対向流拡散火炎を用いた輝炎の局所放射特性に関する分光学的検討-1 : 局所放射率の波長依存性を利用した煤状態診断手法の提案

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Spectroscopic study on local radiative properties of luminous flame, i.e. emission from soot could, is performed by utilizing counter flow burner. By means of propane-air counterflow diffusion flames, measurements of one-dimensional (perpendicular to the flame surface) distributions of temperature and radiative quantities in the stationary flame are accomplished. Examined spectral range is in the visible and near-infrared regime (0.6μm-1.0μm). It turns out that bulk emissivity from the luminous flame, ε_<LF>, shows apparent wavelength dependency in the observed spectral range (ε_<LF>=ε_<LF>(λ^<-α>)), and its power-law constant, α, varies along the perpendicular to the flame surface. By taking the longer observed wavelength in the visible regime (eg., 0.9μm), α closes to the constant irrespective of the observed location. By taking the shorter observed wavelength (eg., 0.7μm), on the other hand, α tends to be monotonically decreased to the high temperature regime (α has inverse correlation to the flame temperature). This trend is somewhat similar to the particle diameter or volume fraction of the soot cloud according to the previous literatures. It is suggested that non-gray body feature of the luminous flame (i.e. wavelength dependency on bulk emissivity) is pronounced when the large soot fragments are coarsely distributed. Adopting the shorter wavelength may work for better diagnostics on local soot status.
社団法人日本エネルギー学会の論文
2007-03-20

対向流拡散火炎を用いた輝炎の局所放射特性に関する分光学的検討-1 : 局所放射率の波長依存性を利用した煤状態診断手法の提案

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