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Energies
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Challenges and Research Trends of Combustion Mechanism
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Challenges and Research Trends of Combustion Mechanism

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "I2: Energy and Combustion Science".

Deadline for manuscript submissions: closed (30 November 2021) | Viewed by 8479
Submit your paper and select the Journal "Energies" and the Special Issue "Challenges and Research Trends of Combustion Mechanism" via: https://susy.mdpi.com/user/manuscripts/upload?journal=energies. Please contact the guest editor or the journal editor ([email protected]) for any queries.

Special Issue Editor

Prof. Dr. Erjiang Hu

E-Mail Website
Guest Editor
Institute of Internal Combustion Engine, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China
Interests: : flame dynamics; plasma assistant ignition and combustion; combustion mechanism; laser diagnostic; alternative fuels; engine combustion

Special Issue Information

Dear Colleagues,

The energy landscape in the world is in a constant state of change. Nevertheless, due to the development of oil extraction technologies, oil remains the world’s dominant source of energy for engines and is expected to stay so for the foreseeable future. Energy combustion is of great importance to the engine industry, and thus, accurate chemical kinetic mechanisms of fuel are required for the simulation of modern engine combustion. Therefore, the combustion mechanism of actual fuels and alternative fuels is essential for the combustion chamber design of high-efficiency and low-emission advanced engines. A deep understanding of the combustion mechanism can contribute to the optimization of engine combustor design, exploration of pollutant formation mechanism, shortening of the development cycle, and reduction of research cost. Therefore, it is a great challenge to investigate the combustion mechanism in different conditions.

This Special Issue of Energies seeks articles that focus on flame dynamics, plasma and laser ignition, catalytic conversion, combustion mechanism, laser diagnostic, alternative fuels, the chemical kinetic model, as well as combustion and emission of burners and engines.

Prof. Dr. Erjiang Hu
Guest Editor

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. Energies is an international peer-reviewed open access semimonthly 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 2600 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

  • Flame dynamics
  • Plasma and laser ignition
  • Catalytic conversion
  • Combustion mechanism
  • Laser diagnostic
  • Alternative fuels
  • Chemical kinetic model
  • Combustion and emission of burners and engines

Published Papers (5 papers)

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Research

13 pages, 2548 KiB  
Article
Explosive Burning of a Mechanically Activated Al and CuO Thermite Mixture
by Alexander Dolgoborodov, Boris Yankovsky, Sergey Ananev, George Valyano and Galina Vakorina
Energies 2022, 15(2), 489; https://doi.org/10.3390/en15020489 - 11 Jan 2022
Cited by 5 | Viewed by 1430
Abstract
The results of experiments to determine the role of structural schemes for the ignition of a mechanically activated thermite mixture Al–CuO and the formation of its combustion flame are presented. The reaction initiated in the bulk of the experimental assembly transforms into torch [...] Read more.
The results of experiments to determine the role of structural schemes for the ignition of a mechanically activated thermite mixture Al–CuO and the formation of its combustion flame are presented. The reaction initiated in the bulk of the experimental assembly transforms into torch combustion in an open space. The dynamics of the volume of the flame reaction region was determined. The stage of flame formation has a stochastic character, determined by the random distribution of the reaction centres in the initial volume of the components. A high-speed camera, a pyrometer and electro contact sensors were used as diagnostic tools. The ultimate goal of the study was to optimize the conditions for the flame formation of this mixture for its effective use with a single ignition of various gas emissions. Full article
(This article belongs to the Special Issue Challenges and Research Trends of Combustion Mechanism)
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17 pages, 6122 KiB  
Article
Shock Wave Propagation and Flame Kernel Morphology in Laser-Induced Plasma Ignition of CH4/O2/N2 Mixture
by Junjie Zhang, Erjiang Hu, Qunfei Gao, Geyuan Yin and Zuohua Huang
Energies 2021, 14(23), 7976; https://doi.org/10.3390/en14237976 - 29 Nov 2021
Cited by 3 | Viewed by 1485
Abstract
The application of laser ignition in the aerospace field has promising prospects. Based on the constant volume combustion chamber, the laser ignition of CH4/O2/N2 mixture with different initial pressure, different laser energy, different equivalence ratio and different oxygen [...] Read more.
The application of laser ignition in the aerospace field has promising prospects. Based on the constant volume combustion chamber, the laser ignition of CH4/O2/N2 mixture with different initial pressure, different laser energy, different equivalence ratio and different oxygen content has been carried out. The development characteristics of the flame kernel and shock wave under different conditions are analyzed. In addition, the Taylor model and Jones model are also used to simulate the development process of the shock wave, and a new modified model is proposed based on the Jones model. The experimental results show that under pure oxygen conditions, the chemical reaction rate of the mixture is too fast, which makes it difficult for the flame kernel to form the ring and third-lobe structure. However, the ring structure is easier to form with the pressure and laser energy degraded; the flame kernel morphology is easier to maintain at a rich equivalence ratio, which is caused by the influence of the movement of hot air flow and a clearer boundary between the ring and the third-lobe. The decrease of the initial pressure or the increase of the laser energy leads to the increase in shock wave velocity, while the change of the equivalence ratio and oxygen content has less influence on the shock wave. Full article
(This article belongs to the Special Issue Challenges and Research Trends of Combustion Mechanism)
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13 pages, 3762 KiB  
Article
Experimental Study on Ignition Characteristics of RP-3 Jet Fuel Using Nanosecond Pulsed Plasma Discharge
by Xiaoyang Guo, Erjiang Hu, Xiaotian Li, Geyuan Yin and Zuohua Huang
Energies 2021, 14(20), 6463; https://doi.org/10.3390/en14206463 - 9 Oct 2021
Cited by 1 | Viewed by 1464
Abstract
A study on forced ignition characteristics of RP-3 jet fuel-air mixture was conducted around a constant volume combustion vessel and a nanosecond pulsed plasma discharge power supply. Experiments were carried out at different initial pressures (pu = 0.2, 0.3, 0.5 atm), [...] Read more.
A study on forced ignition characteristics of RP-3 jet fuel-air mixture was conducted around a constant volume combustion vessel and a nanosecond pulsed plasma discharge power supply. Experiments were carried out at different initial pressures (pu = 0.2, 0.3, 0.5 atm), equivalence ratios (ϕ = 0.7, 0.8, 1.1), steam concentrations (ZH2O = 0%, 10%, 15%) and oxygen concentrations (ZO2 = 13.5%, 16%, 21%). The relationship between ignition probability and ignition energy is investigated. The experimental results show that the decrease in pressure, equivalence ratio, oxygen concentration and the increase in steam concentration all lead to an increase in minimum ignition energy (MIE). In order to further analyze the experimental data, one existing fitting equation is reformed with the initial conditions taken into account. Multivariate fitting is carried out for different conditions, and the fitting results of ignition probability are in good agreement with the experiments. The MIE results under different experimental conditions are figured out with the new fitting equation. The impact indexes, which stand for the effects of different factors, are also calculated and compared in present work. Full article
(This article belongs to the Special Issue Challenges and Research Trends of Combustion Mechanism)
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16 pages, 5226 KiB  
Article
Experimental and Numerical Study on the Sooting Behaviors of Furanic Biofuels in Laminar Counterflow Diffusion Flames
by Qianqian Mu, Fuwu Yan, Jizhou Zhang, Lei Xu and Yu Wang
Energies 2021, 14(18), 5995; https://doi.org/10.3390/en14185995 - 21 Sep 2021
Cited by 2 | Viewed by 1672
Abstract
Furanic biofuels have received increasing research interest over recent years, due to their potential in reducing greenhouse gas emissions and mitigating the production of harmful pollutants. Nevertheless, the heterocyclic structure in furans make them readily to produce soot, which requires an in-depth understanding. [...] Read more.
Furanic biofuels have received increasing research interest over recent years, due to their potential in reducing greenhouse gas emissions and mitigating the production of harmful pollutants. Nevertheless, the heterocyclic structure in furans make them readily to produce soot, which requires an in-depth understanding. In this study, the sooting characteristic of several typical furanic biofuels, i.e., furan, 2-methylfuran (MF), and 2,5-dimethylfuran (DMF), were investigated in laminar counterflow flames. Combined laser-based soot measurements with numerical analysis were performed. Special focus was put on understanding how the fuel structure of furans could affect soot formation. The results show that furan has the lowest soot volume fraction, followed by DMF, while MF has the largest value. Kinetic analyses revealed that the decomposition of MF produces high amounts of C3 species, which are efficient benzene precursors. This may be the reason for the enhanced formation of polycyclic aromatic hydrocarbons (PAHs) and soot in MF flames, as compared to DMF and furan flames. The major objectives of this work are to: (1) understand the sooting behavior of furanic fuels in counterflow flames, (2) elucidate the fuel structure effects of furans on soot formation, and (3) provide database of quantitative soot concentration for model validation and refinements. Full article
(This article belongs to the Special Issue Challenges and Research Trends of Combustion Mechanism)
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11 pages, 2252 KiB  
Article
Ignition Thresholds and Flame Propagation of Methane/Air Mixtures Ignited via Radiatively Heated Inert Particles
by Junrong Ma and Changsuo Zhang
Energies 2021, 14(16), 5173; https://doi.org/10.3390/en14165173 - 21 Aug 2021
Cited by 1 | Viewed by 1584
Abstract
The prevention and evaluation of explosions requires suitable standards of measurement. As such, for this study two ignition thresholds, the ignition temperature and the minimum ignition irradiance were selected as the assessment criteria. These ignition threshold values were experimentally determined by heating stationary [...] Read more.
The prevention and evaluation of explosions requires suitable standards of measurement. As such, for this study two ignition thresholds, the ignition temperature and the minimum ignition irradiance were selected as the assessment criteria. These ignition threshold values were experimentally determined by heating stationary inert silicon carbide particles via thermal radiation with a large spot size in order to ignite quiescent methane-air fuel mixtures. A high-speed Schlieren camera was used to capture the progression of the formation and propagation of the flames throughout the experiments. The results of the experiments show that the irradiance and temperature threshold are directly and inversely proportional to the particle size, respectively. Furthermore, the irradiance and temperature thresholds have similar tendencies within the flammability limits; wherein, the minimum value corresponds to fuel mixtures at a stoichiometric ratio, and increases as the equivalence ratio shifts toward the flammability limits. Irradiance thresholds, though, are more sensitive to changes in equivalence ratio than temperature. The temperature histories of the heated particle determined that when the irradiance is lower than its ignition threshold value, the heated particle-fuel mixture system will arrive at a thermal equilibrium, rather than ignition, due to the inability of the particle to reach the ignition temperature. This study also found that longer ignition times will result in a more drastic deformation of the flame fronts caused by natural convection. Full article
(This article belongs to the Special Issue Challenges and Research Trends of Combustion Mechanism)
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