TY - JOUR
TI - Combustion of hythane diluted with CO2
AU - Hraiech Ibtissem
AU - Sautet Jean-Charles
AU - Yon Sébastien
AU - Mhimid Abdallah
JN - Thermal Science
PY - 2015
VL - 19
IS - 1
SP - 1
EP - 10
PT - Article
AB - With increasing concern about energy shortage and environmental protection,  improving engine fuel economy and reducing exhaust emissions have become  major research topics in combustion and engine development. Hythane (a blend  of hydrogen H2 and natural gas NG) has generated a significant interest as an  alternative fuel for the future. This paper describes an experimental study  of the effects of CO2 addition on the stability of a turbulent jet diffusion  NG-H2 flame. The mole fraction of hydrogen (% H2) in NG-H2 mixture was varied  from 0% to 50%. The equivalence ratio of the hythane/CO2/air mixture was kept  at stoichiometry. The results show that the lift-off height increases with  the addition of CO2 at various % H2 content in hythane. However, we observe  that with 20% H2, we can obtain a stable flame diluted with 40% CO2, while  for 0% H2, the flame is blown out above 20% CO2. This means that the limits  of flame blowing out are pushed with the additions of H2. Moreover, the  results show that for %H2 content in NG-H2 fuel up to 10%, the addition of  CO2 could produce lifted flame if the % CO2 is low. At higher % CO2 dilution,  flame would remain attached until blow-out. This is mainly due to the fact  that the dilution leads to ejection velocities very high but reactivity of  the mixture does not change so the flame tends to stretch.