Study on flame stability of hydrogen blended low calorific value gases
ZHANG Xin
ZHENG Shizhuo
HOU Xiaosen
ZHANG Jibao
Abstract：The development and evolution of the cellular flames of H2 blended low calorific value (LCV)gas under coupled hydrodynamic and diffusional-thermal instabilities were investigated based on the direct numerical simulation (DNS)approach and the detailed chemical mechanisms. The governing equations of gas fuel combustion including multiple species diffusion factors were established.The regimes of cellular flame of LCV gas under the influence of instabilities were ob-tained,including cell splitting,local extinction,secondary extinction and reburning.The results show that an early onset of cellular flames is observed,and the amplitudes of cellular flame front increase with the increase of H2 in fuel/air mixtures.The cellular instability is suppressed with the increase of CO2 in fuel/air mixtures.Cell splitting,local extinction and reburning of cellular flames occur in LCV gas fuel with high H2 fraction under the influence of instabilities.The sec-ondary extinction of cellular flames only occurs in lean H2/air flames under strong diffusional-thermal instability.
Keywords：LCVH2laminar combustionflame instabilityDNScellular flame
Publication Date：2016-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 108-115 )