Interaction of a Vortex Ring with a Non-premixed Methane Flame PDF Download
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Author: Cosmin Safta
Publisher:
ISBN:
Category :
Languages : en
Pages : 488
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Book Description
Author: Cosmin Safta
Publisher:
ISBN:
Category :
Languages : en
Pages : 488
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 69
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Book Description
The characteristics of nonpremixed flame-wall interaction have been studied in a reacting vortex ring configuration. A finite duration axisymmetric methane jet is injected into a quiescent oxidizer ambient to generate a laminar vortex ring. Fuel and oxidizer temperatures are adjusted such that auto-ignition takes place and results in the formation of a nonpremixed flame surrounding the vortex ring. The methane combustion is modelled using detailed kinetic mechanism CR13.0 with the reactions and the species containing nitrogen removed, except N 2 . The flame is propelled by the ring induced velocity and interacts with an isothermal inert wall which is perpendicular to the direction of the flame propagation. Interactions have been studied for two different wall conditions---one with and one without a thermal boundary layer. Heat release rate, vorticity, and temperature fields have been examined during the interaction.* (Abstract shortened by UMI.) *This dissertation is a compound document (contains both a paper copy and a CD as part of the dissertation). The CD requires the following system requirements: Windows MediaPlayer or RealPlayer.
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Languages : en
Pages : 9
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Detailed studies of flame-vortex interactions are extremely valuable to improve our understanding of turbulent combustion regimes. Combined experimental and numerical studies have already been performed in the premixed case during previous investigations. Therefore, we decided to carry out a detailed experimental investigation on the regimes observed during interaction of a vortex ring and a non-premixed, diluted, hydrogen/air, laminar counterflow flame. To obtain the needed information, several optical diagnostic techniques have been used, in particular, planar laser-induced fluorescence (PLIF) of acetone to quantify vortex structure and speed, simultaneous OH PLIF and Rayleigh measurements, and simultaneous OH PLIF and particle-imaging velocimetry (PIV) measurements. A post-processing of the results combined with direct simulations using detailed chemistry and transport models to check the quality of the postprocessing procedures has led to the construction of a spectral interaction diagram. Eight interaction types were found, emphasizing the relative importance of competing physical phenomena such as straining, curvature, wrinkling, roll-up, and extinction. In particular, we observe two different types of extinction, one due to the combined action of curvature and straining, and the other purely due to straining effects. It was also observed that many vortices are too small or dissipate too rapidly to influence the flame. In other cases, the vortex ring can lead to the formation of pockets of oxidizer burning in the fuel part of the domain. These regimes and the limits between them have important implications for the modeling of turbulent non-premixed combustion.
Author: G. Patnaik
Publisher:
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Category :
Languages : en
Pages :
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Author: G. J. Fiechtner
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Category :
Languages : en
Pages :
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Category : Power resources
Languages : en
Pages : 508
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Author: Gregory J. Fiechtner
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Category :
Languages : en
Pages :
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Author:
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Category : Combustion
Languages : en
Pages : 546
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Author: Prasanta Sahoo
Publisher: Springer
ISBN: 3319969684
Category : Technology & Engineering
Languages : en
Pages : 756
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This book presents selected extended papers from The First International Conference on Mechanical Engineering (INCOM2018), realized at the Jadavpur University, Kolkata, India. The papers focus on diverse areas of mechanical engineering and some innovative trends in mechanical engineering design, industrial practices and mechanical engineering education. Original, significant and visionary papers were selected for this edition, specially on interdisciplinary and emerging areas. All papers were peer-reviewed.
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Category :
Languages : en
Pages : 8
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The interaction of a vortex pair with a premixed flame serves as an important prototype for premixed turbulent combustion. In this study, we investigate the interaction of a counter-rotating vortex pair with an initially flat premixed methane flame. We compare computational solutions obtained using a time-dependent, two-dimensional adaptive low Mach number combustion algorithm that incorporates GRI-Mech 1.2 for the chemistry, thermodynamics, and transport of the chemical species. We discuss the mechanical nature of the flame-vortex interaction and the features of the interaction that are strongly affected by fuel equivalence ratio, . We find that the circulation around the vortex scours gas from the preheat zone in front of the flame, making the interaction sensitive to equivalence ratio. For cases with 1, the peak mole fraction of CH across the flame is relatively insensitive to the vortex, whereas for richer flames we observe a substantial and rapid decline in the peak CH mole fraction, commencing early in the flame-vortex interaction. The peak concentration of HCO is found to correlate, in both space and time, with the peak heat release across a broad range of equivalence ratios. The model also predicts a measurable increase in C2H2 as a result of interaction with the vortex and a marked increase in the low-temperature chemistry activity.
