Results 21 to 30 of about 611 (182)

Non-Premixed Filtered Tabulated Chemistry: Filtered Flame Modeling of Diffusion Flames

Fuels, 2021
The flame front filtering is a well-known strategy in turbulent premixed combustion. An extension of this approach for the non-premixed combustion context has been proposed by means of directly filtering counterflow diffusion flamelets. Promising results
Pedro Javier Obando Vega, Axel Coussement, Amsini Sadiki, Alessandro Parente   +3 more
doaj   +1 more source

Effects of porous insertion in a round-jet burner on flame characteristics of turbulent non-premixed syngas combustion

Case Studies in Thermal Engineering, 2019
Synthesis gas (Syngas) is a gaseous mixture that consists of 3 species. It is used in creating synthetic natural gas. In this work, the turbulent non-premixed flame of syngas-air combustion in a round-jet burner is numerically investigated. The burner is
Santiphong Klayborworn, Watit Pakdee
doaj   +1 more source

Comparison of Flame Propagation Statistics Extracted from Direct Numerical Simulation Based on Simple and Detailed Chemistry—Part 1: Fundamental Flame Turbulence Interaction

Energies, 2021
In the present study, flame propagation statistics from turbulent statistically planar premixed flames obtained from simple and detailed chemistry, three-dimensional Direct Numerical Simulations, were evaluated and compared to each other.
Felix Benjamin Keil, Marvin Amzehnhoff, Umair Ahmed, Nilanjan Chakraborty, Markus Klein   +4 more
doaj   +1 more source

Ultra-Lean Premixed Turbulent Combustion: Challenges of RANS Modelling

Energies, 2022
The main challenge of improving spark ignition (SI) engines to achieve ever increasing thermal efficiencies and near-zero pollutant emissions today concerns developing turbulent combustion under homogeneous ultra-lean premixed mixtures (HULP).
Lorenzo Sforza, Suliman Abdelwahid, Tommaso Lucchini, Angelo Onorati   +3 more
doaj   +1 more source

Probabilistic deep learning of turbulent premixed combustion

AIP Advances, 2023
A probabilistic data-driven approach that models the filtered reaction rate in large-eddy simulation (LES) is investigated. We propose a novel framework that incorporates a conditional generative adversarial network and a Gaussian mixture model to take ...
Junsu Shin, Victor Xing, Michael Pfitzner, Corentin Lapeyre   +3 more
doaj   +1 more source

Non-Premixed Filtered Tabulated Chemistry for LES: Evaluation on Sandia Flames D and E

Fuels, 2022
The non-premixed filtered tabulated chemistry for large eddy simulations employs numerical filtering to resolve a thin flame front on practical LES numerical grids. The flame structure is modified to be coherent with the domain discretization.
Pedro Javier Obando Vega, Axel Coussement, Amsini Sadiki, Alessandro Parente   +3 more
doaj   +1 more source

A Two-Fluid Conditional Averaging Paradigm for the Theory and Modeling of Turbulent Premixed Combustion

Journal of Combustion, 2019
This paper extends a recent theoretical study that was previously presented in the form of a brief communication (Zimont, C&F, 192, 2018, 221-223), in which we proposed a simple splitting method for the derivation of two-fluid conditionally averaged ...
Vladimir L. Zimont
doaj   +1 more source

Examining the Cascade Hypothesis for Turbulent Premixed Combustion [PDF]

Combustion Science and Technology, 1998
The cascade hypothesis, which was introduced in application for premixed combustion by Yakhot (1988) and Sivashinsky (1988), is examined against the correlations of the turbulent burning velocity data by Bradley, Lau and Lawes (1992) (BLL data). A new, less restrictive formulation of the cascade hypothesis is suggested.
openaire   +3 more sources

Two-Dimensional Tomographic Simultaneous Multi-Species Visualization—Part I: Experimental Methodology and Application to Laminar and Turbulent Flames

Energies, 2020
In recent years, the tomographic visualization of laminar and turbulent flames has received much attention due to the possibility of observing combustion processes on-line and with high temporal resolution.
Thomas Häber, Henning Bockhorn, Rainer Suntz   +2 more
doaj   +1 more source

Conceptual Limitations of the Probability Density Function Method for Modeling Turbulent Premixed Combustion and Closed-Form Description of Chemical Reactions’ Effects

Fluids, 2021
In this paper, we critically analyzed possibilities of probability density function (PDF) methods for the closed-form description of combustion chemical effects in turbulent premixed flames.
Vladimir L. Zimont
doaj   +1 more source