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This paper deals with the process regarding how dehydrogenation of soot particles takes place. The measured carbon/hydrogen ratios plotted against mean-diameter of soots fall on a straight line passing through the origin. It is shown that in the course of soot particle growth CM ratio increases linearly with the particle diameter: D. This is an indication of the fact that the number of carbon grows in proportion to D3, whereas that of hydrogen is proportional to D2. It is there by concluded that hydrogen sit only on surface of soot particles.

Temperature distributions in n-heptane and n-tridecane sprays were measured by the planar laser induced fluorescence (PLIF) method. The spray was formed by injecting fuel into high temperature and high pressure ambient, which was formed by compression of rapid compression and expansion machine (RCEM). In this PLIF method, acetone was used as a fluorescence tracer and was mixed with ambient gas. The fluorescence tracer was excited by 266 nm (the 4th harmonic of a Nd:YAG laser). The fluorescence intensity was measured by an ICCD camera. The temperature and concentration were estimated based on temperature dependency of the fluorescence intensity and the assumption of adiabatic mixing. Based on the measurement results, The difference of mixture distributions in n-heptane and n-tridecane sprays are discussed.