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Recent Advances in Energy Combustion and Flame
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Recent Advances in Energy Combustion and Flame

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

Deadline for manuscript submissions: 5 June 2025 | Viewed by 2598

Special Issue Editors

Prof. Dr. Xianchang Li

E-Mail Website
Guest Editor
Department Mechanical Engineering, Lamar University, Beaumont, TX 77710, USA
Interests: heat transfer; thermodynamics; turbomachinery
Special Issues, Collections and Topics in MDPI journals
Dr. Pritam Dey

E-Mail Website
Guest Editor
Department of Mechanical Engineering, Lamar University, Beaumont, TX 77710, USA
Interests: computational fluid dynamics; turbomachinery; combustion; renewable fuel

Special Issue Information

Dear Colleagues,

Energy and combustion play a crucial role in forming our world, impacting nearly every facet of our lives. From the energy that powers our home to the transportation that takes us to places, this field underpins all fundamental elements of modern society. Even though it is rooted in fundamentals, with innovations and technological advancements, researchers are identifying new areas every day to improve legacy technologies and discover something new and inspiring. Also, challenges such as clean–sustainable power generation and environmental hazards due to combustion have attracted scholarly attention across the world, with more researchers making exciting breakthroughs. This Special Issue will highlight recent findings on energy and combustion research and their potential to address global challenges related to energy security, environmental pollution, and climate change.

We invite original research articles, review papers, and technical communications covering, but not limited to, the following areas:

  • Fundamental combustion phenomena: turbulent combustion, flame chemistry, soot formation and control, pollutant emissions, advanced diagnostics, and flame propagation and stabilization;
  • Innovative combustion technologies: oxy-fuel combustion, chemical looping combustion, plasma-assisted combustion, pulse detonation combustion, micro-combustion, humidified combustion, and lean combustion;
  • Computational modeling and simulation: flame modelling, soot prediction, CFD simulations, and machine learning for combustion analysis;
  • Combustion applications: clean and efficient combustion in engines (gas turbines, internal combustion engines), boilers, furnaces, and industrial burners;
  • Renewable fuels and alternative combustion strategies: Biofuels, hydrogen combustion, ammonia combustion, and biomass gasification;
  • Flame-based technologies: material synthesis, plasma processing, and thermal decomposition processes.

Prof. Dr. Xianchang Li
Dr. Pritam Dey
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. 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
  • engines
  • renewable fuel
  • combustion modeling
  • emissions control

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Published Papers (3 papers)

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Research

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13 pages, 7220 KiB  
Article
Experimental Study on Chemiluminescence Properties of Ammonia-Methane Non-Premixed Laminar Flames
by Haihang Su, Yuxuan Wu, Jinzhi Yan and Liqiao Jiang
Energies 2025, 18(2), 402; https://doi.org/10.3390/en18020402 - 17 Jan 2025
Viewed by 721
Abstract
The fundamental investigation on the chemiluminescence characteristics of NH3-based flames is essential for the development of low-cost, real-time optical diagnostic sensor technologies. In this study, we have experimentally examined the chemiluminescence properties of non-premixed ammonia-methane laminar jet flames under various initial [...] Read more.
The fundamental investigation on the chemiluminescence characteristics of NH3-based flames is essential for the development of low-cost, real-time optical diagnostic sensor technologies. In this study, we have experimentally examined the chemiluminescence properties of non-premixed ammonia-methane laminar jet flames under various initial NH3 blending ratios (XNH3 from 0.2 to 1.0 in volume) by conducting the emission spectrum analysis within the 200–800 nm band and capturing the distribution images of key excited radicals. The results revealed that the emission spectra of OH*, CH*, CN*, NH*, and NH2* were clearly identifiable. As anticipated, the chemiluminescence characteristics of NH3-CH4 non-premixed flames were significantly influenced by XNH3; i.e., the overall signal intensity decreased monotonically within the 200–400 nm band but increased within the 400–800 nm band as XNH3 increased. The signal intensity characteristics of OH*, CH*, NH*, and NH2*, indicated by radical images, were consistent with the spectrometer measurements. Particularly, it was found that the intensity ratio of CH*/NH2* was an ideal marker of initial XNH3 in present flames, given their sensitivity with XNH3 and relative ease of measurement with the cost-effective sensors designed for invisible wavelengths. Moreover, in the flame front, CH* was located in the oxidant side, while NH2* was in the fuel side with a broader distribution zone. An increase of XNH3 led to greater flame thickness and shifted the peak position of excited radicals far away from the fuel side. Full article
(This article belongs to the Special Issue Recent Advances in Energy Combustion and Flame)
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23 pages, 11941 KiB  
Article
Investigation of the Effects of Hydrogen Addition on Explosion Characteristics and Pressure Fluctuations of Ethyl Acetate
by Ce Liang, Xiaolu Li, Cangsu Xu, Francis Oppong, Yangan Bao, Yuan Chen, Yuntang Li, Bingqing Wang and Jiangqin Ge
Energies 2024, 17(23), 5970; https://doi.org/10.3390/en17235970 - 27 Nov 2024
Cited by 1 | Viewed by 681
Abstract
This study systematically explored the characteristics of explosion and pressure fluctuations of ethyl acetate (EA)/hydrogen (H2)/air mixtures under different initial pressures (1–3 bar), H2 fractions (4%, 8%, 12%), and equivalence ratios of EA (0.5–1.4). The flame images indicated that a [...] Read more.
This study systematically explored the characteristics of explosion and pressure fluctuations of ethyl acetate (EA)/hydrogen (H2)/air mixtures under different initial pressures (1–3 bar), H2 fractions (4%, 8%, 12%), and equivalence ratios of EA (0.5–1.4). The flame images indicated that a higher pressure, a higher H2 fraction, and a higher equivalence ratio could cause flame instability. An analysis of the dimensionless growth rate indicated that the flame instability was impacted by both thermal diffusion and hydrodynamic effects. The results also indicated that a higher initial pressure or H2 fraction could accelerate the combustion reaction and increase the explosion pressure and deflagration index. The maximum values were observed at 21.841 bar and 184.153 bar·m/s. However, their effects on explosion duration and heat release characteristics differed between lean and rich mixtures. Additionally, this study examined pressure fluctuations in both the time and frequency domains. The findings indicated a strong correlation between pressure fluctuation and flame instability. Modifying the H2 fraction and equivalence ratio to enhance flame stability proved effective in reducing pressure fluctuation amplitude. This study offers guidance for evaluating explosion risks associated with EA/H2/air mixtures and for designing related combustion devices. Full article
(This article belongs to the Special Issue Recent Advances in Energy Combustion and Flame)
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Review

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18 pages, 950 KiB  
Review
Advances and Challenges in Thermoacoustic Network Modeling for Hydrogen and Ammonia Combustors
by Seungmin Guk, Jaehoon Lee, Juwon Kim and Minwoo Lee
Energies 2025, 18(2), 346; https://doi.org/10.3390/en18020346 - 14 Jan 2025
Viewed by 695
Abstract
The transition to low-carbon energy systems has heightened interest in hydrogen and ammonia as sustainable alternatives to traditional hydrocarbon fuels. However, the development and operation of combustors utilizing these fuels, like other combustion systems, are challenged by thermoacoustic instabilities arising from the interaction [...] Read more.
The transition to low-carbon energy systems has heightened interest in hydrogen and ammonia as sustainable alternatives to traditional hydrocarbon fuels. However, the development and operation of combustors utilizing these fuels, like other combustion systems, are challenged by thermoacoustic instabilities arising from the interaction between unsteady heat release and acoustic wave oscillations. Among many different methods for studying thermoacoustic instabilities, thermoacoustic network models have played an important role in analyzing the essential dynamics of these instabilities in combustors operating with low-carbon fuels. This paper provides a comprehensive review of thermoacoustic network modeling techniques, focusing specifically on their application to hydrogen- and ammonia-based combustion systems. We outline the key mathematical frameworks derived from fundamental equations of motion, along with experimental validations and practical applications documented in existing studies. Furthermore, current research gaps are identified, and future directions are proposed to improve the reliability and effectiveness of thermoacoustic network models, contributing to the advancement of efficient and stable low-carbon combustors. Full article
(This article belongs to the Special Issue Recent Advances in Energy Combustion and Flame)
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