定常高温空気流中における燃料噴霧の着火 : 第2報,物理的因子の影響

概要

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Spontaneous ignition was studied on fuel sprays injected into a steady hot air flow by a hole-nozzle with a single hole. Usually, the ignition delay is the so-called Arrhenius type and makes a straight line in an Arrhenius plot. In the present study, the effect of physical factors on ignition was investigated, and special attention was paid as to how the gradient of the straight line is decided. five kinds of experiments were carried out: Where pure fuels of iso-octane and n-heptane were used in the beginning, then the mixing condition was changed with a cylinder inserted into fuel jets or a wall facing a fuel nozzle, and the spray condition was changed with a change of fuel injection pressure or with a change of water content in n-propanol/water solution fuel or diesel-oil/water emulsion fuel. As a result, it was found that physical factors change ignition delay greatly, but have almost no effect on the gradient of the straight line in an Arrhenius plot. Then, the temperature dependency of the ignition delay is considered to be controlled almost completely by the chemical factor.
社団法人日本機械学会の論文
1986-09-25