Challenges and Progress in Controlling Dynamics in Gas Turbine Combustors

Detailed characterization of the dynamics of thermoacoustic pulsations in a lean premixed swirl flame

“…The physical and chemical mechanisms driving the instabilities are based on a complex interaction between combustor geometry, pressure, flow field, mixing, chemical reactions, and heat release and are not understood well enough yet. While active and passive control mechanisms have been developed to reduce or even eliminate instabilities in some industrial burners [8][9][10][11][12], the problem is not fundamentally solved. Major efforts are currently being made in the development of numerical simulation tools in order to predict unsteady combustion behavior so that improved GT combustors can be designed with their help [1][2][3][13][14][15][16][17].…”

Experimental and Theoretical Investigation of the Flashback of a Swirling, Bluff-Body Stabilised, Premixed Flame

“…Increasing concerns about the emission of nitrogen oxides has encouraged power industry to utilise lean 20 premixed combustion in land-based power generation [1]. This combustion technology, although efficient in 21 reducing NOx emission, suffers from a range of dynamic problems including thermoacoustic instabilities [2], 22 flame flashback and blow-off [1].…”

“…This combustion technology, although efficient in 21 reducing NOx emission, suffers from a range of dynamic problems including thermoacoustic instabilities [2], 22 flame flashback and blow-off [1]. Such issues severely limit the operability of the combustor and therefore have 23 hindered the wide application of lean premixed combustion [3].…”

Active Combustion Control for Aircraft Gas-Turbine Engines - Experimental Results for an Advanced, Low-Emissions Combustor Prototype

“…• E-mail your question to help@sti.nasa.gov Mass flow P Pressure P 3 Combustor inlet pressure P 3DynA Sensed dynamic combustor inlet pressure, first location P 3DynB Sensed dynamic combustor inlet pressure, second location P 4 Combustor pressure P 4DynUp Sensed dynamic combustor pressure, upstream location P 4DynDn Sensed dynamic combustor pressure, downstream location…”