Abstract
Pulsation frequency of the cup-burner flame was determined by means of experimental investigations and numerical simulations. Simplified chemical kinetics was successfully implemented into a laminar fluid flow model applied to the complex burner geometry. Our methodical approach is based on the monitoring of flame emission, fast Fourier transformation and reproduction of measured spectral features by numerical simulations. Qualitative agreement between experimental and predicted oscillatory behaviour was obtained by employing a two-step methane oxidation scheme.
Highlights
Nonpremixed flames involve complex phenomena of fluid flow physics closely coupled to chemical reactions leading to the consumption of fuel, formation of combustion products and heat release
Pulsation frequency of the cup-burner flame was determined by means of experimental investigations and numerical simulations
Simplified chemical kinetics was successfully implemented into a laminar fluid flow model applied to the complex burner geometry
Summary
Nonpremixed flames involve complex phenomena of fluid flow physics closely coupled to chemical reactions leading to the consumption of fuel, formation of combustion products and heat release. Our investigations are focused on a methane cup-burner flame [1,2] under ultra-low initial Froude number conditions resulting from the combination of low fuel inlet velocity and geometry of the burner characterized by a relatively large fuel nozzle diameter. In the presence of gravitational force, periodic pulsations (described as varicose mode instabilities [3]) are induced in buoyant nonpremixed flames. This work describes quantitatively this type of hydrodynamic instabilities observed in our experimental setup. Mathematical modelling employing computational fluid dynamics (CFD) was performed at the complex geometry of the cup-burner apparatus
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