火炎中におけるすす粒子の存在形態と光学的性質

概要

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A method for applying the agglomerate scattering theory to polydisperse soot agglomerates was developed, and the morphology and size distribution of the agglomerates suspended in a premixed ethylene-air flame of 1.95 equivalence ratio were inferred from data of the dissymmetry ratio in the differential scattering intensity and transmission electron microscopy (TEM). As a result, it was found that the size distribution diagram obtained by the TEM method was skewed to the right due to the coalescence on the collodion membrane for particle sampling, and that, if the optical method was applied assuming the monodispersity of soot agglomerates, their size was overestimated to be 1.8 to 3.1 times the TEM geometric mean value by volume, which had already shifted upward due to coalescence. The larger geometric standard deviation is assumed ; the smaller geometric mean size (number of primary spherical particles) is inferred by the optical technique. The effect of the geometric standard deviation is less prominent with single straight chains assumed for soot morphology than with double straight chains, although no vital difference is observed. As the real part of the complex refractive index is increased or the imaginary part is decreased, a smaller geometric mean size is inferred, as well as the increased effect of the geometric standard deviation, although, again, no vital difference is observed.
一般社団法人日本機械学会の論文
1993-10-25