 15 publications

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“…It consists of 44 chemical species participating in 157 reaction steps and is a modified form of the smaller AP/CTPB (carboxy-terminated polybutadiene) mechanism proposed by Korobeinichev et al [35] with additions from Korobeinichev et al [36], Ermolin [37], Wang et al [38], and GRI-Mech [39]. To facilitate faster calculations, the full AP/HTPB gas-phase kinetic mechanism was analyzed for species and reactions that might be removed without changing the calculated one-dimensional burning rate.…”

Section: F Kinetic Mechanismsmentioning

confidence: 99%

Diffusion Flame Calculations for Composite Propellants Using a Vorticity-Velocity Formulation

Gross

Beckstead

2009

Journal of Propulsion and Power

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A two-dimensional model has been developed to study the flame structure above composite propellants using a vorticity-velocity formulation of the transport equations. This formulation allows for a more stable, robust, accurate, and faster solution method compared with the compressible Navier-Stokes equations in the low Mach flow regime. The model includes mass and energy coupling between the condensed and gas phases. The condensed-phase model is based on previously reported one-dimensional models and includes distributed decomposition and multistepreaction kinetics. The model uses a detailed gas-phase kinetic mechanism consisting of 37 species and 127 reactions. The kinetic mechanism and species diffusion determine the flame structure of the system; no assumptions are made beforehand, aside from appropriate boundary conditions. Numerical studies have been performed to examine the flame structure above an ammonium-perchlorate/hydroxy-terminated-polybutadiene propellant. The predicted flame structure was found to be qualitatively similar to the Beckstead-Derr-Price model with both premixed and diffusion flames present. Results present significant insight into ammonium perchlorate's ability to control a propellant's burning rate and illustrate the importance of the primary diffusion flame in composite propellant combustion.Nomenclature c p = heat capacity, erg=g=K g = gravitational acceleration vector, cm=s 2 h = specific enthalpy, erg=g i = species index M = Mach number r = radial distance, cm r = radial direction T = temperature, K t = time, s v = velocity vector, cm=ŝ v = diffusion velocity, cm=s W = molecular mass, g=mol _ w = chemical production rate, g=cm 3 =s Y = mass fraction z = axial direction = thermal conductivity, erg=s=cm=K = viscosity, poise = density, g=cm 3 = dissipation function ! = vorticity vector, 1=s

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Section: F Kinetic Mechanismsmentioning

confidence: 99%

Diffusion Flame Calculations for Composite Propellants Using a Vorticity-Velocity Formulation

Gross

Beckstead

2009

Journal of Propulsion and Power

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“…NO 2 undergoes very fast decomposition at high temperatures, producing lower nitrogen oxides such as NO, and oxygen, which is one of the dominant oxidizing components in the hot gas phase, reacting with the hydrocarbon fuel products. Brill et al [52] and Korobeinichev [53] measured primarily the presence of C 2 H 2 , C 2 H 4 , and final products when an HTPB-only pyrolysis is observed. In the condensed phase, the HTPB large molecular weight (1200 g=mol) units break first into smaller units (580 g=mol), and in a second phase, the polymer splits into long chains of butadiene (C 4 H 6 ) units [36].…”

Section: Flame Heightmentioning

confidence: 99%

Modeling the Combustion of a Solid Fuel Containing a Liquid Oxidizer Droplet

Pelosi

Gany

2012

Journal of Propulsion and Power

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This work presents a physical model of the combustion behavior of a liquid oxidizer droplet with adjacent solid fuel. It is the first modeling attempt related to a proposed new potential class of liquid-oxidizer-enhanced solid propellants, where liquid oxidizer units/capsules are embedded in a solid fuel/propellant, revealing a theoretical specific impulse increase of up to 12%. A one-dimensional mathematical model is formulated, which describes the main characteristics of the microscale flamelet formed by a volatile (typically polymeric) fuel component and an adjacent endothermically evaporating oxidizer droplet. The model predicts fuel and oxidizer surface temperatures, fluxes, and flame height as functions of operating pressure and droplet size. The transient nature of the combustion process is emphasized, revealing a combustion cycle at the individual droplet scale, with pressure-dependent average burning rates typical to solid propellants.

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“…A detailed mechanism would offer insights for developing reduced mechanisms that are less complex than the 243-step reactions [9] but more effective than the threestep global reaction mechanisms involving symbolic species. Indeed, the use of actual species instead of symbolic species results in better transport of mass and heat in the gas phase.…”

Section: Introductionmentioning

confidence: 99%

“…Among the investigators pursuing detailed chemistry of the propellant gas phase flame, Korobeinichev et al [9,10] studied the gas flame structure, kinetics, and reaction mechanisms of AP and hydroxy-terminated polybutadiene (HTPB) binder mixed with fine AP. Detailed reaction mechanisms with 49 species and 243 reactions [9], and later a reduced mechanism of 35 species and 58 reactions [10] were reported to represent the complete gas phase flame structure.…”

Section: Introductionmentioning

confidence: 99%

“…Detailed reaction mechanisms with 49 species and 243 reactions [9], and later a reduced mechanism of 35 species and 58 reactions [10] were reported to represent the complete gas phase flame structure. Jeppson et al [11] reported a kinetic model that accounts for the combustion of the composite propellant in solid, condensed, and premixed gas phase.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Gas phase flame structure of solid propellant sandwiches with different reaction mechanisms

Gaduparthi

Pandey

Chakravarthy

2016

Combustion and Flame

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Investigation of the kinetics and the chemical reaction mechanism in the flame of a mixed compound, based on ammonium perchlorate and polybutadiene rubber

Cited by 16 publications

References 15 publications

Diffusion Flame Calculations for Composite Propellants Using a Vorticity-Velocity Formulation

Diffusion Flame Calculations for Composite Propellants Using a Vorticity-Velocity Formulation

Modeling the Combustion of a Solid Fuel Containing a Liquid Oxidizer Droplet

Gas phase flame structure of solid propellant sandwiches with different reaction mechanisms

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