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Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781725049772
Category :
Languages : en
Pages : 26
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Book Description
The application of probability density function (pdf) turbulence models is addressed. For the purpose of accurate prediction of turbulent combustion, an algorithm that combines a conventional computational fluid dynamic (CFD) flow solver with the Monte Carlo simulation of the pdf evolution equation was developed. The algorithm was validated using experimental data for a heated turbulent plane jet. The study of H2-F2 diffusion flames was carried out using this algorithm. Numerical results compared favorably with experimental data. The computations show that the flame center shifts as the equivalence ratio changes, and that for the same equivalence ratio, similarity solutions for flames exist. Hsu, Andrew T. Unspecified Center NAS2-5266...
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781725049772
Category :
Languages : en
Pages : 26
Get Book Here
Book Description
The application of probability density function (pdf) turbulence models is addressed. For the purpose of accurate prediction of turbulent combustion, an algorithm that combines a conventional computational fluid dynamic (CFD) flow solver with the Monte Carlo simulation of the pdf evolution equation was developed. The algorithm was validated using experimental data for a heated turbulent plane jet. The study of H2-F2 diffusion flames was carried out using this algorithm. Numerical results compared favorably with experimental data. The computations show that the flame center shifts as the equivalence ratio changes, and that for the same equivalence ratio, similarity solutions for flames exist. Hsu, Andrew T. Unspecified Center NAS2-5266...
Author:
Publisher:
ISBN:
Category : Turbulence
Languages : en
Pages : 172
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
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: J. P. Sislian
Publisher:
ISBN:
Category : Chemical kinetics
Languages : en
Pages : 68
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Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 836
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 468
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Author: Roger R. Craig
Publisher:
ISBN:
Category :
Languages : en
Pages : 160
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Book Description
The research undertaken in this report deals with the measurement of time averaged flow variables and turbulence intensities in turbulent diffusion flames. The difficulties encountered in separating the effects of temperature, velocity and species concentration on a hot-film anemometer signal required the use of special techniques for measuring the turbulence in the diffusion flames. Results obtained in an axisymmetric air jet are compared with data obtained from a crossed hot-film anemometer. The axial turbulence equations are then derived. Large increases in the axial turbulence intensity, as well as in the jet core length, are found in the diffusion flame, along with reductions in the radial turbulence intensity. Results are examined in light of the general momentum and turbulence intensity equations for flows with density fluctuations and are seen to be consistent with effects deducible for a density-velocity fluctuation correlation.
Author: Ganeshan Balakrishnan
Publisher:
ISBN:
Category :
Languages : en
Pages : 316
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Author: Ibrahim Dincer
Publisher: Springer
ISBN: 3319046810
Category : Technology & Engineering
Languages : en
Pages : 1055
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Book Description
This thorough and highly relevant volume examines exergy, energy and the environment in the context of energy systems and applications and as a potential tool for design, analysis, optimization. It further considers their role in minimizing and/or eliminating environmental impacts and providing for sustainable development. In this regard, several key topics ranging from the basics of the thermodynamic concepts to advanced exergy analysis techniques in a wide range of applications are covered.
Author: George A. Lavoie
Publisher:
ISBN:
Category : Flame
Languages : en
Pages : 32
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Book Description
