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論文
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田村, 貴洋 ; 荒木, 幹也 ; 山田, 秀志 ; 志賀, 聖一 ; 林, 茂 ; 小保方, 富夫
概要:
application/pdf<br />Journal Article<br />Droplet size and spray dispersion characteristics of an impingement jet type jet engine fuel injector are investigated experimentally. The fuel injector is consisted of a pintle,
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intermediate ring, and outer ring, forming co-axial air flow channels with co-swirlers. Compressed air at room temperature is supplied with a blower, and is injected into the atmosphere through the co-axial channels. Distilled water is supplied with a liquid pump, and is injected from hole nozzles mounted in the pintle. The number of nozzles is 8 and 16. The liquid jets impinge onto impingement walls mounted on the intermediate ring, forming a free liquid film. From the tip of the liquid film, fine droplets are formed. The droplet size is measured using an LDSA, and the spray cross section is visualized using time-average Mie scattering method. It is shown that the droplet size is almost the same as the atomization of a simple wall impingement jet, which is much smaller than that for a conventional air-blast fuel injector, and it is observed that a relatively uniform spray is formed using the fuel injector.
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論文
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荒木, 幹也 ; 堀越, 順 ; 山田, 秀志 ; 志賀, 聖一 ; 林, 茂 ; 中村, 壽雄 ; 小保方, 富夫
概要:
application/pdf<br />Journal Article<br />Effects of a wall impingement jet on atomization characteristics of a jet engine fuel injector were investigated experimentally. Liquid is injected from 0.2mm-diam nozzles and the liquid
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columns impinge onto a wall. The liquid forms thin films on the impingement wall and fine droplets can be produced. Several kinds of impingement wall geometries, such as slope, parallel and cylinder types, were examined and the droplet size and atomization mode were investigated. The droplet size was measured with an LDSA. For the slope type, two kinds of atomization mode, namely, ""air blast atomization"" and ""pressure atomization"" modes were observed. The pressure atomization mode is preferable, since it leads to the atomization improvement of a jet engine in low load operations. For parallel types, the atomization characteristics were similar to that for the slope type. For cylinder types, pressure atomization mode can be realized with a small liquid injection pressure. And the droplet size in the pressure atomization mode is smaller when compared with the parallel types.
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論文
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荒木, 幹也 ; 許, 成軍 ; 志賀, 聖一 ; 山田, 秀志 ; 林, 茂 ; 中村, 壽雄
概要:
application/pdf<br />Journal Article<br />Atomization characteristics of a liquid film were investigated, experimentally
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, A liquid jet emerging from a straight-type hole nozzle is impinged onto a solid wall, forming a liquid film. Effects of three independent parameters were investigated, namely, injection pressure P_0, impingement angle α and impingement wall diameter d. The liquid film velocity V_2 was measured with a PDPA. The SMD of the droplets was measured with an LDSA. It is shown that the SMD decreases linearly with the increase in the liquid film velocity V_2, and that the gradient of the line decreases with the increase in the impingement angle α. For the case that the impingement angle α is 30deg, the SMD of the droplets is proportional to V_2^<-0.63>. For the case that the impingement angle α is 90deg, the SMD of the droplets is proportional to V_2^<-0.51>. For the case that V_2<300m/s, the SMD of the droplets is smaller than that for a liquid jet. It is shown that by use of a liquid film, atomization is enhanced compared with a liquid jet.
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| 4.
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論文
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山田, 秀志 ; 松本, 裕 ; 林, 茂 ; 志賀, 聖一 ; 荒木, 幹也 ; 堀越, 順 ; 中村, 壽雄 ; 小保方, 富夫
概要:
application/pdf<br />Journal Article<br />The effect of pressure atomization with wall impingement on the atomization characteristics was examined in a real scale jet engine burner. The air velocity was set from 41 to 92m/s, and the
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liquid injection pressure was from 0.5 to 7.5MPa. Two laser faci
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