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chapter 5 turbulent diffusion flames - FedOA

chapter 5 turbulent diffusion flames - FedOA

incandescence signal, cm

incandescence signal, cm -1 sr -1 incandescence signal, cm -1 sr -1 4.5E-07 4.0E-07 3.5E-07 3.0E-07 2.5E-07 2.0E-07 1.5E-07 1.0E-07 5.0E-08 0.0E+00 3.0E-07 2.5E-07 2.0E-07 1.5E-07 1.0E-07 5.0E-08 0.0E+00 0 1 2 3 4 5 6 r, mm 84 LII z40 fv soot z40 3.5E-06 3.0E-06 2.5E-06 2.0E-06 1.5E-06 1.0E-06 5.0E-07 0.0E+00 Fig. 3.26 LII signals and NOC volume fraction at 40 mm as function of the radial position. LII z70 fv soot z70 0 1 2 3 4 5 6 r, mm 3.0E-06 2.5E-06 2.0E-06 1.5E-06 1.0E-06 5.0E-07 0.0E+00 Fig. 3.27 LII signals and NOC volume fraction at 40 mm as function of the radial position. Soot volume fraction, cm 3 /cm 3 Soot volume fractin, cm 3 /cm 3

Therefore, as obtained in premixed condition, ultraviolet fluorescence and visible incandescence correlate very well with the two particles classis, being as characteristic emission signals of the two particle classes. However some uncertainties on the relative proportionality coefficient respect to the different flame locations and particularly respect to those obtained in premixed flames, raises some doubts about the calibration procedure, i.e. more accurate extinction correction, or on the effective nature of the signals in relationship to the different combustion systems. To allow particles size evaluation scattering measurements have been performed in the flame, Fig. 3.28. Furthermore, after subtraction of the estimated by flame modelling gas contribution, and by using the Rayleigh formulation of the light scattering the mean particle size have been evaluated and reported in Fig. 3.29 Qw, cm -1 sr -1 1.00E-02 1.00E-03 1.00E-04 1.00E-05 1.00E-06 1.00E-07 0 1 2 3 4 5 6 r, mm Fig. 3.28 Qvv by 213 nm vs. radial position. 85 Qw @ 213nm z5 Qw @ 213nm z10 Qw @ 213nm z20 Qw @ 213nm z30 Qw @ 213nm z70 Qw @ 213nm z40

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