Tip Leakage Flow and Heat Transfer on Turbine Stage Tip and Casing: Effect of Unsteady Stator-Rotor Interactions

M. Hamidur Rahman, Sung In Kim, Ibrahim Hassan

Research output: Contribution to journalArticle

2 Citations (Scopus)
314 Downloads (Pure)

Abstract

Unsteady simulations were performed to investigate time dependent behaviors of the leakage flow structures and heat transfer on the rotor blade tip and casing in a single stage gas turbine engine. This paper mainly illustrates the unsteady nature of the leakage flow and heat transfer, particularly, that caused by the stator–rotor interactions. In order to obtain time-accurate results, the effects of varying the number of time steps, sub iterations, and the number of vane passing periods was firstly examined. The effect of tip clearance height and rotor speeds was also examined. The results showed periodic patterns of the tip leakage flow and heat transfer rate distribution for each vane passing. The relative position of the vane and vane trailing edge shock with respect to time alters the flow conditions in the rotor domain, and results in significant variations in the tip leakage flow structures and heat transfer rate distributions. It is observed that the trailing edge shock phenomenon results in a critical heat transfer region on the blade tip and casing. Consequently, the turbine blade tip and casing are subjected to large fluctuations of Nusselt number (about Nu = 2000 to 6000 and about Nu = 1000 to 10000, respectively) at a high frequency (coinciding with the rotor speed).
Original languageEnglish
Article number1350058
Number of pages27
JournalInternational Journal of Computational Methods
Volume11
Issue number4
Early online date11 Oct 2013
DOIs
Publication statusPublished - Aug 2014

Keywords

  • tip leakage flow
  • gas turbine blade
  • stator-rotor
  • tip clearance
  • Nusselt number

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