Title page for etd-0724117-214852


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URN etd-0724117-214852
Author Chen-An Huang
Author's Email Address No Public.
Statistics This thesis had been viewed 5350 times. Download 626 times.
Department Mechanical and Electro-Mechanical Engineering
Year 2016
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Numerical Simulation and Analysis of Dynamic Stall on a Pitching Airfoil with Turbulence Models
Date of Defense 2017-07-25
Page Count 55
Keyword
  • LEV
  • LSB
  • Reynolds number
  • Dynamic stall
  • Turbulence models
  • Abstract The objective of this study is to discuss and analyze the flow structure around a pitching airfoil in the flow field through simulations. The SST k-ω and Transition SST turbulence models combined with dynamic mesh are used to simulate different experiments with different reduced frequencies. The comparisons between simulations and experimental data are presented by the normal force coefficient. Furthermore, the phenomena of dynamic stalls are analyzed by the streamline and the pressure distribution. Under the higher Reynolds numbers, because of the domination of the turbulent boundary layer, the results of SST k-ω model are in good agreement with the experimental data, and the growth of leading edge vortex (LEV) and the onset of the stall postpone in the results of Transition SST model. Under the lower Reynolds numbers, laminar separation bubble (LSB) forms at the leading edge of airfoil to induce transition phenomenon, which is the reason why the Transition SST model performs better than the SST k-ω model.
    Advisory Committee
  • San-Yih Lin - chair
  • Yang-Yao Niu - co-chair
  • Chien-Chou Tseng - advisor
  • Files
  • etd-0724117-214852.pdf
  • indicate access worldwide
    Date of Submission 2017-08-24

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