TED-AJ03-643 EFFECTS OF FINE FUEL DROPLETS ON FLAME PROPAGATION AT CONSTANT PRESSURE
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概要
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Flame propagation in ethanol sprays at a constant pressure was studied experimentally. Monodispersed and monosized sprays were used for experiments and generated by the condensation method using a rapid expansion apparatus. The pressure was set at 0.2 MPa for all experiments and kept constant during flame propagation. Mean droplet diameter, total equivalence ratio, gas equivalence ratio and liquid equivalence ratio were used as characteristic values of fuel sprays. The gas equivalence ratio was calculated form the temperature of mixtures on the assumption that the gas phase was saturated with fuel vapor. The liquid equivalence ratio was defined as the difference between the total equivalence ration and the gas equivalence ratio. Experiments were performed for homogeneous sprays of 11 μm in the mean droplet diameter. The total equivalence ration was varied from 0.6 to 1.9. The liquid equivalence ratio was varied within the range of 0-0.52. The results show that there are two regions of the total equivalence ratio where the flame propagation is promoted by fine fuel droplets suspended in the fuel vapor-air mixtures. One region is on the fuel-rich side and the other is on the fuel-lean side. In the case that the liquid equivalence ratio is 0.2,the flame speed takes the maximum at 0.9 in the total equivalence ratio. In the region where the flame speed decreases, the increase in the liquid equivalence ratio increases the flame speed. The flame speed of the homogeneous sprays of 0.8 in the total equivalence ratio increases and then decreases with the increase in the liquid equivalence ratio. On the other hand, for the sprays of 1.4 in the total equivalence ratio, the flame speed decreases and the increases. In the case that the total equivalence ratio is 0.9,the flame speed shows the two local maximum values. These dependences of the flame speed on the liquid equivalence ratio suggest that, the increase in the liquid equivalence ratio increases the local gas equivalence ratio in the reaction zone, and then, in the region over about 0.2 in the liquid equivalence ratio, decreases the local gas equivalence ratio.[figure]
- 一般社団法人日本機械学会の論文
著者
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NOMURA Hiroshi
College of Industrial Technology, Nihon University
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Kono M
Dpt. Of Aeronautics And Astrorauics University Of Tokyo
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Kono Michikata
Department Of Aeronautics And Astronautics University Of Tokyo
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Ujiie Yasushige
College Of Industrial Technology Nihon University
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Nomura Hiroshi
Department Of Mechanical Engineering Gunma University
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Yoda Shinichi
Space Utilization Research Center National Space Development Agency Of Japan
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Kono Michikata
Dpt. Of Aeronautics And Astrorauics University Of Tokyo
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SATO JUNICHI
Research Institute IHI
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Yoda Shinichi
Space Utilization Research Program Nasda
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Nomura Hiroshi
College Of Industrial Technology Nihon University
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SATO Junichi
Research Institute for Food Science, Kyoto University
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