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Advances in Combustion Strategies and Fuels for Sustainable Energy and Propulsion

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

Deadline for manuscript submissions: 10 February 2026 | Viewed by 2437

Special Issue Editors

Dr. Annarita Viggiano

E-Mail Website
Guest Editor
Department of Engineering, Università degli Studi della Basilicata, Potenza, Italy
Interests: fluid dynamics; turbulence; combustion; propulsion; internal combustion engines; renewable fuels; zero-carbon fuels; waste heat recovery; CFD
Prof. Dr. Vinicio Magi

E-Mail Website1 Website2
Guest Editor
Department of Engineering, Università degli Studi della Basilicata, Potenza, Italy
Interests: incompressible and compressible fluid mechanics; turbulent reacting flows; sprays; combustion modeling; thermal engines; CFD
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Nowadays, it is mandatory to promote scientific research towards efficient and low-carbon energy and propulsion systems. This is related to the efforts to meet climate neutrality and a sustainable usage of resources to satisfy an increasing global energy demand. Many power generation technologies are still based on the combustion of fossil fuels; therefore, a revolutionary innovation of such technologies is needed for this epochal turning point in the industrial sector.

This Special Issue aims to present recent advances in combustion strategies with a strong shifting from standard fuels to biofuels and e-fuels for the energy generation and transportation sectors, with the aim to decarbonize and increase sustainability. Indeed, recent advances in emerging technologies can potentially result in the production and use of fuels tailored to improve combustion efficiency and reduce emissions. The assessment of these benefits will be published in this Special Issue based on in-depth studies under conditions relevant to industrial and transportation applications.

Both numerical and experimental studies with original results are welcome, as well as the description and application of innovative methods and techniques. In addition, researchers are invited to contribute comprehensive and critical reviews of the scientific literature in the field.

Dr. Annarita Viggiano
Prof. Dr. Vinicio Magi
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

  • e-fuels
  • biofuels
  • combustion
  • emissions
  • efficiency
  • sustainability
  • decarbonization
  • energy systems
  • propulsion systems
  • numerical methods
  • experimental techniques

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Published Papers (2 papers)

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23 pages, 8186 KB  
Article
On the Influence of H2 Addition on NH3 Laminar Flame Speed under Engine-like Conditions
by Flavio Bochicchio, Marco D’Amato, Vinicio Magi and Annarita Viggiano
Energies 2024, 17(16), 4181; https://doi.org/10.3390/en17164181 - 22 Aug 2024
Cited by 2 | Viewed by 1215
Abstract
As zero-carbon fuels, hydrogen and ammonia are of great interest in the transition toward a climate-neutral transportation system. In order to use these fuels and their blends in reciprocating engines, a characterization of the combustion of NH3/H2/air mixtures at [...] Read more.
As zero-carbon fuels, hydrogen and ammonia are of great interest in the transition toward a climate-neutral transportation system. In order to use these fuels and their blends in reciprocating engines, a characterization of the combustion of NH3/H2/air mixtures at high pressures and temperatures is needed. The aim of this work is to compute the Laminar Flame Speed (LFS) of NH3/H2/air mixtures by varying the thermochemical conditions of the reactants. For this purpose, several simulations have been carried out using different kinetic reaction mechanisms. The accuracy of the model has been assessed by comparing the results with experimental data available in the scientific literature. Finally, the influence of mixture composition and thermodynamic conditions of the reactants on LFS has been assessed by considering temperature and pressure values relevant to automotive applications and not yet explored in the literature. By adding H2 to NH3/air mixtures, LFS increases exponentially. By plotting the logarithm of LFS as a function of the H2 mole fraction, the numerical results are well fitted by using a second-degree polynomial regression. However, a linear regression is accurate enough if the H2 mole fraction does not exceed 0.6. Regarding the effect of pressure, the decrease in LFS with increasing pressure is less important as pressure increases. On the other hand, LFS increases with temperature, and this effect is more pronounced as the H2 mole fraction decreases and pressure increases. Full article
(This article belongs to the Special Issue Advances in Combustion Strategies and Fuels for Sustainable Energy and Propulsion)
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Review

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22 pages, 4651 KB  
Review
Potential Issues and Optimization Solutions for High-Compression-Ratio Utilization in Hybrid-Dedicated Gasoline Engines
by Qiuyu Liu, Baitan Ma, Zhiqiang Zhang, Chunyun Fu and Zhe Kang
Energies 2025, 18(15), 4204; https://doi.org/10.3390/en18154204 - 7 Aug 2025
Viewed by 411
Abstract
This systematic review critically examines the benefits and challenges of high-compression-ratio (CR) implementation in hybrid-dedicated engines, recognizing CR increase as a pivotal strategy for enhancing the indicated thermal efficiency to achieve carbon peak and carbon neutrality goals. However, excessively high CRs face critical [...] Read more.
This systematic review critically examines the benefits and challenges of high-compression-ratio (CR) implementation in hybrid-dedicated engines, recognizing CR increase as a pivotal strategy for enhancing the indicated thermal efficiency to achieve carbon peak and carbon neutrality goals. However, excessively high CRs face critical constraints, including intensified knock propensity, increased heat transfer (HTR) losses, reduced combustion stability, augmented dissociation losses, and cold-start misfire risks. The feasibility and necessity of CR enhancement in hybrid systems were comprehensively evaluated based on these factors, with fundamental mechanisms of the detrimental effects elucidated. To address these challenges, optimized countermeasures were synthesized: knock suppression via high-octane fuels, EGR technology, lean combustion, and in-cylinder water injection; heat transfer reduction through thermal barrier coatings and independent CR/expansion-ratio control; misfire risk monitoring using ion current or cylinder pressure sensors. These approaches provide viable pathways to overcome high-CR limitations and optimize engine performance. Nevertheless, current research remains confined to isolated solutions, warranting future focus on integrated optimization mechanisms investigating synergistic interactions of multiple strategies under high-CR conditions. Full article
(This article belongs to the Special Issue Advances in Combustion Strategies and Fuels for Sustainable Energy and Propulsion)
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