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oai:ebyu-rdlopen.rawdatalibrary.net:ebyu/123242026-10-18T20:36:38Zopenairedrivercom_ebyu_10000col_ebyu_10001

Effects of hydrogen addition on combustion and flame propagation characteristics of laser ignited methane/air mixturesYilmaz, HarunSchröder, LukasHillenbrand, ThomasBrüggemann, DieterHydrogen additionLaser ignitionPressure curve analysisFlammabilityHigh speed camerasHydrogenIgnitionMethaneNeodymium lasersYttrium aluminum garnetCH 4Combustion propagationCurve analysisEffect of hydrogenFlame propagationPressure curvePressure curve analysePropagation characteristicsGas mixturesIn this study, effects of hydrogen addition on combustion and flame propagation characteristics of methane/air mixtures were investigated in a constant volume combustion chamber. Tested gas mixtures are 100% CH4, 05% H2 – 95% CH4, 10% H2 – 90% CH4 and 15% H2 – 85% CH4, and such mixtures were ignited using a passively Q-switched Nd:YAG laser ignitor which has a pulse energy of 12.3 mJ, pulse duration of 2.4 ns and wave length of 1064 nm. A Schlieren setup coupled with a high-speed camera enabled evaluating flame propagation behavior, while pressure curve analysis provided necessary data for characterization of combustion properties. Additionally, lean flammability limits of gas mixtures were also determined at the test conditions. The unique properties of hydrogen (such as low density, high reactivity, high diffusivity etc) widened lean flammability limit. Rate of pressure rise and measured pressure values increased with hydrogen addition, regardless of the air-fuel equivalence ratio (λ). Lastly, hydrogen addition uniformly affected flame propagation characteristics and flame luminosity. Combustion process became more stable with hydrogen addition. © 2023 Hydrogen Energy Publications LLCElsevier Ltd2023Articlehttps://rdlopen.rawdatalibrary.net/r/ebyu/12324https://doi.org/10.1016/j.ijhydene.2023.01.2240360-3199enInternational Journal of Hydrogen Energyinfo:eu-repo/semantics/openAccessinfo:eu-repo/semantics/articlehttps://ebyu-rdlopen.rawdatalibrary.net/tr/items/ebyu/12324