Results 21 to 30 of about 1,020 (262)

Scaling of turbulent flame speed for expanding flames with Markstein diffusion considerations [PDF]

Physical Review E, 2013
In this paper we clarify the role of Markstein diffusivity, which is the product of the planar laminar flame speed and the Markstein length, on the turbulent flame speed and its scaling, based on experimental measurements on constant-pressure expanding turbulent flames.
Swetaprovo, Chaudhuri, Fujia, Wu, Chung K, Law   +2 more
openaire   +2 more sources

Influence of Turbulent Scalar Mixing Physics on Premixed Flame Propagation

Journal of Combustion, 2011
The influence of reactive scalar mixing physics on turbulent premixed flame propagation is studied, within the framework of turbulent flame speed modelling, by comparing predictive ability of two algebraic flame speed models: one that ...
H. Kolla, N. Swaminathan
doaj   +1 more source

Numerical Simulation of Laminar and Turbulent Methane/Air Flames Based on a DRG-Derived Skeletal Mechanism

Eurasian Chemico-Technological Journal, 2020
Simulation of turbulent flames using detailed chemical mechanisms is still a challenge in numerical combustion due to the large number of species and the stiffness of the system of governing equations.
F. C. Minuzzi, Ch. Yu, U. Maas
doaj   +1 more source

Machine learning tabulation of thermochemistry of fuel blends

Applications in Energy and Combustion Science, 2022
The objective of the present work is to develop a machine learning tabulation methodology for thermochemistry that accounts for fuel blends. The approach is based on the hybrid flamelet/random data and multiple multilayer perceptrons (HFRD-MMLP ...
Tianjie Ding, Stelios Rigopoulos, W.P. Jones   +2 more
doaj   +1 more source

Modelling of turbulent hydrogen-blended premixed flames using algebraic flame surface wrinkling closure for the Lewis numbers and mean local burning velocity

Alexandria Engineering Journal, 2022
Hydrogen-blended fuel is of fundamental interest due to difficulties in modelling and its practical significance for the development of high-performance hydrogen combustion devices and safety technologies for the prediction and prevention of fire or ...
Siva PR Muppala
doaj   +1 more source

The interaction of high-speed turbulence with flames: Global properties and internal flame structure [PDF]

Combustion and Flame, 2010
We study the dynamics and properties of a turbulent flame, formed in the presence of subsonic, high-speed, homogeneous, isotropic Kolmogorov-type turbulence in an unconfined system. Direct numerical simulations are performed with Athena-RFX, a massively parallel, fully compressible, high-order, dimensionally unsplit, reactive-flow code.
Poludnenko, Alexei Y., Oran, Elaine S.
openaire   +2 more sources

Impact of Turbulence Intensity and Equivalence Ratio on the Burning Rate of Premixed Methane–Air Flames

Energies, 2011
Direct Numerical Simulations (DNS) have been conducted to study the response of initially laminar spherical premixed methane–air flame kernels to successively higher turbulence intensities at five different equivalence ratios.
Gábor Janiga, Gordon Fru, Dominique Thévenin   +2 more
doaj   +1 more source

Turbulent partially cracked ammonia/air premixed spherical flames

Fuel Communications
The combustion of ammonia requires, for most energy conversion systems, a combustion promoter such as hydrogen to guarantee the start-up, stability and combustion efficiency.
S. Zitouni, P. Bréquigny, C. Mounaïm-Rousselle   +2 more
doaj   +1 more source

Lean blow-off investigation in a linear multi-burner combustor operated in premixed and non-premixed modes

Applications in Energy and Combustion Science, 2022
The flame behaviour and the lean blow-off (LBO) mechanism of a multi-burner linear arrangement of five identical burners each fitted with a central bluff body and a swirler up- stream, operated in either premixed or non-premixed mode, was studied ...
Roberto Ciardiello, Rohit S. Pathania, Ingrid El Helou, Epaminondas Mastorakos   +3 more
doaj   +1 more source

Turbulent Flames Speeds and Laminar Burning Velocities of Dusts using the ISO 1 m³ Dust Explosion Method

Chemical Engineering Transactions, 2014
The ISO 1 m3 dust explosion vessel was instrumented with thermocouples acting as flame detectors. These were used with methane/air gas explosions to show that the explosion flame was spherical in the constant pressure phase of the explosion and that a ...
H. Sattar, G.E. Andrews, H.N. Phylaktou, B.M. Gibbs   +3 more
doaj   +1 more source