| Popis: |
In this work, we studied the effect of swirl flows in the turbulent and non-turbulent flame on soot formation in a methane/air fuel-rich combustion at atmospheric pressure. Combustion air and methane were supplied to an experimental combustor through a coaxial nozzle to form diffusion flame. The equivalence ratio was kept at 1.9. In general, the flames are luminous during a fuel-rich combustion. Based on Plank’s law and other researches, the intensity level of emission from soot particles and soot concentration are increased with increase of temperature. However, the flame resulting in our experiment was not as described above. This result is discussed in conjunction with the experimentally observed distributions of temperature, continuum emission of radiation from soot particles, chemical species, and soot volume fraction. The results indicated that the temperature in the turbulent flame was higher than in the non-turbulent. In spite of the high flame temperature, soot continuum emissions and soot volume fraction in the turbulent flame were decreased. In addition, it was notice that H2 and CO concentrations in the turbulent flame were twice as high as that in the non-turbulent flow. Therefore soot formation was related to H2 and CO. |
