The effect of hydrogen addition on the flame behavior of a non-premixed oxy-methane jet in a lab-scale furnace

The effects of hydrogen (H2) addition to a fuel jet on a non-premixed oxy-methane flame were experimentally investigated in a lab-scale furnace with a slot-type burner. To observe the flame behavior of a non-premixed oxy-methane jet, the flame stabilization and flame luminescence were measured. The flow velocity was varied in the range of uF = 7 ∼ 50 m/s for methane (CH4) gas and uOx = 10 ∼ 120 m/s for oxygen (O2) gas. The objective of the current study is to investigate the characteristics of the flame stabilization, flame spectra, and flame structure of a non-premixed oxy-methane flame as increasing H2 mole fraction in the fuel jet. The mole fraction of H2 gas in the fuel jet (XH2) was changed from XH2 = 0-15% over five steps. The experimental measurement showed that the flame stabilization area broadened as the hydrogen mole fraction in a fuel jet increased. In addition, the flame length of the non-premixed oxy-methane flame decreased as the hydrogen mole fraction in the fuel jet increased.