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Fluids
Special Issues
Fluid Flow and Its Impact on Combustion
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Fluid Flow and Its Impact on Combustion

A special issue of Fluids (ISSN 2311-5521).

Deadline for manuscript submissions: closed (31 May 2021) | Viewed by 9223

Special Issue Editor

Prof. Dr. Madjid Birouk

E-Mail Website
Guest Editor
Department of Mechanical Engineering, University of Manitoba, Winnipeg, MB R3T 5V6, Canada
Interests: turbulence; two-phase flow; droplets and spray; evaporation; combustion

Special Issue Information

Dear Colleagues,

Fluid flow plays an important role in many engineering applications, such as combustion, which is a process involving fuel oxidization to convert chemical energy into heat. The energy released from a fuel can then be converted into a thrust power to propel an aircraft, or into a mechanical power to drive a vehicle. The effectiveness of this process is evaluated based on two main outcomes—namely, fuel burning efficiency and composition of the combustion products that can cause serious health problems. Depending on the application/system, fuel burning can be executed in a diffusion, premixed mode or both. In any case, fluid flow conditions leading to combustion play a crucial role in achieving efficient and less pollutant combustion.

Therefore, being able to develop strategies that allow generating and controlling fluid flow conditions leading to green combustion is a major advance in today’s heat and power generation technology. The focus of this Special Issue of Fluids is on fundamental research targeted at understanding how to create fluid flow conditions that maximize fuel burning efficiency while still reducing pollution. Research papers with this purpose in mind, including reacting, non-reacting, swirling or non-swirling flows, both experimentally or numerically, are welcome contributions in this Special Issue of Fluids.

Prof. Dr. Madjid Birouk
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. Fluids is an international peer-reviewed open access monthly 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 1800 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
  • fluid flow
  • green combustion
  • fuel burning efficiency
  • reacting flows or non-reacting flows
  • swirling flows or non-swirling flows

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Published Papers (3 papers)

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Research

20 pages, 7279 KiB  
Article
Experimental and Numerical Study of Swirling Diffusion Flame Provided by a Coaxial Burner: Effect of Inlet Velocity Ratio
by Sawssen Chakchak, Ammar Hidouri, Hajar Zaidaoui, Mouldi Chrigui and Toufik Boushaki
Fluids 2021, 6(4), 159; https://doi.org/10.3390/fluids6040159 - 16 Apr 2021
Cited by 9 | Viewed by 4207
Abstract
This paper reports an experimental and numerical investigation of a methane-air diffusion flame stabilized over a swirler coaxial burner. The burner configuration consists of two tubes with a swirler placed in the annular part. The passage of the oxidant is ensured by the [...] Read more.
This paper reports an experimental and numerical investigation of a methane-air diffusion flame stabilized over a swirler coaxial burner. The burner configuration consists of two tubes with a swirler placed in the annular part. The passage of the oxidant is ensured by the annular tube; however, the fuel is injected by the central jet through eight holes across the oxidizer flow. The experiments were conducted in a combustion chamber of 25 kW power and 48 × 48 × 100 cm3 dimensions. Numerical flow fields were compared with stereoscopic particle image velocimetry (stereo-PIV) fields for non-reacting and reacting cases. The turbulence was captured using the Reynolds averaged Navier-Stokes (RANS) approach, associated with the eddy dissipation combustion model (EDM) to resolve the turbulence/chemistry interaction. The simulations were performed using the Fluent CFD (Computational Fluid Dynamic) code. Comparison of the computed results and the experimental data showed that the RANS results were capable of predicting the swirling flow. The effect of the inlet velocity ratio on dynamic flow behavior, temperature distribution, species mass fraction and the pollutant emission were numerically studied. The results showed that the radial injection of fuel induces a partial premixing between reactants, which affects the flame behavior, in particular the flame stabilization. The increase in the velocity ratio (Rv) improves the turbulence and subsequently ameliorates the mixing. CO emissions caused by the temperature variation are also decreased due to the improvement of the inlet velocity ratio. Full article
(This article belongs to the Special Issue Fluid Flow and Its Impact on Combustion)
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18 pages, 307 KiB  
Article
Conceptual Limitations of the Probability Density Function Method for Modeling Turbulent Premixed Combustion and Closed-Form Description of Chemical Reactions’ Effects
by Vladimir L. Zimont
Fluids 2021, 6(4), 142; https://doi.org/10.3390/fluids6040142 - 6 Apr 2021
Cited by 2 | Viewed by 1744
Abstract
In this paper, we critically analyzed possibilities of probability density function (PDF) methods for the closed-form description of combustion chemical effects in turbulent premixed flames. We came to the conclusion that the concept of a closed-form description of chemical effects in the classical [...] Read more.
In this paper, we critically analyzed possibilities of probability density function (PDF) methods for the closed-form description of combustion chemical effects in turbulent premixed flames. We came to the conclusion that the concept of a closed-form description of chemical effects in the classical modeling strategy in the PDF method based on the use of reaction-independent mixing models is not applicable to turbulent flames. The reason for this is the strong dependence of mixing on the combustion reactions due to the thin-reaction-zone nature of turbulent combustion confirmed in recent optical studies and direct numerical simulations. In this case, the chemical effect is caused by coupled reaction–diffusion processes that take place in thin zones of instantaneous combustion. We considered possible alternative modeling strategies in the PDF method that would allow the chemical effects to be described in a closed form and came to the conclusion that this is possible only in a hypothetical case where instantaneous combustion occurs in reaction zones identical to the reaction zone of the undisturbed laminar flame. For turbulent combustion in the laminar flamelet regime, we use an inverse modeling strategy where the model PDF directly contains the characteristics of the laminar flame. For turbulent combustion in the distributed preheat zone regime, we offer an original joint direct/inverse modeling strategy. For turbulent combustion in the thickened flamelet regime, we combine the joint direct/inverse and inverse modeling strategies correspondingly for simulation of the thickened flamelet structure and for the determination of the global characteristics of the turbulent flame. Full article
(This article belongs to the Special Issue Fluid Flow and Its Impact on Combustion)
16 pages, 23821 KiB  
Article
Influence of a Standing Wave Flow-Field on the Dynamics of a Spray Diffusion Flame
by J. Barry Greenberg and David Katoshevski
Fluids 2021, 6(1), 27; https://doi.org/10.3390/fluids6010027 - 6 Jan 2021
Viewed by 2108
Abstract
A theoretical investigation of the influence of a standing wave flow-field on the dynamics of a laminar two-dimensional spray diffusion flame is presented for the first time. The mathematical analysis permits mild slip between the droplets and their host surroundings. For the liquid [...] Read more.
A theoretical investigation of the influence of a standing wave flow-field on the dynamics of a laminar two-dimensional spray diffusion flame is presented for the first time. The mathematical analysis permits mild slip between the droplets and their host surroundings. For the liquid phase, the use of a small Stokes number as the perturbation parameater enables a solution of the governing equations to be developed. Influence of the standing wave flow-field on droplet grouping is described by a specially constructed modification of the vaporization Damkohler number. Instantaneous flame front shapes are found via a solution for the usual Schwab–Zeldovitch parameter. Numerical results obtained from the analytical solution uncover the strong bearing that droplet grouping, induced by the standing wave flow-field, can have on flame height, shape, and type (over- or under-ventilated) and on the existence of multiple flame fronts. Full article
(This article belongs to the Special Issue Fluid Flow and Its Impact on Combustion)
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