Abstract
The near-field structure of the jet diffusion flame is important for the mixing process of fuel and air, and for flame stability. The interaction between coherent vortices involved in the near field and the flame has been studied using the laser sheet method. The acoustic forced jet diffusion flames are also studied in order to investigate the possibility of the control of flame stability. We have developed a new seeding method of scattering particles for the laser sheet method. This method utilizes the combustion of magnesium ribbon and can produce smoky magnesium oxide particles of a mean size of 0.6 μm. Seeded particles distribute densely and uniformly. This method is applicable not only to laser sheet visualization but also to laser Doppler velocimeter and concentration measurement. Experiments of fuel jet revealed that coherent vortices enhance the mixing of fuel and surrounding air under the process of linear and nonlinear growths. Acoustic forcing of fuel flow can control the mixing process through coherent vortices of the flame base and flame stability.
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