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Leakage performance predictions of a brush seal based on fluid-solid coupling method.

Chang Yue1, Sun Bitian1, Zhang Lanzhu1

  • 1East China University of Science and Technology, Shanghai, China.

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Summary

This study introduces a new method to analyze brush seal performance by including bristle deformation. This combined approach improves predictions of fluid flow and leakage variations in brush seals.

Keywords:
Brush sealbristle deformationfluid–solid couplingnumerical analysisporous medium

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Area of Science:

  • Mechanical Engineering
  • Fluid Dynamics
  • Tribology

Background:

  • Brush seals are critical for preventing leakage in various engineering applications.
  • Current porous medium models for brush seals do not account for bristle deformation, limiting accuracy.
  • Bristle deformation significantly influences the sealing performance and fluid dynamics.

Purpose of the Study:

  • To develop and validate a novel combined numerical method for analyzing brush seal performance.
  • To incorporate the effect of bristle deformation into brush seal analysis.
  • To achieve more accurate predictions of fluid flow and leakage in brush seals.

Main Methods:

  • A fluid-solid coupling model was employed to calculate bristle deformation using a simplified bristle model.
  • The calculated bristle deformation data was then integrated as boundary conditions into a porous media model.
  • This combined approach simulates the complex interaction between fluid flow and bristle mechanics.

Main Results:

  • The proposed combined method provides a more accurate representation of brush seal behavior compared to traditional models.
  • Significant variations in media flow and leakage laws were observed due to the inclusion of bristle deformation.
  • The model successfully captures the influence of bristle deformation on sealing efficiency.

Conclusions:

  • The combined numerical method offers a superior approach for evaluating brush seal performance.
  • Accounting for bristle deformation is essential for precise analysis of fluid flow and leakage.
  • This research advances the understanding and design of effective brush seal technologies.