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Fire
Special Issues
Premixed and Non-premixed Flame Propagation and Suppression
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Premixed and Non-premixed Flame Propagation and Suppression

A special issue of Fire (ISSN 2571-6255).

Deadline for manuscript submissions: closed (31 January 2024) | Viewed by 6997

Special Issue Editors

Dr. Xuehui Wang

E-Mail Website
Guest Editor
State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, China
Interests: dynamic evolution of pool fire; fire numerical simulation; fire investigation technique
Special Issues, Collections and Topics in MDPI journals
Dr. Qinpei Chen

E-Mail Website
Guest Editor
Tianjin Fire Science and Technology Research Institute of MEM, Tianjin 300381, China
Interests: fire dynamics theory; fire risk assessment; boilover fires; lithium-ion battery fire

Special Issue Information

Dear Colleagues,

Premixed flames and non-premixed flames are the typical flames inside combustion. Many practical combustion and fire suppression conditions, such as diesel engines, liquid rocket motors, liquid pool fires, and gas explosions, involve two types of flames. Propagation and suppression is a basic phenomenon of flame that involve chemical reaction fluid dynamics, heat transfer, and chemical reactions, which is the important characteristics of flame. With the increasing demand for cleaner combustion processes and high-performance fire suppression methods, an in-depth understanding of flame propagation and suppression is demanded to improve combustion efficiency in the field of energy usage and enhance the ability of fire prevention and control.

This Special Issue aims to the development and validation of reaction kinetics, understand reaction/suppression mechanisms, and modeling of combustion and suppression. We encourage papers on flames in different combustion systems, such as buoyancy diffuse flames, planner flames, co-flow diffusion flames, etc. Papers on the application of advances in diagnostic and computational methods in flames and flame suppression mechanisms are also encouraged. In particular, research on low pressure and low oxygen fires are also encouraged.

We look forward to receiving your contributions.

Dr. Xuehui Wang
Dr. Qinpei Chen
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Fire is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • premixed flame
  • non-premixed propagation
  • flame dynamics
  • fire suppression
  • liquid and boilover fire

Published Papers (4 papers)

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Research

12 pages, 3047 KiB  
Article
The Study of Hydrogen Volume Fraction Effects on the Flame Temperature of Turbulence Diffusion Propane Jet Flames
by Bingchuan Yan, Chao Sun, Qingshan Feng, Jian Chen, Yuke Gao and Changfa Tao
Fire 2024, 7(1), 10; https://doi.org/10.3390/fire7010010 - 25 Dec 2023
Viewed by 1325
Abstract
This paper studies the influence of hydrogen volume fraction effects on the temperature distribution of diffusion turbulent propane jet flames. Numbers of experimental scenarios have been carried out to investigate the evolution of temperature distribution under different hydrogen volume fractions. In the continuous [...] Read more.
This paper studies the influence of hydrogen volume fraction effects on the temperature distribution of diffusion turbulent propane jet flames. Numbers of experimental scenarios have been carried out to investigate the evolution of temperature distribution under different hydrogen volume fractions. In the continuous region, these experimental results show that the temperature distribution and the maximum temperature of diffusion of turbulent jet flames are proportional to the hydrogen volume fraction under the same heat release rate of propane. Considering the model of virtual point source and the three-stage model, the theoretical model between the hydrogen volume fraction and flame temperature has been analyzed. The relationship among the temperature distribution, hydrogen volume fraction, and heat release rate has been modified. It can provide some important references for the fire risk assessment of turbulent diffusion jet flames. Full article
(This article belongs to the Special Issue Premixed and Non-premixed Flame Propagation and Suppression)
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15 pages, 17486 KiB  
Article
Denoising of Images for Temperature and Chemiluminescence Measurements of Premixed Flames Applying the Abel Transform
by J. C. I. Zamarripa-Ramírez, D. Moreno-Hernández and A. Martinez Gonzalez
Fire 2023, 6(11), 437; https://doi.org/10.3390/fire6110437 - 15 Nov 2023
Viewed by 1433
Abstract
The temperature field and chemiluminescence measurements of axisymmetric flame are obtained simultaneously in only one image. Digital Laser Speckle Displacement measures temperature fields, and direct image flame determines chemiluminescence values. Applying the Abel transform of axisymmetric objects for volume visualization requires smooth intensity [...] Read more.
The temperature field and chemiluminescence measurements of axisymmetric flame are obtained simultaneously in only one image. Digital Laser Speckle Displacement measures temperature fields, and direct image flame determines chemiluminescence values. Applying the Abel transform of axisymmetric objects for volume visualization requires smooth intensity profiles. Due to the nature of the experimental setup, direct image flame is corrupted with speckle noise and a crosstalk effect. These undesirable effects deteriorate the measurement results. Then, experimental data need crosstalk correction and speckle noise reduction to improve the measurements. This work aims to implement a methodology to reduce the speckle noise of highly noisy data intensity profiles to create smooth profiles appropriate to applying the Abel transform. The method uses a Four-Order Partial Differential Equation to reduce speckle noise and a Curve fitting utilizing a set of Gaussian functions to decrease residual undesirable effects. After this, correction of crosstalk is necessary to avoid this effect. The methodology is applied to premixed flames generated with Liquid Petroleum Gas for different mixes. Full article
(This article belongs to the Special Issue Premixed and Non-premixed Flame Propagation and Suppression)
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23 pages, 9159 KiB  
Article
Assessment of a Differential Subgrid Stress Model for Large-Eddy Simulations of Turbulent Unconfined Swirling Flames
by Roman Balabanov, Lev Usov, Anton Nozdrachev, Alexei Troshin, Vladimir Vlasenko and Vladimir Sabelnikov
Fire 2023, 6(3), 94; https://doi.org/10.3390/fire6030094 - 28 Feb 2023
Cited by 1 | Viewed by 1140
Abstract
Swirling flames are widely used in engineering to intensify mixing and stabilize combustion in gas turbine power plants and industrial burners. Swirling induces new instability modes, leading to intensification of coherent structures, asymmetric geometry, vortex core precession, and flame oscillations. Large-Eddy Simulation (LES) [...] Read more.
Swirling flames are widely used in engineering to intensify mixing and stabilize combustion in gas turbine power plants and industrial burners. Swirling induces new instability modes, leading to intensification of coherent structures, asymmetric geometry, vortex core precession, and flame oscillations. Large-Eddy Simulation (LES) has the capability to furnish more accurate and reliable results than the simulations based on Reynolds-averaged Navier–Stokes equations (RANS). Subgrid-scale models in LES need to describe the backscatter (local transfer of kinetic energy from small scales to larger scales) that is intensified in swirling flames. In this paper, the Differential Subgrid Stress Model (DSM), previously developed by the authors, is assessed using an experimental database from Sydney University on swirl-stabilized turbulent unconfined non-premixed methane-air flame. Regime without vortex precession is simulated numerically using the DSM and Smagorinsky subgrid-scale model. Experimental measurements of mean velocity, profiles of mass fractions, and temperature are used for comparison with the simulation data. The standard Smagorinsky model is considered the basic approach. Differences in the flow field statistics obtained in both subgrid-scale LES models are analyzed and discussed. The importance of taking the backscatter into account is highlighted. Full article
(This article belongs to the Special Issue Premixed and Non-premixed Flame Propagation and Suppression)
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12 pages, 5415 KiB  
Article
Effects of n-Butanol Addition on the Combustion Characteristics of n-Heptane Counterflow Diffusion Flame at Elevated Pressure
by Yaoyao Ying and Dong Liu
Fire 2022, 5(5), 154; https://doi.org/10.3390/fire5050154 - 30 Sep 2022
Cited by 2 | Viewed by 1613
Abstract
This study focused on the effects of n-butanol addition on the combustion characteristics of n-heptane counterflow diffusion flame under pressures of 1, 3, and 5 atm by a detailed kinetic simulation. The added n-butanol volume fraction ranged from 0 to [...] Read more.
This study focused on the effects of n-butanol addition on the combustion characteristics of n-heptane counterflow diffusion flame under pressures of 1, 3, and 5 atm by a detailed kinetic simulation. The added n-butanol volume fraction ranged from 0 to 50%. The mass averaged velocity of fuel streams was selected to ensure momentum flux balance and was approximately constant for the investigated flames. Flame structures and mole fraction profiles impacted by n-butanol addition for major species, free radicals, and intermediate species were analyzed by concentrating on the formations of soot precursors and oxygenated air pollutants. The results showed that with the addition of n-butanol, the flame temperature decreased and the formation of the main soot precursors such as C2H2 and C6H6 was inhibited. This can be attributed to the reduced rate of production of these species. The flame temperature increased significantly, and the profile moved towards the fuel side with the increasing pressure. Moreover, the production of C2H2 and C6H6 was observably promoted as the pressure increased. The concentrations of free radical H, O, and OH decreased significantly as the pressure increased but slightly decreased with the increasing n-butanol addition, which might have been caused by the chemical effect of n-butanol. Full article
(This article belongs to the Special Issue Premixed and Non-premixed Flame Propagation and Suppression)
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