With the two-stage combustion method being utilized in practical combustors, inverse diffusion flame is formed as secondary combustion air is blown into fuel atmosphere. An experimental study is conducted in our research to investigate lifting behavior of the inverse diffusion flame formed in the secondary combustion region. As a representative of behavior of lifted flame, lift-off heights of lifted flame in varying by dilution conditions are measured and compared to investigate effects of dilution gas addition to secondary oxidizer. We choose N2, CO2 and H2O as the dilution gases.
