Abstract
Flame base structures of lifted diffusion flames have been investigated experimentally by using a simultaneous Rayleigh and Raman scattering method. The rations of signal to noise are estimated approximately 50 for the Rayleigh scattering method and 15 for the Raman scattering one, respectively. Experiments have been conducted in the configuration of a coaxial burner consisting of an inner tube of 3.2 ID and an outer tube of 56 ID. As a result, it is found that flames seem to limit the turbulent mixing and moreover at the flame base of lifted flames the nitrogen concentration increases near the center region of the jet, due to the turbulent mixing in the unburned region at the flame base, although decreasing at the flame region.
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