The characteristics of diffusion flame around a cylinder are investigated. The cylinder was located parallel with the longitudinal direction of the slit type burner. Varing the size of the cylinder and nozzle exit velocity, we took direct photographs of the flame and measured the mean temperature and species concentrations at the downstream of the cylinder.
Increasing the cylinder diameter, the flame height is shortened and flame around the cylinder is stabilized. When the cylinder diameter is larger than the nozzle width, the maximum temperature decrease rapidly with increasing axial distance. An analysis of the species concentration profiles in terms of the mixture fraction successfully correlates the data for the major species, but is not adequate for any of the profiles of the intermediate hydrocarbons or for the $CO_2$ profiles near the cylinder which is larger than the nozzle width.
