Rotational effects on film cooling performance Simulation of a louver cooling scheme on a rotating turbine blade

C. X.Z. Zhang, I. Hassan

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Purpose - Numerical simulations were carried out for two cooling schemes, a circular hole and a louver cooling scheme, at the leading edge of a rotor blade in a complete turbine stage. Design/methodology/approach - Two holes were positioned at the leading edge of a rotating blade, one on the pressure side and the other on the suction side. The methodology was validated with a circular hole case. Numerical results of cooling effectiveness for three blowing ratios at three rotational speeds were successfully obtained. Both blowing ratio and rotating speed of the rotor affect the cooling effectiveness level. Findings - It was shown that for the circular hole, the blowing ratio is the dominant factor at low blowing ratios and the rotational speed is the dominant factor at high blow ratios when jet is prone to lift off in determining the cooling effectiveness level. For the louver scheme, a higher rotational speed leads to a higher level of cooling effectiveness since jet liftoff is avoided. Originality/value - There are only a few studies of film cooling on a rotational turbine blade and very few studies of film cooling at the leading edge of a rotating turbine blade in the open literature. The present work presents a challenging CFD case. The analysis of film cooling at the leading edge of an airfoil was presented, which sheds light on the physics of film cooling and should prove helpful to the cooling designs of turbine blades.

Original languageEnglish
Pages (from-to)622-640
Number of pages19
JournalInternational Journal of Numerical Methods for Heat and Fluid Flow
Volume22
Issue number5
DOIs
Publication statusPublished - 16 Aug 2012

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Keywords

  • CFD
  • Cooling systems
  • Film cooling
  • Gas turbine
  • Leading edge
  • Louver scheme
  • Rotating blade
  • Turbines

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Computer Science Applications
  • Applied Mathematics

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