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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.


Papers
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Journal ArticleDOI
TL;DR: In this article, current stability criteria for longitudinal combustion instability were tested for generality using data from 54 different propellants including polyurethane and carboxyl-terminated polybutadiene binders, ammonium perchlorate, aluminum, and rate modifiers.
Abstract: : Current stability criteria for longitudinal combustion instability were tested for generality using data from 54 different propellants. These included formulations containing polyurethane and carboxyl-terminated polybutadiene binders, ammonium perchlorate, aluminum, and rate modifiers. The propellants were tested at 70F in 4- and 8-in. diam, tubularly-perforated motors which were pulsed to initiate the instability. It was found that for a particular propellant system, well-defined behavioral trends could be established as the formulation was varied. A considerable variability in such trends was observed, however, for grossly different propellant systems. Consequently, a generalized correlation of motor behavior with the details of propellant formulation was not achieved. Similarly, the stability criterion proposed by Capener, Dickinson, and Kier, which features a power law relation between a 'threshold' burning rate and the corresponding chamber pressure, was found to be invalid in the general case. (Author)

13 citations

Patent
05 Sep 1989
TL;DR: In this article, a method for deterred granular granular nitrocellulose propellant powder compositions having a stable burn rate gradient was proposed, which consisted of coating granules with a minor amount by weight of a polycaprolactone polymer which is soluble in the granules under conditions which cause the polymer to be gradually dissolved into granules to produce maximum burn deterrence at the surface of the granule which gradually decreases inwardly therefrom.
Abstract: Method for producing novel deterred granular nitrocellulose propellant powder compositions having a stable burn rate gradient. The invention comprises coating nitrocellulose propellant granules with a minor amount by weight of a polycaprolactone polymer which is soluble in nitrocellulose under conditions which cause the polymer to be gradually dissolved into the granules to produce maximum burn deterrence at the surface of the granules which gradually decreases inwardly therefrom to produce a desired burn rate gradient in the granules.

12 citations

Journal ArticleDOI
TL;DR: In this article, a simplified model for the combustion process in partially confined vessels is proposed to establish the burning rate based on the experimental data reported by Hochst and Leuckel (1998).
Abstract: This paper analyses the experimental data reported by Hochst and Leuckel (1998) for combustion in partially confined vessels and uses the data from these experiments to establish the burning rate based on a simplified model for the combustion process in such vessels. The model establishes three fundamental parameters which are necessary in characterizing the combustion process. These are: i) the burning rate, ii) the fraction of vent area occupied by burnt gas (or discharge sub-model), and iii) the vent area model (if cover mechanisms with variable vent areas are utilized). A set of independent equations is derived to determine the burning rate according to conservation of mass and volume for each gas fraction separately along with a general equation based on general volume conservation. Using this method we are able to describe the combustion process and examine the effect of various discharge models. The advantages of the model presented here include rapid applicability and a valuable analysis to derive mass burn rate and other useful parameters using experimental data from vented explosions with reasonable residual reactant values. Based on these results, the correct interpretation of the obtained burning rate can be used in order to explain the correct prediction of flame velocity and position according to a reasonable discharge model. The paper also evaluates the suitability of several discharge models for phenomenological models of vented explosions. The most appropriate is a Heaviside step function which considers that only unburnt gas is initially expelled, with that component decreasing and the burnt gas component increasing until finally only burnt gas is expelled. The obtained results in this study can be used to predict the burning rate behavior and the combustion process of similar problems.

12 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202310
202220
202116
202015
201918
201811