The laminar flame propagating process of natural gas-hydrogen-diluent gas-air was studied in a constant volume combustion bomb with the initial pressure of 0.1, MPa and the initial temperature of 285 K. Markstein lengths were obtained at various hydrogen fractions, diluent ratios and equivalence ratios. Effects of nitrogen and CO2 diluent gas on flame stability were analyzed separately and then compared based on the measured Markstein length and schlieren photos. The results show that Markstein length decreases with the increase of hydrogen fraction. Markstein length can either increase or decrease with the increase of diluent ratio, depending on hydrogen fraction and equivalence ratio. It is also found that CO2 has greater effect on flame stability than nitrogen.
|Number of pages
|Ranshao Kexue Yu Jishu/Journal of Combustion Science and Technology
|Published - 1 Jun 2010