Evaporation of Three-Dimensional Wavy Liquid Film Entrained by Turbulent Gas Flow

DOI DOI 機関リポジトリ (HANDLE) Web Site 被引用文献3件 参考文献36件 オープンアクセス
  • 井上, 拓哉
    九州大学大学院工学府航空宇宙工学専攻 : 大学院生
  • 井上, 智博
    九州大学大学院工学研究院航空宇宙工学部門 : 准教授
  • 藤井, 剛
    国立研究開発法人宇宙航空研究開発機構 研究開発部門 第二研究ユニット
  • 大門, 優
    国立研究開発法人宇宙航空研究開発機構 研究開発部門 第三研究ユニット : 主任研究開発員

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説明

A film cooling technique using a liquid film subjected to a hot gas flow in a turbulent condition is theoretically investigated. We successfully incorporate the two essential factors for the evaporating liquid film, droplet entrainment and three-dimensional film architecture, allowing for the physically-consistent straightforward formulation. The validity of the present model is convinced by reproducing combustion test results conducted for two types flightmodel bipropellant thrusters, in which the film length or dryout point shortens approximately inversely proportional to the combustion pressure. The underlying scenario to determine the film length is revealed. The gas flow initiates the originally smooth liquid film to be destabilized by Kelvin-Helmholtz instability in the axial direction and accelerates the wave crests leading to Rayleigh-Taylor instability in the transverse direction. Superposing the two types of waves produces three-dimensional cusps on the film as roots of entrained droplets. The convective heat transfer evaporating the liquid film is enhanced by the entrainment, reducing the net film flow rate, and by the cusp structure, enlarging the area of liquid/gas interface along the transverse direction in particular.

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  • AIAA Journal

    AIAA Journal 60 (6), 3805-3812, 2022-02-02

    American Institute of Aeronautics and Astronautics

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