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Experiments and Simulations of Combustion Process II

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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 April 2024) | Viewed by 4072

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Special Issue Editor

Dr. Venera Giurcan

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Guest Editor

“Ilie Murgulescu” Institute of Physical Chemistry, Romanian Academy, 202 Spl. Independentei, 060021 Bucharest, Romania
Interests: combustion, flames, and explosion of gaseous homogeneous systems; explosion initiation and propagation in enclosures at various initial conditions; flammability of hydrocarbon–oxidizer mixtures (including the presence of diluent or inhibitor gaseous additives)
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Special Issue Information

Dear Colleagues,

I am pleased to invite you to contribute to a Special Issue entitled “Experiments and Simulations of Combustion Processes II” in the open access journal Energies.

The study of combustion phenomena is of great scientific interest due to their presence in a wide range of industrial and domestic processes and implies the necessity to ensure that the processes related to them are performed in the most efficient way. Modern combustion systems are designed with a high combustion efficiency, high reliability, and minimum emission of air pollutants. The combustion of hydrocarbons is perhaps industrially the most important combustion system due to its use in many apparatuses, such as car engines, gas turbine engines, heaters, incinerators, or furnaces. Under certain conditions, the combustion of hydrocarbons can take place as an explosion, whose evolution is due to a fast energy release, accumulating in the system due to a slow dissipation rate. This situation justifies the strong interest among researchers in hydrocarbons’ explosivity, as illustrated by studies that deal with such research and which focus on providing answers to three categories of problems: prediction, prevention, and protection, in connection with events (accidents) caused by explosions of chemical compounds.

This Special Issue is being launched to address recent advances regarding the study of combustion processes of hydrocarbons by experimental and/or numerical modeling, an important and widespread field.

Dr. Venera Giurcan
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

combustion
explosion
laminar or turbulent flames
hydrocarbons
gaseous, liquid, and/or solid fuels
biofuels
closed or vented vessels
premixed/non-premixed combustion
reaction kinetics
experiments
simulations
other

Related Special Issue

Experiments and Simulations of Combustion Process in Energies (17 articles)

Published Papers (5 papers)

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Research

21 pages, 23944 KiB

Open AccessArticle

Direct Numerical Simulation Analysis of the Closure of Turbulent Scalar Flux during Flame–Wall Interaction of Premixed Flames within Turbulent Boundary Layers

by Umair Ahmed, Sanjeev Kumar Ghai and Nilanjan Chakraborty

Energies 2024, 17(8), 1930; https://doi.org/10.3390/en17081930 - 18 Apr 2024

Viewed by 392

Abstract

The statistical behaviour and modelling of turbulent fluxes of the reaction progress variable and non-dimensional temperature in the context of Reynolds-Averaged Navier–Stokes (RANS) simulations have been analysed for flame–wall interactions within turbulent boundary layers. Three-dimensional Direct Numerical Simulation (DNS) databases of two different flame–wall interaction configurations—(i) statistically stationary oblique wall quenching (OWQ) of a V-flame in a turbulent channel flow and (ii) unsteady head-on quenching (HOQ) of a statistically planar flame propagating across a turbulent boundary layer—have been considered for this analysis. Scalar fluxes of both the temperature and reaction progress variable exhibit counter-gradient behaviour at all times during unsteady HOQ of statistically planar turbulent premixed flames considered here. In the case of statistically stationary V-flame OWQ, the scalar fluxes of both reaction progress variable and temperature exhibit counter-gradient behaviour before quenching, but gradient behaviour has been observed close to the wall once the flame begins to quench. The weakening of the effects of thermal expansion close to the wall as a result of flame quenching gives rise to a gradient type of transport for the streamwise component in the oblique quenching of the V-flame. It has been found that the relative orientation of the flame normal vector with respect to the wall normal vector needs to be accounted for in the algebraic scalar flux closure, which can be applied to different flame/flow configurations. An existing algebraic scalar flux model has been modified in this analysis for flame–wall interaction within turbulent boundary layers, and it has been demonstrated to capture the turbulent fluxes of the reaction progress variable and non-dimensional temperature reasonably accurately for both configurations considered here based on a priori DNS analysis. Full article

(This article belongs to the Special Issue Experiments and Simulations of Combustion Process II)

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21 pages, 9504 KiB

Open AccessArticle

New Aspects of the Pulse Combustion Process

by Marian Gieras and Adrian Marek Trzeciak

Energies 2024, 17(6), 1427; https://doi.org/10.3390/en17061427 - 15 Mar 2024

Viewed by 424

Abstract

Pulse combustion is an attractive yet still little-known form of combustion that can be successfully used in many industrial applications. Experimental studies show that the course of the combustion process in the valveless pulse combustion chamber is conditioned by the process of creating a well-mixed fuel–air mixture inside the chamber. In the paper, numerical calculations were carried out for selected operating conditions of the pulse chamber and compared with experimental results. This allowed for a better understanding and interpretation of the course of the pulsating combustion process itself. The role and importance of the rate of changes in the volume of the combustible mixture zone in the process of improving the efficiency of the combustion process were determined, and the reasons for changes in the pulsation frequency of the combustion process were also explained. Full article

(This article belongs to the Special Issue Experiments and Simulations of Combustion Process II)

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22 pages, 13401 KiB

Open AccessArticle

Improved Delayed Detached Eddy Simulation of Combustion of Hydrogen Jets in a High-Speed Confined Hot Air Cross Flow II: New Results

by Sergei Bakhne, Vladimir Vlasenko, Alexei Troshin, Vladimir Sabelnikov and Andrey Savelyev

Energies 2023, 16(21), 7262; https://doi.org/10.3390/en16217262 - 26 Oct 2023

Cited by 1 | Viewed by 635

Abstract

The improved delayed detached Eddy simulation (IDDES) approach used in the part I of this investigation to study the self-ignition and combustion of hydrogen jets in a high-speed transverse flow of hot vitiated air in a duct is extended in the following directions: (i) the wall boundary conditions are modified to take into account the optical windows employed in the experiments; (ii) the detailed chemical kinetic model with 19 reactions is used; (iii) a nonlinear turbulence model is implemented in the code to capture the secondary flows in the duct corners; (iv) the wall roughness model is adapted; (v) the synthetic turbulence generator is imposed upstream of the fuel injection. As a result of improving the mathematical and physical problem statements, a good agreement between the simulation and the experimental database obtained at the LAERTE workbench (ONERA) is achieved. Full article

(This article belongs to the Special Issue Experiments and Simulations of Combustion Process II)

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13 pages, 4033 KiB

Open AccessArticle

Expansion Coefficients and Propagation Speeds of Premixed n-Butane–Air Flames

by Domnina Razus, Codina Movileanu, Maria Mitu and Venera Giurcan

Energies 2023, 16(15), 5728; https://doi.org/10.3390/en16155728 - 31 Jul 2023

Viewed by 744

Abstract

The propagation speeds of premixed n-butane–air mixtures (2.0–5.7 vol%) were investigated under various initial conditions (pressures of 0.4–1.2 bar; temperatures of 289–500 K). The study consists of both, experimental measurements using two different enclosures (a sphere and a cylinder) and kinetic modeling via a dedicated computing program. The propagation speeds of premixed n-butane–air mixtures were obtained via the adiabatic model of flame propagation, which allows us to obtain these important parameters using the normal burning velocities and expansion coefficients. The expansion coefficients were calculated using thermodynamic data as the ratio of burnt to unburnt gas densities, assuming that an equilibrium was established in the flame front. The propagation speeds obtained based on the experimental burning velocities were analyzed for comparison with the computed velocities. Finally, the dependence of the propagation speed on the initial pressure and temperature was discussed. Full article

(This article belongs to the Special Issue Experiments and Simulations of Combustion Process II)

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16 pages, 4846 KiB

Open AccessArticle

Evaporation and Autoignition Characteristics of JP-10 Droplets with Hyperbranched Polyester as Additive

by Derui Jin, Ji Mi, Yongsheng Guo, Yitong Dai and Wenjun Fang

Energies 2023, 16(8), 3333; https://doi.org/10.3390/en16083333 - 09 Apr 2023

Cited by 1 | Viewed by 1382

Abstract

It was found in our previous work that hyperbranched polyester (HPE) can generate radicals and accelerate the chemical reactions of hydrocarbon fuels used as initiators. In this work, the evaporation and autoignition characteristics of JP-10 droplets with or without HPE were investigated using the high-speed backlight imaging technique in detail. The results indicate that the puffing and micro-explosion phenomena of HPE-blended JP-10 droplets can accelerate fuel evaporation and autoignition. When a 0.1% mass concentration of HPE was used, the droplet lifetime was reduced by 16.5% in evaporation at 850 K and 18.0% in autoignition at 900 K. A mechanism of HPE that promotes puffing and micro-explosions was proposed by analyzing droplet images of combustion and SEM images of combustion residues. Overall, this study provides a method for improving the evaporation and autoignition performance of JP-10. Full article

(This article belongs to the Special Issue Experiments and Simulations of Combustion Process II)

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