TED-AJ03-642 FLAME PROPAGATION IN UNIFORM FUEL SPRAYS AT HIGH PRESSURES

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概要

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• Combustion experiments have been performed to study the effects of pressure on flame propagation in uniform fuel sprays. Experimental data of uniform fuel spray combustion at high pressures are useful to understand the complicated combustion of fuel sprays in internal combustion engines. Uniform sprays were generated in a constant pressure combustion chamber by the condensation method using rapid expansion of saturated ethanol vapor-air mixtures. Flame speed was measured for various pressures P from 0.2 to 1.0MPa, total equivalence ratios Ф_t, liquid equivalence ratios Ф_l and mean droplet diameters d_m. The liquid equivalence ratio Ф_l was defined as the equivalence ratio calculated from the amount of the liquid fuel suspended in fuel vapor-air mixtures. The flame speed decreases as the increase in the pressure for all total equivalence ratios. The normalized flame speed (flame speed of uniform sprays divided by that of premixed gases) increases with the increase in the pressure for Ф_t=0.6 and 0.8,and decreases for Ф_t=1.0 and 1.2. For the uniform sprays ofФ_t=0.8 and d_m=8.5μm, the flame speeds at P=0.2,0.4 and 0.8MPa increase with the increase in the liquid equivalence ratio and then decrease. The maximum flame speed and the liquid equivalence ratio at which the flame speed takes the maximum value increase with the increase in the pressure. These three curves of the flame speed cross one another at about Ф_l=0.15. For Ф_t=1.4 and d_m=11μm, the flame speeds at P=0.2 and 0.8MPa decrease with the increase in the liquid equivalence ratio and then increase. The liquid equivalence ratio at which the flame speed takes the maximum value increases with the increase in the pressure. For uniform sprays of Ф_t=0.8,the difference of the flame speed between the mean droplet diameters of 8.5 and 11μm appears over Ф_l=0.2 at 0.2MPa, and below Ф_l=0.15 at 0.8MPa, respectively. The increase in the pressure promotes the evaporation of fuel droplets in the preheat zone of the flame. The results suggest that the slip (relative velocity between droplets and unburned gas) velocity and the evaporation rate determine the dependence of the flame speed of uniform sprays on the pressure.[figure]

• 一般社団法人日本機械学会の論文

著者

• NOMURA Hiroshi

  College of Industrial Technology, Nihon University

• Ujiie Yasushige

  College Of Industrial Technology Nihon University

• Nomura Hiroshi

  Department Of Mechanical Engineering Gunma University

• Hata Yukihiko

  College Of Industrial Technology Nihon University

• KAWASUMI IKUE

  College of Industrial Technology Nihon University

• SATO JUNICHI

  Research Institute IHI

• Nomura Hiroshi

  College Of Industrial Technology Nihon University

• SATO Junichi

  Research Institute for Food Science, Kyoto University

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