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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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OtherDOI
27 Jan 2023
TL;DR: In this paper , the importance of visually observing the combustion process is used to explain slope breaks that appear in the pressure-dependent burning rates of liquid propellants, which are not predicted by current models.
Abstract: Pressure plays a significant role in determining the burning rate of a propellant. Experimental measurements of burning rates are essential for quantifying their magnitudes and defining their functional behavior with pressure, as predictive capabilities from theory and modeling are still not sufficient. Performing measurements over a wide range of conditions including extreme conditions and visually observing the combustion process are beneficial to the fundamental understanding of anomalies in burning rate behavior and to the development of models. There are various methods to measure burning rates, but visual observations have rarely been made above 7 MPa. In this chapter, high-pressure visually aided experiments and burning rate measurements of liquid and solid propellants are discussed and reviewed. The importance of visually observing the combustion process is used to explain slope breaks that appear in the pressure-dependent burning rates of liquid propellants, which are not predicted by current models. The reasons for these breaks can be due to physical and chemical phenomena, and in many cases, the measurements are not representative of fundamental intrinsic rates.
Proceedings ArticleDOI
07 Dec 2016
TL;DR: In this article, the combustion of composite solid propellants was investigated and an available numerical model was improved for taking into account the change of pressure, when the process occurs in a confined environment, as inside a rocket.
Abstract: The combustion of composite solid propellants was investigated and an available numerical model was improved for taking into account the change of pressure, when the process occurs in a confined environment, as inside a rocket. The pressure increase upon ignition is correctly described by the improved model for both sandwich and dispersed particles propellants. In the latter case, self-induced fluctuations in the pressure and in all other computed variables occur, as consequence of the periodic rise and depletion of oxidizer particles from the binder matrix. The comparison with the results of the constant pressure model shows a different fluctuating profile of gas velocity, with a possible second order effect induced by the pressure fluctuations.
Journal ArticleDOI
TL;DR: An extension to the dynamic thickened flame model for large-eddy simulations (DTFLES) is presented, which allows modeling highly stratified combustion and accounts for spatial variations of flow and combustion metrics.
Dissertation
29 Mar 2011
TL;DR: In this paper, the authors describe a Spark Ignition Engine Pre-Mixed Flame Development (SFI) and derive the Mass Fraction Burn Rate (MFR) from the P-V diagram.
Abstract: .................................................................................................................................... ii Acknowledgements .................................................................................................................. iii List of Tables ........................................................................................................................... vi List of Figures ......................................................................................................................... vii List of Abbreviations .................................................................................................................x Chapter 1: Background ..............................................................................................................1 Chapter 2: Working Principles of the System............................................................................5 2.1 Spark Ignition Engine Pre-Mixed Flame Development ...................................................5 2.2 Calculating Performance and Efficiency Indicators from the P-V Diagram ...................6 2.3 Quantifying Combustion Variability ...............................................................................8 Chapter 3: Modeling Techniques and Equations .....................................................................10 3.1 Combustion Modeling Approaches ...............................................................................10 3.2 Derivation of the Mass Fraction Burn Rate ...................................................................13 Chapter 4: Instrumentation & Programming ...........................................................................20 4.1 Piezoelectric Pressure Sensors .......................................................................................20 4.2 Incremental Angular Encoders ......................................................................................27 4.3 Data Acquisition ............................................................................................................28 4.4 Data Integrity and Analysis ...........................................................................................30 Chapter 5: Component Machining & Dynamometer Setup .....................................................34
Patent
29 Sep 2020
TL;DR: In this article, a method for estimating a peak cylinder pressure associated with operation of an internal combustion engine may include receiving, in a cylinder combustion model, a fuel signal and an air signal.
Abstract: A method for estimating a peak cylinder pressure associated with operation of an internal combustion engine may include receiving, in a cylinder combustion model, a fuel signal and an air signal. The cylinder combustion model may be configured to estimate at a first crankshaft angle, a first mass fuel burn rate and a first burned fuel-air ratio associated with combustion. The cylinder combustion model may also be configured to estimate at a second crankshaft angle, a combustion ignition delay associated with the combustion, and estimate at the second crankshaft angle, a start of combustion associated with the combustion of the fuel and the air supplied to the cylinder. The cylinder combustion model may be further configured to estimate, based at least in part on the start of combustion, a peak cylinder pressure associated with the combustion of the fuel and the air supplied to the cylinder.

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