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Author : J. A. Grond
Release : 1980
Genre :
Kind : eBook
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Book Synopsis Numerical Model of a Turbulent Hydrogen Diffusion Flame by : J. A. Grond
Download or read book Numerical Model of a Turbulent Hydrogen Diffusion Flame written by J. A. Grond. This book was released on 1980. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Marcus Ulysses March
Release : 2000
Genre :
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Book Synopsis A PC-based Numerical Model of a Hydrogen Diffusion Flame and Flare Stack in a Crosswind by : Marcus Ulysses March
Download or read book A PC-based Numerical Model of a Hydrogen Diffusion Flame and Flare Stack in a Crosswind written by Marcus Ulysses March. This book was released on 2000. Available in PDF, EPUB and Kindle. Book excerpt:
Author : National Aeronautics and Space Administration (NASA)
Release : 2018-08-10
Genre :
Kind : eBook
Book Rating : 772/5 ( reviews)
Book Synopsis A Study of Hydrogen Diffusion Flames Using PDF Turbulence Model by : National Aeronautics and Space Administration (NASA)
Download or read book A Study of Hydrogen Diffusion Flames Using PDF Turbulence Model written by National Aeronautics and Space Administration (NASA). This book was released on 2018-08-10. Available in PDF, EPUB and Kindle. Book excerpt: 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 : Parham Adnani
Release : 1986
Genre :
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Book Synopsis Numerical Model of a Wall Bounded Turbulent Diffusion Flame by : Parham Adnani
Download or read book Numerical Model of a Wall Bounded Turbulent Diffusion Flame written by Parham Adnani. This book was released on 1986. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Release : 2000
Genre :
Kind : eBook
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Book Synopsis Two-Dimensional Direct Numerical Simulation of Opposed-Jet Hydrogen/Air Flames: Transition From a Diffusion to an Edge Flame by :
Download or read book Two-Dimensional Direct Numerical Simulation of Opposed-Jet Hydrogen/Air Flames: Transition From a Diffusion to an Edge Flame written by . This book was released on 2000. Available in PDF, EPUB and Kindle. Book excerpt: In an opposed-jet diffusion flame experiment, under certain conditions, after the extinction of the diffusion flame, an edge flame can be obtained. It was reported recently in a numerical and an experimental work and is responsible for an interesting transition between two distinct burning flames (multiple solutions). Motivated by our previous numerical results, obtained with simplified kinetics and some recently reported experimental data, we performed direct numerical simulations of this transition to investigate the underlying physical mechanisms. The appearance of an edge flame after the extinction of the diffusion flame, the hysteresis reported in the experiments, and the existence of multiple vigorously burning flames at identical conditions are all captured by our simulations. Our numerical results show that, in the absence of an inert coflow curtain, when the diffusion flame disk is extinguished, an edge flame forms and propagates in the mixing layer. After the formation of this edge flame, even when the applied strain rate is reduced to the initial subcritical value, the diffusion flame disk does not reappear, because the local fluid velocity still exceeds the propagation speed of the edge flame. This hysteresis has significant implications in the common submodel that utilizes the strain rate as a parameter to determine local reignition in flamelet models; it indicates that a subcritical strain rate is not a sufficient condition for the reignition of a diffusion flame. Further investigation of this phenomenon is clearly needed to refine submodels of local extinction and reignition in the flamelet models for turbulent diffusion flames. The opposed-jet configuration provides a convenient platform to analyze edge flames which are stabilized aerodynamically in a two-dimensional geometry, thus making matching two-dimensional direct numerical simulations effective.
