
232 Oxygen-Enhanced Combustion
results are listed in Table 10.7. The radiation inten-
sity from the pure oxygen/natural gas ame (Ω = 1.00)
was about four times that from the air/natural gas
ame (Ω = 0.21), for the same fuel consumption. This
is because nitrogen in the air absorbs energy from the
combustion reaction, but N
2
does not radiate. Figure
10.36 is the UV portion of the spectra plotted on a loga-
rithmic scale. Despite the relatively small contribution
of UV radiation to the total intensity, the presence of
UV emissions (predominantly from the electronically
excited OH radicals) can be explored as a way to visu-
alize nonluminous a ...