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Author: J. H. Kent
Publisher:
ISBN:
Category :
Languages : en
Pages : 116
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Author: J. H. Kent
Publisher:
ISBN:
Category :
Languages : en
Pages : 116
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Author: S. M. Correa
Publisher:
ISBN:
Category :
Languages : en
Pages : 47
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Development of a fundamental understanding of turbulence-chemistry interactions remains one of the most important and challenging problems in turbulent reacting flows. This program couples laser based measurements and computer modeling of well-characterized laboratory-scale jet diffusion flames to study the effects of finite-rate chemistry and localized extinction in turbulent combustion. The long-range goal is to use this fundamental understanding for control of lean and high-altitude blow out in gas-turbine engines. The results of the first year of this program include: 1) improving the data base for CO/H2/N2 turbulent jet diffusion flames by analyzing direct measurements of CO2 concentrations from Strokes vibrational Raman intensities and by comparing two independent methods of determining temperatures from the Raman data; 2) testing of the stretched laminar flamelet concept in turbulent diffusion flames by comparison of instantaneous and conditionally averaged Raman measurements in turbulent H2 and CO/H2/N2 jet diffusion flame calculations and measurements; and 3) testing of a diffusion flame pilot for stabilization of turbulent jet flames at high Reynolds number.
Author: Norbert Peters
Publisher: Cambridge University Press
ISBN: 1139428063
Category : Science
Languages : en
Pages : 322
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Book Description
The combustion of fossil fuels remains a key technology for the foreseeable future. It is therefore important that we understand the mechanisms of combustion and, in particular, the role of turbulence within this process. Combustion always takes place within a turbulent flow field for two reasons: turbulence increases the mixing process and enhances combustion, but at the same time combustion releases heat which generates flow instability through buoyancy, thus enhancing the transition to turbulence. The four chapters of this book present a thorough introduction to the field of turbulent combustion. After an overview of modeling approaches, the three remaining chapters consider the three distinct cases of premixed, non-premixed, and partially premixed combustion, respectively. This book will be of value to researchers and students of engineering and applied mathematics by demonstrating the current theories of turbulent combustion within a unified presentation of the field.
Author: Marlene McDonald
Publisher:
ISBN:
Category : Turbulent diffusion (Meteorology)
Languages : en
Pages : 90
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Author: Jay A. Hammer
Publisher:
ISBN:
Category : Electronic dissertations
Languages : en
Pages : 280
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Author: G. D. Rambach
Publisher:
ISBN:
Category : Diffusion
Languages : en
Pages : 102
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 26
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Systematic comparisons have been obtained between hydroxyl time series as measured by picosecond time-resolved laser-induced fluorescence (PITLIF) and as predicted by large-eddy simulations (LES) for turbulent non-premixed H2/N2 jet diffusion flames. The measured and predicted autocorrelation functions for OH were found to collapse to the same shape when normalized by their integral time-scales. However, the time-scales predicted by LES were systematically low by a factor of 2-3 as compared to the PITLIF measurements. Time series for hydroxyl and total number density were also obtained using (PITLIF) and laser Rayleigh scattering (LRS), respectively, in non-premixed and partially premixed turbulent H2/CH4/N2-air flames having similar Rayleigh cross-sections for air and the exhaust gases. The measured PSDs for OH and number density were found to collapse to the same shape when normalized by their respective integral time-scales. The density to OH time-scale ratio was typically 2-4, with larger ratios prevailing nearer non-premixed conditions owing to thinner OH flamelets. Finally, a novel PITLIF methodology has been developed which is capable of simultaneous two-point, time-series measurements of OH concentrations in turbulent flames. Two-point time-series data obtained in a standard H2 diffusion flame at Re = 10,000 have been used to compute space-time correlations, spatial autocorrelation functions, and integral length-scales. Preliminary two-point results are discussed with a focus on implications for future measurements in gas-turbine combustors and thrust augmentors.
Author: John Henry Kent
Publisher:
ISBN:
Category : Flame
Languages : en
Pages : 548
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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In current study Numerical simulation of turbulent combustion process is approached using One Dimensional Turbulence (ODT) model. The ODT model is based on the coupling of molecular processes (reaction and diffusion) with turbulent transport in a spatially- and temporally-resolved fashion over a one-dimensional domain. The domain corresponds to a transverse (or radial) direction; while, the transient evolution of the thermo-chemical scalars on the 1D domain represents the spatial evolution downstream of the jet inlet. The linear-eddy approach for modeling molecular mixing in turbulent flow involves stochastic simulation on a 1D domain with sufficient resolution to predict all relevant physical length scales properly. Firstly ODT is carried out to predict the hydrogen and air jet diffusion flame with helium dilution in the fuel. The comparison with existing experimental data was made for the numerical result of ODT simulation of jet diffusion flames in both conditional means and rms of scalars of measurements and computational results. Another application of ODT was made in present work to verify the capability of prediction of autoignition (self-ignition) of one of free shear layer flow -- jet diffusion flow. Different range of pressure and Reynolds number are set to identify the effects of turbulence intensity and mixture properties on the self-ignition chemistry. Autoignition delay time was studied based on these different conditions. At the same time the ability of the prediction of mixture temperature and species mass fraction profile were tested. A principle numerical result is expected and discussed. Conditional pdf and progress variable were used to analyze the computational result of ODT. Analysis was focus on the temperature growth and the mass fraction distribution of intermediate species and product.
Author: Ming Chen
Publisher:
ISBN: 9783896536587
Category : Turbulence
Languages : en
Pages : 179
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