原子発光法による気液混在場の瞬時濃度・蒸発率定量計測(熱工学,内燃機関,動力など)

概要

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Laser-induced breakdown spectroscopy (LIBS) with atomic emission excited with a focused high-energy ND : YAG laser was applied to quantify the concentration and the vapor fraction of liquid-gas mixtures. LIBS can exactly quantify local concentration even in liquid-gas mixtures as the ratio of the number of fuel-borne hydrogen atoms to nitrogen or oxygen atoms in the ambient gas has a strong linear relation with the ratio of their peak emission intensities regardless of phase of the fuel. The full width half maximum (FWHM) of the emission peak from the fuel-borne hydrogen linearly increases with an increase in liquid fraction due to doppler shift with micro-explosion, and the FWHM yields the fuel vapor fraction. Simultaneous, high-resolution measurements of equivalence ratio and vapor fraction in an intermittent fuel spray in a pressurized atmosphere were obtained with this method. The results showed that the tip of an intermittent spray has a richer mixture with lower vapor fraction.
社団法人日本機械学会の論文
2005-06-25