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Volume 49 Issue 9
Oct.  2023
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Journal of Beijing University of Aeronautics and Astronautics  > 2023  >  49(9): 2374-2384.
XUAN L M，ZOU Z P，ZENG F. Analyzing and modeling flow in tip clearance of transonic turbine rotor[J]. Journal of Beijing University of Aeronautics and Astronautics，2023，49（9）：2374-2384 （in Chinese） doi: 10.13700/j.bh.1001-5965.2021.0635
Citation: XUAN L M，ZOU Z P，ZENG F. Analyzing and modeling flow in tip clearance of transonic turbine rotor[J]. Journal of Beijing University of Aeronautics and Astronautics，2023，49（9）：2374-2384 （in Chinese） doi: 10.13700/j.bh.1001-5965.2021.0635
shu

Analyzing and modeling flow in tip clearance of transonic turbine rotor

doi: 10.13700/j.bh.1001-5965.2021.0635
  • 1.

    School of Energy & Power Engineering, Beihang University，Beijing 100191，China

  • 2.

    National Key Laboratory of Science and Technology on Aero-Engine Aero-Thermodynamics，Beijing 102206，China

  • 3.

    Research Institute of Aero-Engine，Beihang University，Beijing 102206，China

  • 4.

    Hunan Aviation Powerplant Research Institute，Zhuzhou 412002，China

Funds:  National Natural Science Foundation of China (51676005)
More Information
  • Corresponding author: E-mail：zouzhengping@buaa.edu.cn
  • Received Date: 26 Oct 2021
  • Accepted Date: 11 Jan 2022
  • Publish Date: 29 Jan 2022
    Abstract

  • In order to clarify the mechanism of the tip leakage flow in transonic turbines and further improve turbine efficiency, the effect of tip injection on the performance of a flat tip and a squealer tip is studied under the transonic condition, and the flow state in the clearance between a flat tip and squealer tip is discussed. The results show that under transonic conditions, tip jet can increase the aerodynamic efficiency of the flat tip cascade, and that the scraping vortex is still the dominant flow structure in the cavity of the squealer tip. The increase of jet flow has limited effect on the total leakage flow of the flat tip, but will increase the total leakage flow of the squealer tip. With higher load, the transonic flow in the flat tip clearance is related to the blade load and thickness. For squealer tips, the leakage flow expands rapidly to the supersonic state above the suction side squealer. Finally, a leakage flow prediction model for transonic conditions is established.

     

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