Results 1 to 10 of about 35,665 (238)

Combustion Regimes in Turbulent Non-Premixed Flames for Space Propulsion

open access: yesAerospace, 2023
Direct numerical simulations of non-premixed fuel-rich methane–oxygen flames at 20 bar are conducted to investigate the turbulent mixing burning of gaseous propellants in rocket engines. The reacting flow is simulated by using an EBI-DNS solver within an
Daniel Martinez-Sanchis   +3 more
doaj   +2 more sources

A Generalised Series Model for the LES of Premixed and Non-Premixed Turbulent Combustion

open access: yesEnergies, 2023
In this study, the generality and prediction accuracy of a generalised series model for the large eddy simulation of premixed and non-premixed turbulent combustion is explored. The model is based on the Taylor series expansion of the chemical source term
Weilin Zeng   +4 more
doaj   +5 more sources

In-flame soot quantification of N-Hexadecane droplets using diffused back-illumination extinction imaging

open access: yesCase Studies in Thermal Engineering, 2022
To gain insights into spray combustion, the combustion characteristics of single droplets need be investigate. In this study, soot production measurements were performed on single droplet of N-Hexadecane using the two optical techniques of natural flame ...
Weiwei Shang   +3 more
doaj   +1 more source

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

open access: yesFuels, 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   +3 more
doaj   +1 more source

Comparison of the Reactive Scalar Gradient Evolution between Homogeneous MILD Combustion and Premixed Turbulent Flames

open access: yesEnergies, 2021
Moderate or intense low-oxygen dilution (MILD) combustion is a novel combustion technique that can simultaneously improve thermal efficiency and reduce emissions.
Hazem S.A.M. Awad   +3 more
doaj   +1 more source

Effects of hydrogen addition on NOx formation in a non-premixed methane low-NOx combustor

open access: yesMechanical Engineering Journal, 2023
Hydrogen is a promising carbon-free fuel, but nitric oxides (NOx) emissions are significantly increased with higher temperature in hydrogen combustion.
Jiaying CHENG, Tong ZHU, Biao DENG
doaj   +1 more source

Computations of a Bluff-Body Stabilised Premixed Flames Using ERN Method

open access: yesChemEngineering, 2022
Combustible carbon-based energy is still prevailing as the world’s leading energy due to its high energy density. However, the oxidation of these hydrocarbons disturbs the natural carbon cycle greatly by increasing greenhouse gases.
Shokri Amzin
doaj   +1 more source

A Combustion Regime-Based Model for Large Eddy Simulation

open access: yesEnergies, 2021
The aim of this work is to propose a unified (generalized) closure of the chemical source term in the context of Large Eddy Simulation able to cover all the regimes of turbulent premixed combustion.
Eugenio Giacomazzi, Donato Cecere
doaj   +1 more source

Experimental Study on Flame Response Characteristics of a Non-Premixed Swirl Model Combustor

open access: yesEnergies, 2023
Non-premixed swirl combustion has been widely used in pieces of industrial combustion equipment such as industrial boilers, furnaces, and certain specific gas turbine combustors.
Chen Yang   +6 more
doaj   +1 more source

Investigation of Harmonic Response in Non-Premixed Swirling Combustion to Low-Frequency Acoustic Excitations

open access: yesAerospace, 2023
The propagation mechanism of flow disturbance under acoustic excitations plays a crucial role in thermoacoustic instability, especially when considering the effect of non-premixed combustion on heat release due to reactant mixing and diffusion.
Jinrong Bao   +5 more
doaj   +1 more source

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