Excimer蛍光法を用いた燃料噴霧中の液滴と蒸気の同時可視化 (特集燃焼のエアロゾル科学と熱物質移動計測との接点)

概要

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The laser induced Exciplex fluorescence (EXCIPLEX) technique proposed by Melton is based on the TMPD/Naphthalene system. The Exciplex fluorescence from liquid phase and Monomer TMPD fluorescence from vapor phase can separately visualize the both phases simultaneously. The objective of the present study is to develop an applicable method to the fuel vapor visualization in fuel spray. Firstly, the spatial distributions of liquid and vapor in a fuel spray suspended by ultrasonic waves were visualized by the EXCIPLEX technique. In this measurement, however, we found that the EXCIPLEX technique has various disadvantages. In addition, the fluorescence intensity from vapor phase was very weak. Instead of the method, therefore, we proposed a new laser induced Excimer fluorescence (EXCIMER) technique to visualize the liquid and vapor phases simultaneously. We choose the fluorescent molecule and examined the characteristics of Monomer and Excimer fluorescence spectra. We compared the EXCIMER technique with the EXCIPLEX technique and evaluated the EXCIMER technique. Finally, we investigated the correlation between fuel vapor concentration and fluorescence intensity by measuring the fluorescence intensity of saturated vapor formed over liquid fuel with a controlled temperature, and attempted the quantitative measurements of the fuel vapor concentration. (189 Words)