Calculation of the Emissivity of Luminous Flames

Radiative heat transfer from products of combustion in building corridor fires

“…As a result of the above discussion, it is reasonable to use This expression is consistent with eqs (13) and (14) above.…”

“…This is implied from the fact that the above calculations indicate that K is approximately equal to or less than the measured a extinction coefficient, K^. The apparent lack of a scattering medium also makes eq (13) a good estimate of K^. However, the implication from the theory that the scattering component may be small is subject to question, since the theory relies on the physical nature of the particulate matter and the absence of liquid aerosols in the smoke.…”

“…The assumption of smoke composed of soot particulates coupled with the small particle limit as expressed in eq (13) appears to give a reasonable prediction of K in the visible. This is implied from the fact that the above calculations indicate that K is approximately equal to or less than the measured a extinction coefficient, K^. The apparent lack of a scattering medium also makes eq (13) a good estimate of K^.…”

“…It will be useful to compare the measured value of the extinction coefficient: K = 0.074 cm~l at X = 0.52 m, witĥ -1 the value predicted by eq (13) indicates negligible scattering.…”

Flame Front Propagation in an Optical GDI Engine under Stoichiometric and Lean Burn Conditions

“…As observed in previous works [13,39,51,60], these flames were due to the diffusive combustion of stratified fuel in the injector region and on the piston surfaces. In terms of spectroscopic evidence (Figure 18b), these flames featured a continuous signal that increased with a wavelength similar to the blackbody curve described by Planck's radiation law [61]. The oxidation of fuel deposits induced the formation of carbonaceous structures that formed soot by aggregation.…”