Lifted flame behavior of a non-premixed oxy-methane jet in a lab-scale slot burner

The characteristics of oxy-methane flames in atmospheric conditions (298 K and 1 bar) were studied in a lab-scale slot burner. As a diagnostic tool, OH∗, CH∗, and C 2 ∗ measurements were used to analyze the flame structure. To estimate the flame stabilization, the flow velocity was varied from uF = 7–50 m/s for methane gas and uOx = 10–170 m/s for oxygen gas. From the experimental results, the flame stability was enhanced when the slot width became narrower. The flame length increased with increasing fuel quantity, while the lift-off height increased with increase in the fuel jet and oxygen velocity. Using the concept of effective diameter, an empirical formula for flame length was suggested for use in a combustor design.