21110 航空エンジン用気流微粒化燃料噴射弁の噴霧特性に関する研究(燃料と燃焼の新しい展開(2),OS.9 燃料と燃焼の新しい展開,学術講演)

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The effects of swirling air flow on the spray of a filming air-blast fuel injector were investigated experimentally at atmospheric pressure. Counter rotational inner and outer vane swirlers were fitted co-axially to the injector so that the liquid annular film was disintegrated by the swirling air jets. The vane angle in the outer air passage was varied from 20 to 60 degrees while that in the inner air passage was fixed at 45 degrees. The droplet size distribution of the sprays was measured by the laser diffraction technique. With increasing vane angle, the Sauter mean diameter decreased to a minimum at around 50 degrees and a further increase resulted in a steep increase in cone angle followed by an increase in the SMD. The effects of vane angle on the flame shape and lean blow-out were investigated using a quartz flame tube. A flared outer shroud, 3 mm in radius, was used the fuel injector for combustion study. Significant effects of vane angle were observed. The fuel injector was a bluish conical flame was stabilized at a vane angle of 45 degrees and a yellowish disk-shaped flame was at vane angles greater than 50. The disk shaped flame was stabilized at greater air-fuel ratios because of the locally fuel rich zone near the nozzle.
社団法人日本機械学会の論文
2008-03-13