衝突噴流型ジェットエンジン燃料噴射弁の微粒化特性に及ぼす壁面形状の効果

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  • Wall Geometry Effects on Atomization Characteristics of an Impingement-Jet Type Jet Engine Fuel Injector
  • ショウトツ フンリュウガタ ジェットエンジン ネンリョウ フンシャベン ノ ビリュウカ トクセイ ニ オヨボス ヘキメン ケイジョウ ノ コウカ
  • Wall Geometry Effects on Atomization Characteristics of an Impingement-Jet Type Jet Engine Fuel Injector

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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 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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