Results 21 to 30 of about 20,374 (260)
Impact of symmetry breaking on the Flame Transfer Function of a laminar premixed flame [PDF]
Proceedings of the Combustion Institute, 2019 This work presents a numerical study of the acoustic response of a laminar flame with tunable asymmetry. A V-shaped premixed flame is stabilised in the wake of a cylindrical flame holder that can be rotated. The configuration is symmetric when the flame holder is fixed but increasing its rotation rate breaks the symmetry of the flow. This configuration
Kaiser, Thomas +3 more
openaire +3 more sources
Propulsion and Power Research, 2017 The effect of upstream velocity perturbations on the response of a premixed flame was investigated in terms of the flame transfer function dependency on excitation frequency.
Ghazaleh Esmaeelzade +3 more
doaj +1 more source
International Journal of Photoenergy, 2019 Accurate and reliable measurements of the 3D flame temperature profile are highly desirable to achieve in-depth understanding of the combustion and pollutant formation processes.
Biao Zhang +4 more
doaj +1 more source
Applied Sciences, 2021 The reasonably accurate numerical simulation of methane–air combustion is important for engineering purposes. In the present work, the validations of sub-models were carried out on a laboratory-scale turbulent jet flame, Sandia Flame D, in comparison ...
Di He +3 more
doaj +1 more source
Energies, 2023 Thermoacoustic instabilities in gasturbine combustor systems can be predicted in the design phase with a thermoacoustic network model. In this model, the coupling between acoustic pressure fluctuations and the combustion rate is described by the Flame ...
Mehmet Kapucu, Jim B. W. Kok
doaj +1 more source
Identification of instantaneous flame transfer functions
Combustion and FlameMost existing system identification methods are designed for time-invariant systems. However, for many practical applications, data collection over a wide range of parameters under stationary conditions is either infeasible or costly. To address this limitation, we propose a time-domain, nonparametric methodology for linear, time-varying (LTV) systems,
Justus Florian Radack +2 more
openaire +2 more sources
Flame Transfer Functions and Dynamics of a Closely Confined Premixed Bluff Body Stabilized Flame With Swirl [PDF]
Journal of Engineering for Gas Turbines and Power, 2020 Abstract The flame transfer function (FTF) and flame dynamics of a highly swirled, closely confined, premixed flame is studied over a wide range of equivalence ratios and bulk velocities at a fixed perturbation level at the dump plane. The operating conditions are varied to examine the ratio of flame height to velocity in scaling the FTF.
Nygård, Håkon T., Worth, Nicholas A.
openaire +3 more sources
EnergiesIn combustor systems, thermoacoustic instabilities may occur and must be avoided for reliable operation. An acoustic network model can be used to predict the eigenfrequencies of the instabilities and the growth rate by incorporating the combustion ...
Mehmet Kapucu +2 more
doaj +1 more source
AIP Advances, 2019 Experimental study on combustion instability of lean premixed swirl flame was conducted for methane-hydrogen mixtures, and the influence mechanism of hydrogen content (0%, 10%, 20%, and 40%) on the combustion instability under different acoustic ...
Mingxiao Wang, Yingjie Zhong, Kai Deng
doaj +1 more source
Synergistic Effect of Intumescent Flame Retardant and Organically Modified Montmorillonite on Flame-Retardant and Foaming Properties of High Density Polyethylene/Walnut Shell Powder Biocomposites [PDF]
علوم و تکنولوژی پلیمر, 2017 The synergistic effects of organic montmorillonite (OMMT) and ammonium polyphosphate (APP) on flame retardant enhancement of High density polyethylene/walnut shell powder (HDPE/WSP) biocomposite were investigated by using the limiting oxygen index (LOI),
Ebrahim Bahreyni +3 more
doaj +1 more source