Nonsteady burning of periodic sandwich propellants with complete coupling between the solid and gas phases

Hegab, A.; Jackson, T. L.; Buckmaster, J.; Stewart, D. Scott

doi:10.1016/s0010-2180(01)00226-7

Cited by 92 publications

(47 citation statements)

References 23 publications

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“…Indeed, experiments [16,17] performed in our laboratory have recently shown that the surface curvature affects local heat, mass and momentum transport, which in turn can have significant effect on the local burning rates for PMMA. Furthermore, Hegab et al [18] have recently obtained self-consistent solutions to describe buming of a sandwich propellant exposed to quiescent air and showed significant moving boundary effects on the buming rates. Therefore, our second objective is to make quantitative comparisons of the steady-state NS solutions, and Emmons solutions with our experimental measurements of regression rate distributions [16,17] at different bum times (5 to 20 min) to study the fransient effects and the validity of the approximations (flat surface and steady surface-pyrolysis).…”

mentioning

confidence: 99%

Pyrolysis and Boundary Layer Combustion of a Non-Charring Solid Plate Under Forced Flow

Ananth¹,

Tatem²,

Ndubizu³

2003

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Public reporting burden for this collection of Information Is estimated to average 1 hour per response, Including the time for reviewing Instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviev/Ing this collection of Information. Send comments regarding this burden estimate or any other aspect of this collection of information. Including suggestions for reducing this burden to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of Information if it does not display a currently valid OI^B control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. REPORT DATE (DD-MM-YYYY)My 31 PERFORMING ORGANIZATION REPORT NUMBERNRLMR/6180-03-8700 SPONSORING / MONITORING AGENCY NAME(S) AND ADDRESS(ES)Office of Naval Research 800 North Quincy Street Arlington, VA 22217 SPONSOR / MONITOR'S ACRONYM(S) SPONSOR / MONITOR'S REPORT NUMBER(S) DISTRIBUTION /AVAILABILITY STATEMENTApproved for public release; distribution is unlimited. SUPPLEMENTARY NOTES*Geo-Centers, Inc., Lanham, MD ABSTRACTSolutions of Navier-Stokes (NS) equations were obtained for burning rate Nu and temperature distributions for a flat PMMA plate using an iterative method to impose steady-state, pyrolysis kinetics at the surface. The NS solutions show that Nu depends on two parameters-Reynolds number (Re) and air velocity-unlike the classical solutions, which include the boundary layer approximations. The NS solutions are compared with experiments to show that the curvature and in-depth heat transfer/pyrolysis effects are significant within the pyrolysis zone at large and small bum times, respectively. SUBJECT TERMS

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mentioning

confidence: 99%

Pyrolysis and Boundary Layer Combustion of a Non-Charring Solid Plate Under Forced Flow

Ananth¹,

Tatem²,

Ndubizu³

2003

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“…If some SP components are not capable of selfsustaining combustion, the unsteady burning rate with the surface shape change taken into account can be approximately calculated following [95,97].…”

Section: Surface Shape Changementioning

confidence: 99%

Analysis of unsteady solid-propellant combustion models (review)

Gusachenko

Зарко

2008

Combust Explos Shock Waves

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Recent studies of solid-propellant combustion models are briefly analyzed. The models are divided into purely one-dimensional (classical and phenomenological models with various generalizations of the Zel'dovich approach) and non-one-dimensional. The latter include models with local non-one-dimensionality, which is always accompanied by local unsteadiness. This all can be eliminated by averaging. The main disadvantage of unsteady solid-propellant combustion models, which is no fault of their authors, is the same as in the case of steady-state models: the lack of detailed information on chemical and physical processes in the condensed phase. Impropriety of extending the purely one-dimensional approach to the instability region is noted. Possible directions for further development of unsteady (and quasi-steady-state) solid-propellant combustion models for homogeneous compositions may involve accounting for local non-one-dimensionality and the unsteadiness due to instability of the subsurface reactions zone and verification of the possibility of the existence of chemical instability capable of causing similar non-one-dimensionality and unsteadiness.

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“…Hegab et al [17] performed an unsteady computational analysis of the thermal and concentration fields in the gas phase coupled with the condensed phase through surface pyrolysis laws. A simplified kinetic approach was used in which the AP decomposition flame and the final flame of the BDP model [5] were utilized.…”

Section: Theoretical and Computational Studiesmentioning

confidence: 99%

“…A simplified kinetic approach was used in which the AP decomposition flame and the final flame of the BDP model [5] were utilized. The authors of [17] advocated the unimportance of the "primary diffusion flame." They stated that this position regarding the relative unimportance of the primary diffusion flame has long been argued, but citations were not listed.…”

Section: Theoretical and Computational Studiesmentioning

confidence: 99%

Laminate Propellant Combustion (Review) 2. Theoretical Investigations

Fitzgerald

Brewster

2006

Combust Explos Shock Waves

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A review of theoretical research of the combustion of laminate propellants is given. The purpose and description of the simplification of heterogeneous propellants through the use of constituent layers is detailed. This second of a two-part review describes: 1) the development of knowledge of the deflagration of laminates through analytical and computational descriptions of many different aspects of the overall problem; 2) the attempts to validate these theoretical descriptions by comparing their results with relevant experimental findings. While there is a wealth of two-dimensional experimental data available for validating theoretical models and an abundance of models developed, relatively little comparison has been done. As of yet, no model has made a convincing case for validation through sufficiently extensive comparisons to experimental data.

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Nonsteady burning of periodic sandwich propellants with complete coupling between the solid and gas phases

Cited by 92 publications

References 23 publications

Pyrolysis and Boundary Layer Combustion of a Non-Charring Solid Plate Under Forced Flow

Pyrolysis and Boundary Layer Combustion of a Non-Charring Solid Plate Under Forced Flow

Analysis of unsteady solid-propellant combustion models (review)

Laminate Propellant Combustion (Review) 2. Theoretical Investigations

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