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

Takuya Inoue, Chihiro Inoue, Go Fujii, Yu Daimon

研究成果: ジャーナルへの寄稿学術誌査読

抄録

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 conveyed by reproducing combustion test results conducted for two types of flight-model 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.

本文言語英語
ページ(範囲)3805-3812
ページ数8
ジャーナルAIAA journal
60
6
DOI
出版ステータス出版済み - 2022

!!!All Science Journal Classification (ASJC) codes

  • 航空宇宙工学

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