Flowfield-flame structure interactions in an oscillating swirl flame

Flowfield-flame structure interactions in an oscillating swirl flame: An investigation using phase resolved and simultaneous OH-PLIF and stereoscopic PIV measurements

A swirling CH4/air diffusion flame at atmospheric pressure was stabilized in a gas turbine model combustor with good optical access. The investigated flame with a thermal power of 10 kW and an overall equivalence ratio of 0.75 exhibited pronounced thermoacoustic oscillations at a frequency of 295 Hz. The main goal of the presented work was a detailed experimental characterization of the flame b...

Part III Swirl Stabilized Turbulent Flame Dynamics

Flame Structure Interactions and State Relationships in an Unsteady Partially Premixed Flame

In this investigation our objective is 1) to compare the similitude between an unsteady, two-dimensional (axisymmetric), partially premixed  ame and an analogous steady, partially premixed  amelet to determine if state relationshipsin terms ofamodiŽ ed conserved scalar applyand2) to investigate amestructure interactionsbetween the various reaction zones contained in partially premixed  ames...

Bifurcation of flame structure in a lean-premixed swirl-stabilized combustor: transition from stable to unstable flame

The present work addresses unsteady flame dynamics in a lean-premixed swirl-stabilized combustor, with attention focused on the transition of flame structure from a stable to an unstable state. It was found that the inlet temperature and equivalence ratio are the two most important variables determining the stability characteristics of the combustor. A slight increase in the inlet mixture tempe...

Flame-generated Vorticity Production in Premixed Flame-vortex Interactions

INTRODUCTION Theoretical analysis, experimental observations, and numerical simulations have all indicated that flame-vortex interactions play an important role in the propagation and extinguishment of turbulent flames in microgravity [1]. Most studies of flame-vortex interactions ignore the effects of gravity and experiments are usually conducted in Earth gravity. Recently, Sinibaldi et al. [2...