The Propagation Characteristics of Turbulent Expanding Flames of Methane/Hydrogen Blending Gas

Haoran Zhao (), Chunmiao Yuan, Gang Li and Fuchao Tian
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Haoran Zhao: Fire & Explosion Protection Laboratory, Northeastern University, Shenyang 110819, China
Chunmiao Yuan: Fire & Explosion Protection Laboratory, Northeastern University, Shenyang 110819, China
Gang Li: Fire & Explosion Protection Laboratory, Northeastern University, Shenyang 110819, China
Fuchao Tian: State Key Laboratory of Coal Mine Disaster Prevention and Control, China Coal Technology and Engineering Group Shenyang Research Institute, Shenfu Demonstration Zone, Fushun 113122, China

Energies, 2024, vol. 17, issue 23, 1-14

Abstract: In the present study, the effect of hydrogen addition on turbulent flame propagation characteristics is investigated in a fan-stirred combustion chamber. The turbulent burning velocities of methane/hydrogen mixture are determined over a wide range of hydrogen fractions, and four classical unified scaling models (the Zimont model, Gulder model, Schmidt model, and Peters model) are evaluated by the experimental data. The acceleration onset, cellular structure, and acceleration exponent of turbulent expanding flames are determined, and an empirical model of turbulent flame acceleration is proposed. The results indicate that turbulent burning velocity increases nonlinearly with the hydrogen addition, which is similar to that of laminar burning velocity. Turbulent flame acceleration weakens with the hydrogen addition, which is different from that of laminar flame acceleration. Turbulent flame acceleration is dominated by turbulent stretch, and flame intrinsic instability is negligible. Turbulent stretch reduces with hydrogen addition, because the interaction duration between turbulent vortexes and flamelets is shortened. The relative data and conclusions can provide useful reference for the model optimization and risk assessment of hydrogen-enriched gas explosion.

Keywords: flame acceleration; turbulent burning velocity; unified scaling models; explosion; hydrogen-enriched gas (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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