Influence of equivalence ratio and hydrogen addition on thermoacoustic instabilities in premixed methane and propane flames in vertical tubes
This research examines the behavior of premixed flames within a vertical tube, considering both an open and a closed end configuration. The study utilizes a pilot flame as the ignition source. The methane (CH4) and propane (C3H8) flames were tested at equivalence ratios (ϕ) ranging from 0.9 to 1.2 a...
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Elsevier
2025-05-01
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| Series: | Case Studies in Thermal Engineering |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214157X25002953 |
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| author | Abdullah M.A. Alsharif Robert Woolley |
| author_facet | Abdullah M.A. Alsharif Robert Woolley |
| author_sort | Abdullah M.A. Alsharif |
| collection | DOAJ |
| description | This research examines the behavior of premixed flames within a vertical tube, considering both an open and a closed end configuration. The study utilizes a pilot flame as the ignition source. The methane (CH4) and propane (C3H8) flames were tested at equivalence ratios (ϕ) ranging from 0.9 to 1.2 and constant hydrogen content at (RH = 0.1). High-speed cameras captured the flame propagation, revealing that several mechanisms, including pressure and velocity, influenced the flame shape and propagation rate. Increasing equivalence ratios initially raised laminar burning velocity, peaking at ϕ = 1.1, before decreasing. For C3H8, flames with lower burning velocity exhibited higher underlying flame speeds and maximum pressures alongside larger flame surface areas. It suggests that velocity coupling is the primary mechanism causing acoustic instability in flames that propagate downward. CH4 flames achieve maximum burning speed at a mixture ratio of ϕ = 1.1. Notably, the peak pressure and underlying speed remain constant. A comparative analysis of CH4 and C3H8 flames utilizing the RH method showed a distinctive correlation in behavior. Moreover, a comprehensive summary of CH4 and C3H8 flame behaviors is included, with (RH = 0–0.4) and (ϕ = 0.8–1.5). |
| format | Article |
| id | doaj-art-05967448b0524c049ef05264c07a7c3d |
| institution | DOAJ |
| issn | 2214-157X |
| language | English |
| publishDate | 2025-05-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Thermal Engineering |
| spelling | doaj-art-05967448b0524c049ef05264c07a7c3d2025-08-20T03:18:20ZengElsevierCase Studies in Thermal Engineering2214-157X2025-05-016910603510.1016/j.csite.2025.106035Influence of equivalence ratio and hydrogen addition on thermoacoustic instabilities in premixed methane and propane flames in vertical tubesAbdullah M.A. Alsharif0Robert Woolley1Department of Mechanical Engineering, College of Engineering at Yanbu, Taibah University, Yanbu Al-Bahr, 41911, Saudi Arabia; Corresponding author.Department of Mechanical Engineering, University of Sheffield, Sir Frederick Mappin Building, Mappin Street, Sheffield, S1 3JD, South Yorkshire, United KingdomThis research examines the behavior of premixed flames within a vertical tube, considering both an open and a closed end configuration. The study utilizes a pilot flame as the ignition source. The methane (CH4) and propane (C3H8) flames were tested at equivalence ratios (ϕ) ranging from 0.9 to 1.2 and constant hydrogen content at (RH = 0.1). High-speed cameras captured the flame propagation, revealing that several mechanisms, including pressure and velocity, influenced the flame shape and propagation rate. Increasing equivalence ratios initially raised laminar burning velocity, peaking at ϕ = 1.1, before decreasing. For C3H8, flames with lower burning velocity exhibited higher underlying flame speeds and maximum pressures alongside larger flame surface areas. It suggests that velocity coupling is the primary mechanism causing acoustic instability in flames that propagate downward. CH4 flames achieve maximum burning speed at a mixture ratio of ϕ = 1.1. Notably, the peak pressure and underlying speed remain constant. A comparative analysis of CH4 and C3H8 flames utilizing the RH method showed a distinctive correlation in behavior. Moreover, a comprehensive summary of CH4 and C3H8 flame behaviors is included, with (RH = 0–0.4) and (ϕ = 0.8–1.5).http://www.sciencedirect.com/science/article/pii/S2214157X25002953MethanePropaneHydrogen additionEquivalence ratioThermoacoustic |
| spellingShingle | Abdullah M.A. Alsharif Robert Woolley Influence of equivalence ratio and hydrogen addition on thermoacoustic instabilities in premixed methane and propane flames in vertical tubes Case Studies in Thermal Engineering Methane Propane Hydrogen addition Equivalence ratio Thermoacoustic |
| title | Influence of equivalence ratio and hydrogen addition on thermoacoustic instabilities in premixed methane and propane flames in vertical tubes |
| title_full | Influence of equivalence ratio and hydrogen addition on thermoacoustic instabilities in premixed methane and propane flames in vertical tubes |
| title_fullStr | Influence of equivalence ratio and hydrogen addition on thermoacoustic instabilities in premixed methane and propane flames in vertical tubes |
| title_full_unstemmed | Influence of equivalence ratio and hydrogen addition on thermoacoustic instabilities in premixed methane and propane flames in vertical tubes |
| title_short | Influence of equivalence ratio and hydrogen addition on thermoacoustic instabilities in premixed methane and propane flames in vertical tubes |
| title_sort | influence of equivalence ratio and hydrogen addition on thermoacoustic instabilities in premixed methane and propane flames in vertical tubes |
| topic | Methane Propane Hydrogen addition Equivalence ratio Thermoacoustic |
| url | http://www.sciencedirect.com/science/article/pii/S2214157X25002953 |
| work_keys_str_mv | AT abdullahmaalsharif influenceofequivalenceratioandhydrogenadditiononthermoacousticinstabilitiesinpremixedmethaneandpropaneflamesinverticaltubes AT robertwoolley influenceofequivalenceratioandhydrogenadditiononthermoacousticinstabilitiesinpremixedmethaneandpropaneflamesinverticaltubes |