OCR Text |
Show o |2 S. 3 O . (_) •VI o QC o z6 C.0^^0 <=> 0 oo. 00 o<> *o SLURRY FLOW - 420 Ibm/hr AIR FLOW - 160 Ibm/hr o <*>vv<*> O. O^ 0<t> OO - 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 60 20 40 60 80 100 120 140 160 180 S I Z E (MICRONS) Figure 6 Measured Particle Size Histogram for an A/F Ratio of 0.36 Additionally, Figures 5 and 6 both indicate the presence of particles in excess of 170 microns; although the atomization conditions are quite different, the distribution appears nearly the same. This situation arises because the size distributions measured are incomplete in that all sizes are not measured simultaneously. Even though droplet diameters that characterize the spray may be changing with atomizing conditions, these changes may occur outside the measurement range. Thus, the droplet distribution measured over a limited size range may change only slightly. Since only a portion of the entire size distribution is measured, statistical parameters (mean values) will not be indicative of the entire spray. Instead, the relative number and ratio of particles in two size regions were calculated for the various test conditions. This number ratio is shown in Figure 7 as a function of air-to-fuel (A/F) ratio. Data is shown for constant fuel flow and for constant air flow. -10- |