日本航空宇宙学会論文集
Online ISSN : 2432-3691
Print ISSN : 1344-6460
ISSN-L : 1344-6460
論文
オリフィス自由噴流の混合・拡散特性の改善・制御
社河内 敏彦鬼頭 みずき佐藤 光太郎辻本 公一安藤 俊剛
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ジャーナル フリー

2009 年 57 巻 663 号 p. 160-165

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Mixing and spreading characteristics of an orifice free jet are investigated changing the orifice plate thickness t/do, where do is the nozzle exit diameter, ranged from 0.01 to 1.5. Schlieren images show high mixing and spreading performances at t/do = 0.5 and Reynolds number Re = 1.5×104 because at the t/do = 0.5 the jet fluctuates by the separated flow from the inner edge of orifice alternates attachment and detachment to the outer edge. Hot-wire anemometry measurements are also performed to investigate the mean and fluctuating velocity profiles. It is found that the jet potential core length is insensitive to Re at Re > 7.0 × 103, but significantly influenced by the orifice plate thickness. The potential core length for t/do = 0.5 is the shortest reflecting the fluctuation at the nozzle exit.

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© 2009 The Japan Society for Aeronautical and Space Sciences
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