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Energies
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Combustion Performance, Thermal Conductivity and Efficiency
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Combustion Performance, Thermal Conductivity and Efficiency

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 (20 December 2022) | Viewed by 6826

Special Issue Editors

Prof. Dr. Gojmir Radica

E-Mail Website
Guest Editor
Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, University of Split, Rudjera Boškovića 32, 21000 Split, Croatia
Interests: testing; diagnostic; cogeneration systems; modelling; optimization; energy efficiency; marine engineering, and hybrid systems; conducting energy audits of buildings, including audits of heating and air conditioning installations in buildings, as well as renewable energy implementation and emission measurements
Special Issues, Collections and Topics in MDPI journals
Dr. Željko Penga

E-Mail Website1 Website2
Guest Editor
Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, University of Split, Rudjera Boškovića 32, 21000 Split, Croatia
Interests: fuel cells; computational fluid dynamics; mathematical modeling; flow field design; dynamic models of fuel cells; continuum models; water and heat management; temporally and spatially resolved fuel cell performance monitoring; development of novel sensors and monitoring equipment for fuel cells; graded design of fuel cells; engineering thermodynamics; hydrogen energy
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The aim of this Special issue is to explore the influence parameters for improving the combustion stability and enhancing heat transfer in combustion chamber. High thermal conductivity materials can realize uniform high heat flux output of combustion chamber wall. The materials with high thermal conductivity can improve the average temperature and heat flux of external wall. The effects of heat transfer on flame stability must be further investigate. 

Prof. Dr. Gojmir Radica
Dr. Željko Penga
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

  • heat transfer enhancement
  • materials
  • high thermal conductivity
  • combustion performance

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Published Papers (2 papers)

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Research

15 pages, 5496 KiB  
Article
Parameter Variation Study of Two-Stroke Low-Speed Diesel Engine Using Multi-Zone Combustion Model
by Zdeslav Jurić, Roko Kutija, Tino Vidović and Gojmir Radica
Energies 2022, 15(16), 5865; https://doi.org/10.3390/en15165865 - 12 Aug 2022
Cited by 3 | Viewed by 1610
Abstract
The latest electronically controlled marine engines have a control system that allows the operator to view all the essential parameters of the engine in real conditions during operation. The system is connected to the electronic control system (ECS) through the control network, thus [...] Read more.
The latest electronically controlled marine engines have a control system that allows the operator to view all the essential parameters of the engine in real conditions during operation. The system is connected to the electronic control system (ECS) through the control network, thus controlling the engine. The operator has various management and monitoring options. The objective of this paper was to become familiar with the specific factors that affect engine operation and optimize engine operation. A model of a large marine engine was developed and calibrated with measured data. Simulations were performed, and the combustion process was analyzed. The parameter study was performed by varying the fuel injection and the gas exchange timing. Fuel consumption decreases by 6 g/kWh, and NOx emissions decrease by 0.5 g/kWh. The research conducted in this work will be used by engineers to understand the potential of new technologies to optimize combustion in real-world conditions during operation and for the future development of an expert system to continuously monitor, diagnose, and optimize engine health during operation. Full article
(This article belongs to the Special Issue Combustion Performance, Thermal Conductivity and Efficiency)
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21 pages, 5801 KiB  
Article
Optimization of Pre-Chamber Geometry and Operating Parameters in a Turbulent Jet Ignition Engine
by Viktor Dilber, Momir Sjerić, Rudolf Tomić, Josip Krajnović, Sara Ugrinić and Darko Kozarac
Energies 2022, 15(13), 4758; https://doi.org/10.3390/en15134758 - 28 Jun 2022
Cited by 16 | Viewed by 4334
Abstract
A turbulent jet ignition engine enables operation with lean mixtures, decreasing nitrogen oxide (NOX) emissions up to 92%, while the engine efficiency can be increased compared to conventional spark-ignition engines. The geometry of the pre-chamber and engine operating parameters play the [...] Read more.
A turbulent jet ignition engine enables operation with lean mixtures, decreasing nitrogen oxide (NOX) emissions up to 92%, while the engine efficiency can be increased compared to conventional spark-ignition engines. The geometry of the pre-chamber and engine operating parameters play the most important role in the performance of turbulent jet ignition engines and, therefore, must be optimized. The initial experimental and 3D CFD results of a single-cylinder engine fueled by gasoline were used for the calibration of a 0D/1D simulation model. The 0D/1D simulation model was upgraded to capture the effects of multiple flame propagations, and the evolution of the turbulence level was described by the new K-k-ε turbulence model, which considers the strong turbulent jets occurring in the main chamber. The optimization of the pre-chamber volume, the orifice diameter, the injected fuel mass in the pre-chamber and the spark timing was made over 9 different operating points covering the variation in engine speed and load with the objective of minimizing the fuel consumption while avoiding knock. Two optimization methods using 0D/1D simulations were presented: an individual optimization method for each operating point and a simultaneous optimization method over 9 operating points. It was found that the optimal pre-chamber volume at each operating point was around 5% of the clearance volume, while the favorable orifice diameters depended on engine load, with optimal values around 2.5 mm and 1.2 mm at stoichiometric mixtures and lean mixtures, respectively. Simultaneous optimization of the pre-chamber geometry for all considered operating points resulted in a pre-chamber volume equal to 5.14% of the clearance volume and an orifice diameter of 1.1 mm. Full article
(This article belongs to the Special Issue Combustion Performance, Thermal Conductivity and Efficiency)
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