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March 4, 2026International Journal of Turbomachinery Propulsion and PowerOpen Access

The Influence of Hub Purge Flow Rate on Forced Response in a Low-Pressure Turbine

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Authors

ATAlexander TraffordSSSina StapelfeldtGLGustavo Lopes

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Overview

Computational investigation reveals hub purge flow affects forcing amplitudes in turbines, suggesting optimizations are needed.

Key Points

  • The primary goal is to understand how hub purge flow rate influences the forced response in low-pressure turbines.
  • Conducted time-accurate unsteady aeroelastic simulations of the SPLEEN turbine cascade.
  • Evaluated purge mass flow rates of 0.5% and 0.9% of the main passage flow.
  • Validated findings against test results from the Von Karman Institute for Fluid Dynamics.
  • Measured unsteady pressure and modal force at the stator vane passing.
  • Hub purge flow significantly reduced the amplitude of the unsteady pressure signal on the blade surface.
  • Certain changes in phase of unsteady pressure increased modal force for specific modes.
  • Results indicate both beneficial and potentially adverse effects of purge flow on turbine dynamics.

Cite This Study

Trafford et al. (2026) studied this question.

synapsesocial.com/papers/69a7ccd5d48f933b5eed8b01https://doi.org/10.3390/ijtpp11010012
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Also Consider

Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context:

  1. 1Impact of High-Pressure-Turbine Purge Flow on the Evolution of Turbulence in a Turbine Vane Frame2024 · 1 citations
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  3. 3Unsteady Interaction Between Purge Flow and Secondary Flow in High-Lift Low-Pressure Turbine2024 · 7 citations
  4. 4Numerical investigations of a low-pressure turbine purge flow control concept for reducing aerodynamic losses2024
  5. 5Large-Eddy Simulations of a High-Speed Low-Pressure Turbine Cascade With Purge Flow2024 · 1 citations