Flow Dynamics in a Swirl Combustion System - Couverture souple

Ramirez-Vazquez, Juan A.; Segoviano-Garfias, Jose J. N.; Rubio-Jimenez, Carlos A.

 
9783639861235: Flow Dynamics in a Swirl Combustion System
Couverture souple
ISBN 10 : 363986123X ISBN 13 : 9783639861235
Editeur : Scholars' Press, 2015

Synopsis

Swirling flows provide intensive mixing in a small volume in addition to flame stabilization by the formation of a central recirculation zone which back-circulates heat. A numerical study of unsteady isothermal flow in a pilot scale pulverized- fuel swirl combustor has been performed using the standard k − epsilon turbulence model and Reynolds stress model (RSM). The objective of this work is to compare the numerical predictions of the two turbulence models. The precession is induced by a tangential inlet, for primary air, and guide vanes, for secondary air. A sequence of CFD solutions on successively finer meshes is examined and the order of accuracy of the solutions is estimated by Richardson extrapolation. The results for a Reynolds number of 54 425 and 76 400, swirl number of 0.78 and 0.82 for primary and secondary air, respectively, show the presence of a large and asymmetric region corresponding to the precessing vortex core. Moreover, spiral and bubble type vortex breakdown have been observed and their frequencies analyzed by the monitored of velocities using Fast Fourier Transform (FFT).

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Présentation de l'éditeur

Swirling flows provide intensive mixing in a small volume in addition to flame stabilization by the formation of a central recirculation zone which back-circulates heat. A numerical study of unsteady isothermal flow in a pilot scale pulverized- fuel swirl combustor has been performed using the standard k − epsilon turbulence model and Reynolds stress model (RSM). The objective of this work is to compare the numerical predictions of the two turbulence models. The precession is induced by a tangential inlet, for primary air, and guide vanes, for secondary air. A sequence of CFD solutions on successively finer meshes is examined and the order of accuracy of the solutions is estimated by Richardson extrapolation. The results for a Reynolds number of 54 425 and 76 400, swirl number of 0.78 and 0.82 for primary and secondary air, respectively, show the presence of a large and asymmetric region corresponding to the precessing vortex core. Moreover, spiral and bubble type vortex breakdown have been observed and their frequencies analyzed by the monitored of velocities using Fast Fourier Transform (FFT).

Biographie de l'auteur

Juan Antonio Ramirez Vazquez, Ph. D.: Studied Energy Efficiency and Renewable Energies at University of Zaragoza, Spain. Assistant Professor at University of Guanajuato, Mexico.

Les informations fournies dans la section « A propos du livre » peuvent faire référence à une autre édition de ce titre.

Éditeur
Scholars' Press
Date d'édition
2015
Langue
anglais
ISBN 10 
363986123X
ISBN 13 
9783639861235
Reliure
Broché
Nombre de pages
92
Coordonnées du fabricant
non disponible
Personne responsable
non disponible