Experimental and numerical investigation of explosive behavior of syngas/air mixtures. (19th April 2018)

• Record Type: Journal Article
• Authors: Tran, Manh-Vu; Scribano, Gianfranco; Chong, Cheng Tung; Ho, Thinh X.; Huynh, Thanh Cong
• Is Part Of: International journal of hydrogen energy. Volume 43:Number 16(2018)
• Page Start: 8152
• Page End: 8160
• Publication Date: 2018-04-19
• Subjects: Constant volume combustion chamber -- Explosion -- Numerical simulation -- Rate of pressure rise -- Syngas; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2018.03.077
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: In this study, the explosive behavior of syngas/air mixtures was investigated numerically in a 3-D cylindrical geometric model, using ANSYS Fluent. A chamber with the same dimensions as the geometry in the simulation was used to investigate the explosion process experimentally. The outcome was in good agreement with experimental results for most equivalence ratios at atmospheric pressure, while discrepancies were observed for very rich mixtures ( ϕ > 2.0) and at elevated pressure conditions. Both the experimental and simulated results showed that for syngas/air mixture, the maximum explosion pressure increased from lean ( ϕ = 0.8) to an equivalence ratio of 1.2, then decreased significantly with richer mixtures, indicating that maximum explosion pressure occurred at the equivalence ratio of 1.2, while explosion time was shortest at an equivalence ratio of 1.6. Increasing H2 content in the fuel blends significantly raised laminar burning velocity and shortened the explosion time, thereby increasing the maximum rate of pressure rise and deflagration index. Normalized peak pressure, the maximum rate of pressure rise and the deflagration index were sensitive to the initial pressure of the mixture, showing that they increased significantly with increased initial pressure. Graphical abstract: Highlights: Explosive behavior of syngas/air was investigated numerically and experimentally. The maximum explosion pressure occurred at an equivalence ratio of 1.2. The explosion time was shortest at an equivalence ratio of 1.6. ( dP / dt )max and K G increased with increased H2 content in the fuel blends. ( dP / dt )max and K G increased significantly with increased initial pressure.