scispace - formally typeset
Search or ask a question
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.


Papers
More filters
ReportDOI
01 Nov 1977
TL;DR: In this paper, a model of aluminum particle combustion in CO2 is presented, which incorporates measured kinetic data for the gas phase reaction of aluminum with CO2 rather than assuming a flame-sheet.
Abstract: : Augmentation of solid propellant burning rate often occurs in the presence of strong product gas flow across the burning surface: this phenomenon is referred to as erosive burning. Increasing use of motors with low port-to- throat area ratios (including nozzleless motors) is leading to increased occurrence and severity of erosive burning. A first generation model based upon bending of columnar diffusion flames by a crossflow, permitting prediction of the effect of high-velocity crossflow on the burning rate of a composite propellant given only the zero-crossflow burning rate characteristics, is briefly summarized and compared with data. A second generation model (still under development) which does not require even zero-crossflow burning rate data, using only composition and particle size as input, is outlined. In addition, a test device permitting extensive characterization of burning rate-pressure- crossflow velocity relationships for various propellants with direct continuous measurement of instantaneous burning rate by high-speed chematography is described, and results of a series of tests with seven propellants are presented. A model of aluminum particle combustion in CO2 which incorporates measured kinetic data for the gas phase reaction of aluminum with CO2 rather than assuming a flame-sheet (infinite gas-phase kinetics) as in past models has been developed, programmed and used to parametrically study the effect of various parameters on particle burning rate and burn-time. This model treats aluminum oxide condensation as occurring in an infinitesimally thin shell whose location is determined by specification of a condensation temperature.

3 citations

Proceedings ArticleDOI
02 Aug 2009
TL;DR: In this paper, the authors quantify the uncertainty of laboratory measurements of propellant burning rates from closed combustion bomb testing and present a Monte Carlo assessment of digital algorithms that propagate the uncertainties in the primary measurements throughout all the data analysis algorithms.
Abstract: Laboratory measurements of a new propellant formulation provide critical screening of ballistic properties. The objective of this work is to quantify the uncertainty of laboratory measurements of propellant burning rates. The scope includes uncertainty analyses of the measured propellant burning rate from closed combustion bomb testing. The scope includes a Monte Carlo assessment of digital algorithms that propagate the uncertainties in the primary measurements throughout all the data analysis algorithms. The results are presented parametrically in terms of these variables to show the sensitivity of their sensitivity on the measurements. The results reveal that the burning rate can be determined to within 4.28% to 5.73% depending on the burn rate determination method used.

3 citations

01 Jan 2002
TL;DR: Burn rate is one of the most fundamentally important properties of pyrotechnic materials as mentioned in this paper, and is measured as the distance the burning surface of a pyrotehnic composition advances inwardly (perpendicular to the surface) per unit time, and typically would be reported as inches per second (or mm/s).
Abstract: Burn rate is one of the most fundamentally important properties of pyrotechnic materials. While burn rate may be measured as a mass burn rate (mass of pyrotechnic composition consumed per unit time, e.g., g/s), linear burn rate is most commonly used. Linear burn rate can be defined as the distance the burning surface of a pyrotechnic composition advances inwardly (perpendicular to the burning surface) per unit time, and typically would be reported as inches per second (or mm/s). Even for a specific pyrotechnic material with a defined composition (including prescribed particle size and shape) there are a number of factors that will affect its burn rate. Generally the most important factors, ranked roughly in order of importance, are: ambient pressure, loading pressure (composition density), temperature, and burning surface area. Accordingly, for burn rate measurements to be most useful, they must take each of these additional factors into consideration.

3 citations

Patent
04 Jun 1990
TL;DR: In this paper, a bundle of optic fibers of different lengths are inserted through the case wall of a solid fuel or a hybrid rocket motor and extended through the wall of the fuel grain to the edge of the bore in center thereof.
Abstract: In one embodiment a bundle of optic fibers of different lengths are inserted through the case wall of a solid fuel or a hybrid rocket motor and extends through the wall of the fuel grain to the edge of the bore in center thereof As the grain burns in a normal manner, from the center toward the outer periphery of the case, the bright flame of ignition is seen at the end of the fiber optic fiber adjacent to the flame The length of each fiber in the bundle is used to determine the burn rate and amount of grain left to ignite In another embodiment different length fibers of a bundle are looped into the grain and back to the exterior of the case and light emitting diodes are positioned at one end of each fiber with a light-detecting means at the other end The light through the diodes is monitored to detect a no-light condition which exists when a fiber is destroyed by the burn In yet another embodiment a single optic fiber is used with a light source and a light reception means at one end As the end of the fiber is destroyed by the ignition of the grain, the time it takes the light from the light source to return to the light sensor is used to establish the burn rate and amount of remaining fuel grain at any given time during the burn

3 citations

ReportDOI
13 Jan 1965
TL;DR: In this article, the initiation of axial combustion instability in an experimental combustor, 40 inches long by 50 inches I.D., containing a radial burning grain, has been studied utilizing a wide variety of composite propellants.
Abstract: : Initiation of axial combustion instability in an experimental combustor, 40 inches long by 50 inches I.D., containing a radial burning grain, has been studied utilizing a wide variety of composite propellants. Where instability occurred, a correlation was found between the threshold pressure at which instability was first observed and propellant ballistic parameters, notably the linear burning rate. Fast burning propellants, containing either a catalyst or potassium perchlorate, did not sustain axial mode combustion instability. Transverse instability was observed for most non-aluminized propellants in pressure regimes where they were stable to axial combustion instability. An explanation of combustion stability criteria has been sought in terms of either mixing processes within a granular diffusion flame or a thermal explosion process. The granular diffusion flame concept appears thus far to be the more promising explanation; it predicts the stability trends observed in large solid propellant rocket motors.

3 citations


Network Information
Related Topics (5)
Combustion
172.3K papers, 1.9M citations
86% related
Internal combustion engine
130.5K papers, 1M citations
72% related
Heat transfer
181.7K papers, 2.9M citations
71% related
Reynolds number
68.4K papers, 1.6M citations
71% related
Laminar flow
56K papers, 1.2M citations
70% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202310
202220
202116
202015
201918
201811