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Applied Sciences
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Advanced Internal Combustion Engines and Fuel Technologies
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Advanced Internal Combustion Engines and Fuel Technologies

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Mechanical Engineering".

Deadline for manuscript submissions: closed (20 March 2024) | Viewed by 898

Special Issue Editors

Prof. Dr. Jun Cong Ge

E-Mail Website
Guest Editor
Division of Mechanical Design Engineering, Jeonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju-si, Jeollabuk-do 54896, Republic of Korea
Interests: alternative fuels; diesel engine; combustion; emission; particle morphology
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Jun Hee Song

E-Mail Website
Guest Editor
Department of Convergence Technology Engineering and Department of Energy Storage, Jeonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju-si, Jeollabuk-do 54896, Republic of Korea
Interests: superfiber materials; fiber-reinforced polymer; polymer-matrix composites; mechanical properties; hybrid superfiber applications
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

In order to reduce greenhouse gas emissions and urban air pollution, scientists from around the world are working diligently to develop advanced internal combustion engines (ICEs) and fuel technologies. Although electric vehicles (EVs) do not emit any exhaust emissions during driving, they are also related to harmful emissions such as nitrogen oxides (NOx) and sulfides, as well as carbon dioxide (CO2), based on their life cycle assessment (LCA). This is because most countries still rely on consuming a large amount of coal and fossil fuels for electricity production. Therefore, improving the thermal efficiency of traditional ICEs and developing advanced ICE technologies are of great significance in reducing the consumption of fossil fuels, harmful exhaust emissions, and CO2 emissions. This is especially important for the improvement of traditional diesel engines, because diesel engines have an irreplaceable position in fields such as transportation, ships, agricultural machinery, and construction machinery. Relevant experts point out that increasing the thermal efficiency of ICEs to over 50% while reducing exhaust emissions to below 90% would provide a great advantage in competing with EVs. On the other hand, advanced fuels such as electrofuels (E-fuels), hydrogenated vegetable oil (HVO), hydrogen (H2), ammonia, and other low-carbon fuels have great application potential in reducing harmful exhaust emissions and CO2 from ICEs. Therefore, for further discussion, we share this Special Issue with colleagues at home and abroad to discuss the latest research on advanced ICEs, new alternative fuels, and related advanced technologies

Prof. Dr. Jun Cong Ge
Prof. Dr. Jun Hee Song
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. Applied Sciences 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 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

  • internal combustion engine
  • thermal efficiency
  • new alternative fuels
  • low-carbon fuels
  • CO2 emissions
  • combustion and emissions

Published Papers (1 paper)

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Research

17 pages, 13125 KiB  
Article
Self-Excited Thermoacoustic Instability Behavior of a Hedge Premixed Combustion System with an Asymmetric Air/Fuel Supply or Combustion Condition
by Yongbo Du, Yuanhang Zhang, Xiaojin Li, Jingkun Zhang, Yaodong Da, Yun Jia and Defu Che
Appl. Sci. 2023, 13(20), 11463; https://doi.org/10.3390/app132011463 - 19 Oct 2023
Cited by 1 | Viewed by 689
Abstract
Self-excited thermoacoustic instability (SETAI) is an undesirable and dangerous phenomenon in combustion systems. However, its control is difficult, thus greatly limiting the development of combustion technology. Our previous works clarified how the premixed chamber length (LP) and equivalence ratio ( [...] Read more.
Self-excited thermoacoustic instability (SETAI) is an undesirable and dangerous phenomenon in combustion systems. However, its control is difficult, thus greatly limiting the development of combustion technology. Our previous works clarified how the premixed chamber length (LP) and equivalence ratio (φ) influence SETAI behavior in a symmetrical hedge premixed combustion system. On real-world sites, however, the supply structure or combustion condition in a multi-flame system could be asymmetric due to space limitations or combustion adjustment needs. This paper aims to clarify the SETAI behavior of a combustion system with an asymmetric supply structure or an asymmetric combustion condition. The results indicate that the sound pressure amplitude under strong oscillation can reach 160 dB, which is about 5% of the total pressure. The SETAI state under the asymmetric condition is determined by the coupling between the heat release oscillation and sound pressure oscillation on each side and their cooperation. The asymmetric supply structure leads to asynchronous heat release oscillations between the two sides; it may be that one promotes oscillation and that the other suppresses it, or that both have a promotion effect but with asynchronous action, thus partly canceling each other out to lower the system’s oscillation intensity. This brings an advantage for controlling SETAI, which can be achieved by only changing one side of the structure. The oscillation amplitude can be reduced by 80–90% by appropriately changing one LP only by ~20%. Under an asymmetric combustion condition with φ differing between the two sides, the heat release oscillation on each side is dependent on the local φ but not the global φ. Consequently, SETAI can also be controlled by changing the distribution but maintaining a constant fuel feeding rate and φ. The concepts identified in this paper demonstrate that SETAI can be effectively controlled by adopting an asymmetric φ distribution or an asymmetric structure of the supply system. This provides a convenient SETAI control approach without affecting the equipment’s thermal performance. Full article
(This article belongs to the Special Issue Advanced Internal Combustion Engines and Fuel Technologies)
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