Study on Combustion Characteristics of Turbulent Rotating Ammonia-Methane Premixed Flame
A visualized turbulent swirling combustion device was designed to investigate the com-bustion characteristics of NH3-CH4 mixture.The experiments focused on analyzing the impact of equivalence ratio,ammonia mixing ratio(XNH3),and inlet air flow rate on the combustion pro-cess.The results indicated that as the equivalence ratio increased,nitrogen oxide(NO)emissions at the combustion chamber outlet first increased and then decreased,reaching a peak at φ=0.9.Analysis of the combustion spectrum revealed that a positive correlation between NO emissions and OH radical intensity.Chain reactions generated by NH2α radicals and water vapor promote the reduction of NO.Moreover,as XNH3 increased,the flame transitioned from blue to orange-yellow,with NO emissions showing a similar trend of first increasing and then decreasing,peaking around XNH3=0.4.Furthermore,NO emission was found to increase with inlet air flow rate during lean com-bustion but decrease it during rich combustion.The underlying mechanism for this phenomenon is analyzed.
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