Soot formation in high-pressure laminar co-flow ethylene flames diluted by nitrogen is studied by use of line of sight attenuation and laser scattering. Soot volume fraction is determined by line of sight attenuation for pressures of 4, 6, and 8 atmospheres, and compared with previous results by two-color thermometry. The data show good agreement with previous results. Average particle diameter is also determined by scattering for the first time in flames at these pressures. Particle diameters are found to be insensitive to pressure along the flame centerline, but positively correlated to pressure in the flame annulus.
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