Inscrição na biblioteca: Guest
Portal Digital Begell Biblioteca digital da Begell eBooks Diários Referências e Anais Coleções de pesquisa
International Journal of Energetic Materials and Chemical Propulsion
ESCI SJR: 0.142 SNIP: 0.16 CiteScore™: 0.29

ISSN Imprimir: 2150-766X
ISSN On-line: 2150-7678

International Journal of Energetic Materials and Chemical Propulsion

DOI: 10.1615/IntJEnergeticMaterialsChemProp.v4.i1-6.640
pages 679-692

New Insights into the Combustion of AP/HTPB Rocket Propellents: The Catalyst Active Sites and a Combustion Flame Model for The Ferrocene-Catalysed Combustion

T. T. Nguyen
Weapons Systems Division, Defence Science & Technology Organisation (DSTO) P.O. Box 1500 Salisbury, South Australia 5108, Australia

RESUMO

The combustion of solid rocket propellants consisting of hydroxy-terminated polybutadiene (HTPB) as binder and ammonium perchlorate (AP) as oxidiser and incorporating the ferrocenic burn rate catalysts Catocene and Butacene was examined with a view to: (i) obtaining a better understanding of the propellant combustion behaviour and the prevailing mechanistic sites of burn rate catalysis, and (ii) determining the burn rate temperature sensitivity.
Examination revealed that the enhancing effect of 1% Catocene was equivalent to 0.5% Butacene. The combined experimental evidence (from burn rate measurements and scanning electron microscopy) provides insights into the possible sites of the catalytic action by the ferrocenic catalyst. The data were interpreted as indicating the catalyst acting predominantly in the binder, possibly to promote AP/binder reactions at the AP/binder interface, or to enhance the binder pyrolysis. There could be, possibly to a much less extent, active sites formed by iron particles ejected into the primary diffusion flame. There was no evidence suggesting the catalyst acting in the oxidiser to promote surface AP decomposition. The arguments support the logic that the combustion is controlled by the primary diffusion flame. A combustion flame model is proposed which shows the domed AP surface particle, undercutting along the AP particle boundary, and the primary diffusion flame bending across the AP/binder interface.
The burn rate temperature sensitivity value (σp) at 10 MPa for the propellants containing 0.5% Catocene and 0.5% Butacene was 0.17 and 0.15%/°C, respectively. This represents a reduction of 40% and 35%, from the baseline non-catalyst value. The lowering of bum rate temperature sensitivity re-affirms the contention that a primary diffusion flame mechanism is operative for the ferrocene-catalysed combustion.


Articles with similar content:

COMBUSTION BEHAVIORS AND MECHANISM OF AP-BASED COMPOSITIONS WITH NITROESTER BINDERS
International Journal of Energetic Materials and Chemical Propulsion, Vol.14, 2015, issue 5
Valery V. Serushkin, Valery P. Sinditskii, Sergey A. Filatov, Anton N. Chernyi
ON CHEMICAL KINETICS OF THE IGNITION OF AP / NSAN / INERT BINDER COMPOSITE PROPELLANTS
International Journal of Energetic Materials and Chemical Propulsion, Vol.4, 1997, issue 1-6
Octavia Frota, Luis Araujo
SURFACE HEAT RELEASE OF HTPB-BASED FUELS IN OXYGEN RICH ENVIRONMENTS
International Journal of Energetic Materials and Chemical Propulsion, Vol.5, 2002, issue 1-6
H. Stephen Jones, Grant A. Risha, George C. Harting, Joseph P. Arves, Arie Peretz, Donald E. Koch
RADIATIVE IGNITION OF SOLID PROPELLANTS: A PRACTICAL APPROACH
International Journal of Energetic Materials and Chemical Propulsion, Vol.9, 2010, issue 4
Franck Cauty, Yves Fabignon, Charles Erades
THEORETICAL MODELING OF ELECTRICALLY OPERATED AMMONIUM NITRATE PROPELLANT COMBUSTION
International Journal of Energetic Materials and Chemical Propulsion, Vol.18, 2019, issue 1
Dan Grinstein, Alon Gany, Inna Zamir, Moshe Ben-Reuven