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Heat Transfer Enhancement of a Gas Turbine Blade-Tip Wall

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Author

Editor

  • Bengt Sundén
  • Qiuwang Wang
  • Yitung Chen

Summary, in English

The blade-tip region encounters high thermal loads because of the hot gas leakage flows. A common way to cool blade tips is to design serpentine passages with 180 degrees turn with the blade-tip walls inside the turbine blades. Improved internal convective cooling is therefore required to increase blade-tip lifetime. This chapter summarizes the heat transfer enhancement of an internal blade-tip wall having pins, dimples and protrusions, and the influence of guide ribs and pins material. It is found that the pinned tip exhibits best performance to improve the blade-tip cooling. However, when considering the added mechanical stress, making dimples is a more suitable way especially at low Reynolds numbers. Properly designed guide ribs might reduce the pressure loss.

Department/s

Publishing year

2014

Language

English

Pages

67-88

Publication/Series

Emerging Topics in Heat Transfer: Enhancement and Heat Exchangers

Document type

Book chapter

Publisher

WIT Press

Topic

  • Energy Engineering

Keywords

  • Blade-tip wall
  • heat transfer enhancement
  • numerical simulation

Status

Published

ISBN/ISSN/Other

  • ISBN: 978-1-84564-819-0