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ENCIT 2018
Brazilian Congress of Thermal Sciences and Engineering
FLAMES DYNAMICS OF BLUFF-BODY-STABILIZED IN LEAN PREMIXED STOICHIOMETRIC SYNGAS/AIR
Submission Author:
Samir Boset Rojas Chávez , SP
Co-Authors:
Samir Boset Rojas Chávez, João Carvalho
Presenter: Samir Boset Rojas Chávez
doi://10.26678/ABCM.ENCIT2018.CIT18-0791
Abstract
Large-eddy simulations (LES) are conducted through a Computational Fluid Dynamics (CFD) software to investigate the dynamics of lean premixed syngas flames stabilized by a bluff-body near blow-off conditions, in order to provide fundamental insights into the physical mechanisms responsible for the critical phenomena and known the bluff-off limits working in stoichiometric conditions. Flames in two dimensions with a square flame holder are adopted as the model configuration, and a syngas mixture at an equivalence ratio of 1 with the CO:H2 ratio of 1 is considered. As the inlet velocity is increased, the initially stable steady flames undergo a transition to an unsteady mode of regular asymmetric fluctuation. When the inlet velocity is further increased, the flame is eventually blown off. Between the regular fluctuation mode and blow-off limit, there exists a narrow range of the inlet velocity where the flames exhibit periodic local extinction and recovery.
Keywords
Bluff-Body stabilized flames, Premixed flame, Blow-off limits, Syngas, Large Eddy Simulation (LES)
