Results 261 to 270 of about 21,289 (291)
Some of the next articles are maybe not open access.
URANS-Modelling of Flame Transfer Functions of Turbulent Premixed Jet Flames
Volume 1: Turbo Expo 2004, 2004The understanding of the formation of self excited pressure oscillations in technical combustion systems depends on the knowledge of the dynamical behaviour of the flame used. As an important mechanism driving these combustion instabilities the formation and reaction of coherent large-scale ring-vortices has been indentified.
Matthias Hettel +4 more
openaire +1 more source
Flame Transfer Functions for Turbulent, Premixed, Ammonia-Hydrogen-Nitrogen-Air Flames
Volume 3B: Combustion, Fuels, and Emissions, 2022Abstract Ammonia is a promising hydrogen and energy carrier but also a challenging fuel to use in gas turbines, due to its low flame speed, limited flammability range, and the production of NOx from fuel-bound nitrogen. Previous experimental and theoretical work has demonstrated that partially-dissociated ammonia (NH3/H2/N2 mixtures) can
Samuel Wiseman +2 more
openaire +1 more source
Modeling of premixed swirling flames transfer functions
Proceedings of the Combustion Institute, 2011Abstract An analytical model is derived for the linear response of swirling flames submitted to velocity disturbances. The flame dynamics is represented by a linearized version of the G-equation. Turbulent fluctuations are first averaged in time to obtain a kinematic equation in which the flame is represented by a wrinkled sheet.
Paliès, P. +3 more
openaire +2 more sources
The transfer function of premixed turbulent jet flames
Symposium (International) on Combustion, 1971For low-frequency pressure oscillations in combustion chambers, the transfer function of the flame is an important parameter. This transfer function represents the dependence between the burned and injected mass-flow rate on the pressure oscillations. The stability region of a system can be defined only if the transfer function is known. In this paper,
R. Becker, R. Günther
openaire +1 more source
On the low-frequency limit of flame transfer functions
Combustion and Flame, 2007The response of a premixed flame to quasi-steady flow perturbations is considered. It is found that in this low-frequency limit, constraints on the flame transfer function can be established from global conservation laws for mass, energy, and momentum.
Wolfgang Polifke, Chris Lawn
openaire +1 more source
Flame Transfer Function Calculations for Combustion Oscillations
Volume 2: Coal, Biomass and Alternative Fuels; Combustion and Fuels; Oil and Gas Applications; Cycle Innovations, 2001Combustors with fuel-spray atomisers are particularly susceptible to a low-frequency oscillation at idle and sub-idle conditions. For aero-engine combustors, the frequency of this oscillation is typically in the range 50-120Hz and is commonly called ‘rumble’.
M. Zhu, A. P. Dowling, K. N. C. Bray
openaire +1 more source
Effect of Flame Structure on the Flame Transfer Function in a Premixed Gas Turbine Combustor
Journal of Engineering for Gas Turbines and Power, 2008The flame transfer function in a premixed gas turbine combustor is experimentally determined. The fuel (natural gas) is premixed with air upstream of a choked inlet to the combustor. Therefore, the input to the flame transfer function is the imposed velocity fluctuations of the fuel/air mixture without equivalence ratio fluctuations. The inlet-velocity
Daesik Kim +5 more
openaire +1 more source
Flame Transfer Function of a Swirl Ammonia-Air Premixed Flame
2022Shohdy, Nader N. +2 more
openaire +1 more source
Identification of flame transfer functions during transient operation
INTER-NOISE and NOISE-CON Congress and Conference ProceedingsPredicting thermoacoustic instabilities requires knowledge of the flame response to acoustic perturbations, which is characterized by the Impulse Response Function. Obtaining stability maps across an extensive parameter space is prohibitively costly with existing methods, both experimentally and numerically, as the data records must be obtained ...
Florian RADACK +2 more
openaire +1 more source
Modeling of flame transfer function of a conical turbulent premixed flame with variable flame speed
Journal of Mechanical Science and Technology, 2022openaire +1 more source