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Updated: Sep 13, 2025

Preparation of Free-Surface Hyperbolic Water Vortices
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Fish Scale-Inspired Flow Control for Corner Vortex Suppression in Compressor Cascades.

Jin-Long Shen1, Ho-Chun Yang1, Szu-I Yeh1

  • 1Department of Aeronautics and Astronautics, National Cheng Kung University, Tainan City 701, Taiwan.

Biomimetics (Basel, Switzerland)
|July 25, 2025
PubMed
Summary
This summary is machine-generated.

Inspired by fish scales, a novel surface design suppresses corner vortices in compressor blades. This bio-inspired approach reduces aerodynamic drag and improves efficiency by energizing end-wall flow.

Keywords:
compressor cascadecorner separationfish scale structurepassive flow controltotal pressure loss

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Area of Science:

  • Aerodynamics
  • Fluid Mechanics
  • Turbomachinery

Background:

  • Corner separation at blade-end wall junctions significantly degrades compressor cascade performance.
  • Secondary flows and associated vortices are primary contributors to aerodynamic losses.

Purpose of the Study:

  • To investigate a passive flow control strategy using a fish scale-inspired surface structure.
  • To reduce corner separation and improve aerodynamic efficiency in compressor cascades.

Main Methods:

  • A fish scale-like surface was applied to the suction side of a cascade blade.
  • Wind tunnel experiments and numerical simulations were performed to assess aerodynamic effects.

Main Results:

  • The bio-inspired surface induced climbing vortices, energizing low-momentum fluid near the end wall.
  • Passage and corner vortices were effectively suppressed, reducing spanwise flow penetration.
  • Total pressure loss decreased by up to 5.69%, with improved end-wall flow uniformity.

Conclusions:

  • Biologically inspired surface designs offer a promising passive flow control method for corner vortex suppression.
  • This approach enhances aerodynamic efficiency and flow uniformity in turbomachinery systems.