Turbulent Flame - an overview | ScienceDirect Topics
A common way to initiate a deflagration (also called a laminar or turbulent flame depending on whether the flow is laminar or turbulent) is to discharge a spark inside a tube containing a combustible mixture. A planar deflagration may develop and travel at a nearly constant speed (burning velocity) for a distance roughly between 2 and 50 tube ...
Turbulent Flame - an overview | ScienceDirect Topics
In most practical combustion chambers, flames are turbulent. The burning velocity generally is observed to increase as the intensity of the turbulence increases. Although the mechanisms of turbulent flame propagation are not well understood, there exist many ideas on the subject and various methods for estimating turbulent burning velocities. A ...
Premixed Flame Regimes • Flamelets –all turbulent scales larger than flame thickness –turbulent flame acts like distorted laminar flame • Wrinkled Flamelets –u rms < So L –laminar flame propagation dominates turbulent displacement, i.e., any corrugations in flame front being induced by turbulence Ka L =1 " k = f L Da Ka R =1 " <1 Da ...
Turbulent flame-vortex dynamics of bluff-body premixed flames
2021年1月1日 · In this investigation, a bluff-body stabilized, turbulent, premixed flame is analyzed in a high-speed combustor. A custom-designed turbulence generator is used to vary the inflow turbulence conditions and understand the subsequent impacts on the flame-flow field.
Here we review, first, our knowledge of the structure of turbulent pre-mixed flames and the fundamental processes involved. Second, we review the application of probabilistic field theories (primarily the pdf approach) to turbulent premixed flames to reveal their achievements, shortcomings, and issues yet to be resolved.
– Representation of turbulent flame as unsteady reaction-diffusion layer that is embedded in turbulent flame – Interaction of flame structure with turbulent environment leads to stretching, deformation, and extinction of flame 6
Turbulent flame–wall interaction: a direct numerical simulation …
The simulations are used to investigate the effects of the wall turbulent boundary layer (i) on the structure of a hydrogen–air premixed flame, (ii) on its near-wall propagation characteristics and (iii) on the spatial and temporal patterns of the convective wall heat flux.
Temperature effect on turbulent burning velocity of lean …
2024年12月11日 · The turbulent burning velocity ( S T ) is an important parameter for the design and modeling of hydrogen-fueled engines given the high propagation speed of hydrogen flames. It has been well documented that S T of hydrogen flames can be dramatically increased by thermo-diffusive effects which are sensitive to thermodynamic conditions.
Turbulent Flame Propagation - Texas A&M University
Turbulent flame speed is a characteristic of the rate of propagation of a flame in a turbulent flow field, such as that in a gas turbine combustor or a reciprocating internal combustion engine. In the study of turbulent combustion phenomena, turbulent flame speed combines the fields of chemical kinetics and fluid mechanics.
Scaling transition of turbulent flame speed for thermodiffusively ...
2024年11月5日 · In the context of turbulent premixed combustion, the turbulent flame speed S T is defined as the speed at which reactants are consumed through a suitably defined average flame surface. It is one of the fundamental quantities to investigate and characterize to model premixed flames in a turbulent setting.
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