An experimental study was carried out to measure the evaporating processes of fuel sprays having different boiling points. n-dodecane was used a s the higher boiling point fuel, and iso-octane as the lower boiling point fuel. A laser induced fluorescence method was used to separate vapor and liquid-phases of the spray. The measurement of fluorescence wavelength indicates that dimethyl-anilene (5 wt/100)＋ naphthalene (5 wt/100) should be added to each fuel. As a result, it was confirmed that n-dodecane in a spray consisting of n-dodecane and iso-ocatane evaporates more rapidly than an n-dodecane spray.
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