Topic
Burn rate (chemistry)
About: Burn rate (chemistry) is a research topic. Over the lifetime, 847 publications have been published within this topic receiving 8908 citations. The topic is also known as: Burning rate.
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TL;DR: This study demonstrates that various quantifiable properties exist for the lead-based materials, and shows that of the set, only Pb and α-PbO can support the formation of a weakly bound layer of amorphous carbon, a key experimental observable in the burning of DBPs.
Abstract: Lead-based ballistic modifiers are additives in double base propellants (DBPs) which render the burn rate insensitive to changes in pressure within a defined pressure range, thus imparting greater control of combustion conditions. In-coming European legislation will soon ban the use of lead in propellant formulations, however, and few suitable candidate replacement materials are currently available. In an effort to understand better the unique properties offered by lead-based modifiers, we present a first-principles computational study on Pb, PbO, PbO2, SnO2 and Bi2O3, all of which have been investigated experimentally as ballistic modifier materials. Our study demonstrates that various quantifiable properties exist for the lead-based materials. Overall, they have narrower electronic band gaps, lower surface energies and lower surface work functions than the lead-free systems, indicating a greater propensity to form stable chemical surfaces with higher catalytic activity. We also show that of the set, only Pb and α-PbO can support the formation of a weakly bound layer of amorphous carbon, a key experimental observable in the burning of DBPs.
9 citations
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TL;DR: In this paper, an explosion characteristic study of hydrous bio-ethanol was carried out in a constant volume combustion chamber (CVCC), and the results showed that both the explosion pressure and maximum rate of pressure rise increased linearly with the initial pressure.
9 citations
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TL;DR: In this article, the effects of several liquid burning rate catalysts on rheological properties of composite rocket propellants on the basis of hydroxy-terminated polybutadiene as a binder and ammonium perchlorate as an oxidizer have been examined.
Abstract: Effects of several liquid burning rate catalysts on rheological properties of composite rocket propellants on the basis of hydroxy-terminated polybutadiene as a binder and ammonium perchlorate as an oxidizer have been examined. Theoretical explanation of the observed effects of liquid catalysts on certain rheological properties of the mentioned propellants are given. Laboratory procedures for synthesis of used catalysts are described. The results of physico-chemical characterization of synthesized catalyst are also presented.
9 citations
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TL;DR: In this article, a solid composite, AN/HTPB-based propellant was prepared by conventional processing in a mechanical mixer and by applying an advanced processing technique relying on resonant acoustic mixing (RAM).
Abstract: In this comparative study, a solid composite, AN/HTPB-based propellant was prepared by conventional processing in a mechanical mixer and by applying an advanced processing technique relying on resonant acoustic mixing (RAM). After curing of the propellants, cross-sections were prepared and characterized by scanning electron microscopy. Also the density of the propellants was measured and finally the ballistic properties were measured using chimney burner tests. The experimental results clearly showed that the oxidizer particles, the homogeneity of the propellants, the density and the burn rate properties are hardly affected by the processing method. For the propellant studied in this research, resonant acoustic mixing is a very promising, advanced processing technique that can be applied as an alternative to the conventional mechanical mixing of this high solid load propellant composition. © 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
9 citations
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05 Nov 1965
TL;DR: In this paper, the ignition characteristics of five operational propellants and seven model systems of varying composition were investigated by the use of high flux radiant energy as the ignition stimulus, and the authors provided considerable information which relates ignition characteristics to compositional factors.
Abstract: : The ignition characteristics of five operational propellants and seven model systems of varying composition were investigated by the use of high flux radiant energy as the ignition stimulus. The study provided considerable information which relates ignition characteristics to compositional factors. Findings of particular importance are: (1) for the types of propellants studied, ignitability is directly related to burning rate; within each system, those factors which increase burning rate also ease ignition; (2) minimum pressure for ignition of ammonium perchlorate propellants appears to be primarily related to the nature of the binder.
9 citations