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<p>This work employs a high-resolution large eddy simulation (LES) to reveal the unsteady flow characteristics of transonic turbine cascades. The results show that a distinct dovetail-shaped shock wave structure forms at the trailing edge of the cascade. PS-TE-shock impingement on the adjacent suction surface triggers boundary layer separation and rapid transition to turbulence. Wake shedding originates from shear-driven vortices forming at the trailing-edge shock intersection and detaching periodically. Pressure waves generated during shedding prop agate downstream along the PS-TE-shock, impacting the suction surface boundary layer and influencing its flow. POD analysis further elucidates the pressure wave propagation path.</p>

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LES Study on the Mechanism of Wake Vortex Shedding in Transonic Turbine

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年12月3日

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  • Xingshuang Wu,
  • Rongfei Yang,
  • Guoliang Wang,
  • Hao Wang,
  • Ning Ge

摘要

This work employs a high-resolution large eddy simulation (LES) to reveal the unsteady flow characteristics of transonic turbine cascades. The results show that a distinct dovetail-shaped shock wave structure forms at the trailing edge of the cascade. PS-TE-shock impingement on the adjacent suction surface triggers boundary layer separation and rapid transition to turbulence. Wake shedding originates from shear-driven vortices forming at the trailing-edge shock intersection and detaching periodically. Pressure waves generated during shedding prop agate downstream along the PS-TE-shock, impacting the suction surface boundary layer and influencing its flow. POD analysis further elucidates the pressure wave propagation path.