Experimental study of turbulent premixed flames of gas-to-liquids (GTL) fuel in a fan-stirred combustion bomb
This study experimentally investigates the turbulent flame speeds (St) of Gas-to-Liquids (GTL) fuel and a 50/50 blend with diesel across turbulence intensities (u') ranging from 0.5 to 3.0 m/s and equivalence ratios (Φ) from 0.7 to 1.3. Experiments were conducted using a cylindrical fan-stirred...
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Elsevier
2024-12-01
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| Series: | Results in Engineering |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S259012302401329X |
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| author | Abdellatif M. Sadeq Ahmad K. Sleiti Samer F. Ahmed |
| author_facet | Abdellatif M. Sadeq Ahmad K. Sleiti Samer F. Ahmed |
| author_sort | Abdellatif M. Sadeq |
| collection | DOAJ |
| description | This study experimentally investigates the turbulent flame speeds (St) of Gas-to-Liquids (GTL) fuel and a 50/50 blend with diesel across turbulence intensities (u') ranging from 0.5 to 3.0 m/s and equivalence ratios (Φ) from 0.7 to 1.3. Experiments were conducted using a cylindrical fan-stirred combustion bomb at an initial temperature (Ti) of 463 K and atmospheric pressure under near homogeneous and isotropic turbulence (HIT) conditions. A pressure transducer measured the St of the propagating GTL flame. High-speed imaging reveals that changes in flame brightness are associated with variations in flame temperature and soot incandescence. Compared to diesel, stoichiometric GTL and the 50/50 diesel-GTL blend showed peak combustion pressure reductions of 8.9 % and 4.9 %, respectively. Rich diesel fuel and lean GTL exhibited higher pressure rise rates, flame propagation, and St due to their Lewis numbers (Le) being less than one, enhancing flame-turbulence interaction. At u‵ of 0.5, 1.5, and 3.0 m/s, St for GTL increased by approximately 3.6 %, 5.3 %, and 2.8 %, respectively, when compared to diesel, with these increases observed at Φ < 1.1. Transition from wrinkled to corrugated flamelets with increasing u‵ supports models predicting flame stability and potential industrial combustion efficiency improvements. Comparisons with numerical St results using the Zimont Turbulent Flame Speed Closure (Zimont TFC) model showed good agreement at lower (u' = 0.5 m/s) and mid-range (u' = 2.0 m/s) turbulence intensities but discrepancies at higher intensities (u' = 3.0 m/s), highlighting the need to refine numerical models for more accurate predictions across all turbulence levels. |
| format | Article |
| id | doaj-art-5a50bd23c6d84dfbb6f71aa0b59ac700 |
| institution | DOAJ |
| issn | 2590-1230 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Results in Engineering |
| spelling | doaj-art-5a50bd23c6d84dfbb6f71aa0b59ac7002025-08-20T02:52:27ZengElsevierResults in Engineering2590-12302024-12-012410307410.1016/j.rineng.2024.103074Experimental study of turbulent premixed flames of gas-to-liquids (GTL) fuel in a fan-stirred combustion bombAbdellatif M. Sadeq0Ahmad K. Sleiti1Samer F. Ahmed2Mechanical and Industrial Engineering Department, College of Engineering, Qatar University, P O Box 2713, Doha, QatarMechanical and Industrial Engineering Department, College of Engineering, Qatar University, P O Box 2713, Doha, QatarCorresponding author.; Mechanical and Industrial Engineering Department, College of Engineering, Qatar University, P O Box 2713, Doha, QatarThis study experimentally investigates the turbulent flame speeds (St) of Gas-to-Liquids (GTL) fuel and a 50/50 blend with diesel across turbulence intensities (u') ranging from 0.5 to 3.0 m/s and equivalence ratios (Φ) from 0.7 to 1.3. Experiments were conducted using a cylindrical fan-stirred combustion bomb at an initial temperature (Ti) of 463 K and atmospheric pressure under near homogeneous and isotropic turbulence (HIT) conditions. A pressure transducer measured the St of the propagating GTL flame. High-speed imaging reveals that changes in flame brightness are associated with variations in flame temperature and soot incandescence. Compared to diesel, stoichiometric GTL and the 50/50 diesel-GTL blend showed peak combustion pressure reductions of 8.9 % and 4.9 %, respectively. Rich diesel fuel and lean GTL exhibited higher pressure rise rates, flame propagation, and St due to their Lewis numbers (Le) being less than one, enhancing flame-turbulence interaction. At u‵ of 0.5, 1.5, and 3.0 m/s, St for GTL increased by approximately 3.6 %, 5.3 %, and 2.8 %, respectively, when compared to diesel, with these increases observed at Φ < 1.1. Transition from wrinkled to corrugated flamelets with increasing u‵ supports models predicting flame stability and potential industrial combustion efficiency improvements. Comparisons with numerical St results using the Zimont Turbulent Flame Speed Closure (Zimont TFC) model showed good agreement at lower (u' = 0.5 m/s) and mid-range (u' = 2.0 m/s) turbulence intensities but discrepancies at higher intensities (u' = 3.0 m/s), highlighting the need to refine numerical models for more accurate predictions across all turbulence levels.http://www.sciencedirect.com/science/article/pii/S259012302401329XCombustion bombTurbulent premixed flamesGTL fuelTurbulent flame speedsFlame natural luminosity |
| spellingShingle | Abdellatif M. Sadeq Ahmad K. Sleiti Samer F. Ahmed Experimental study of turbulent premixed flames of gas-to-liquids (GTL) fuel in a fan-stirred combustion bomb Results in Engineering Combustion bomb Turbulent premixed flames GTL fuel Turbulent flame speeds Flame natural luminosity |
| title | Experimental study of turbulent premixed flames of gas-to-liquids (GTL) fuel in a fan-stirred combustion bomb |
| title_full | Experimental study of turbulent premixed flames of gas-to-liquids (GTL) fuel in a fan-stirred combustion bomb |
| title_fullStr | Experimental study of turbulent premixed flames of gas-to-liquids (GTL) fuel in a fan-stirred combustion bomb |
| title_full_unstemmed | Experimental study of turbulent premixed flames of gas-to-liquids (GTL) fuel in a fan-stirred combustion bomb |
| title_short | Experimental study of turbulent premixed flames of gas-to-liquids (GTL) fuel in a fan-stirred combustion bomb |
| title_sort | experimental study of turbulent premixed flames of gas to liquids gtl fuel in a fan stirred combustion bomb |
| topic | Combustion bomb Turbulent premixed flames GTL fuel Turbulent flame speeds Flame natural luminosity |
| url | http://www.sciencedirect.com/science/article/pii/S259012302401329X |
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