Results 1 to 10 of about 2,639 (256)
Curvature and confinement effects for flame speed measurements in laminar spherical and cylindrical flames [PDF]
Combustion and Flame, 2013 This paper discusses methods used to obtain laminar flame speeds in spherical laminar premixed flames. Most recent studies express the laminar flame consumption speed as ρb/ρudR/dt, where R is the flame radius and ρb/ρu is the ratio of the burnt to the fresh gas density (ρb is evaluated at chemical equilibrium and supposed to be constant).
Thierry Poinsot, Laurent Selle
exaly +4 more sources
Flame Curvature Distribution in High Pressure Turbulent Bunsen Premixed Flames [PDF]
Flow, Turbulence and Combustion, 2018 The flame curvature statistics of turbulent premixed Bunsen flames have been analysed in this paper using a Direct Numerical Simulation (DNS) database of turbulent Bunsen flames at ambient and elevated pressures. In order to be able to perform a large parametric study in terms of pressure, heat release parameter, turbulence conditions and nozzle ...
Michael Pfitzner +2 more
exaly +3 more sources
Evolution of Flame Curvature in Turbulent Premixed Bunsen Flames at Different Pressure Levels [PDF]
Flow, Turbulence and Combustion, 2019 The physical mechanisms underlying the curvature evolution in turbulent premixed Bunsen flames at different thermodynamic pressures are investigated using a three-dimensional Direct Numerical Simulation database. It is found that, due to the occurrence of the Darrieus-Landau instability, the high-pressure flame exhibits higher probability of developing
Cesar Dopazo +2 more
exaly +3 more sources
Choice of reaction progress variable under preferential diffusion effects in turbulent syngas combustion based on detailed chemistry direct numerical simulations [PDF]
Scientific ReportsThe combustion of hydrogen and carbon-monoxide mixtures, so-called syngas, plays an increasingly important role in the safety context of non-fossil energy generation, more specifically in the risk management of incidents in process engineering plants for
Vinzenz Silvester Wehrmann +3 more
doaj +2 more sources
Flame self-interactions in MILD combustion of homogeneous and inhomogeneous mixtures [PDF]
Scientific ReportsFlame self-interaction (FSI) events in Moderate or Intense Low-Oxygen Dilution (MILD) combustion of homogeneous and inhomogeneous mixtures of methane and oxidiser have been analysed using three-dimensional Direct Numerical Simulations (DNS).
Khalil Abo-Amsha +2 more
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AIP Advances, 2022 The combined effects of radiative heat loss, curvature, and preferential diffusion on laminar non-premixed flames (or flamelets) are investigated in this work by using asymptotic analysis.
Yushan Gao +4 more
doaj +1 more source
Energies, 2022 Due to its enhancement in the flame speed, ozone added in lean premixed syngas turbulent jet flame was investigated by the three-dimensional direct numerical simulation method in the near field of the flame.
Cong Xu +5 more
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Applications in Energy and Combustion Science, 2022 In the present work, direct numerical simulation data of a laboratory-scale high Karlovitz number (Ka) jet flame with a strong mean shear and a high Ka freely propagating planar flame without a mean shear were analyzed to explore the influence of flame ...
Tingquan Tian +3 more
doaj +1 more source
Flame trajectory of a non-vertical turbulent buoyant jet flame
Applications in Energy and Combustion Science, 2021 This paper presents a theoretical and experimental study on the flame trajectory of a non-vertical turbulent diffusion flame in still air. A series of propane turbulent flame tests (inner diameter of the burner: d=13 mm) with different initial Froude ...
Wei Gao +4 more
doaj +1 more source
Curvature and Velocity of Methane-Air Bunsen Flame Tips [PDF]
Flow, Turbulence and Combustion, 2011 PIV and photographic recording are used to measure the velocity of the fresh gas and the shape of the reaction layer in a region around the tip of a methane- air Bunsen flame attached to a cylindrical burner. The results compare well with numerical simulations carried out with an infinite activation energy reaction model. The experimental and numerical
García-Soriano, G. +2 more
openaire +2 more sources