Unsteady Simulations of a Film Cooling Flow from an Inclined Cylindrical Jet

Sung In Kim, Ibrahim Hassan

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Film cooling is extensively used to provide protection against the severe thermal environment in gas turbine engines. Most of the computational studies on film cooling flow have been done using steady Reynolds-averaged Navier–Stokes calculation procedures. However, the flowfield associated with a jet in a crossflow is highly unsteady and complex with different types of vortical structures. In this paper, a computational investigation about the unsteady phenomena of a jet in a crossflow is performed using detached eddy simulation. Detailed computation of a single row of 35 deg round holes on a flat plate has been obtained for a 1.0 blowing ratio and a 2.0 density ratio. First, time-step size, grid resolution, and computational domain tests for an unsteady simulation have been conducted. Comparison between the results of unsteady Reynolds-averaged Navier–Stokes calculation, detached eddy simulation, and large eddy simulation is also performed. Comparison of the time-averaged detached eddy simulation prediction with the measured film-cooling effectiveness shows that the detached eddy simulation prediction is reasonable. From present detached eddy simulations, the influential coherent vortical structures of a film cooling flow can be seen. The unsteady physics of jet in a crossflow interactions and a jet liftoff in film cooling flows have been explained.
Original languageEnglish
Pages (from-to)145-156
JournalJournal of Thermophysics and Heat Transfer
Volume24
Issue number1
DOIs
Publication statusPublished - 01 Jan 2010

Keywords

  • film cooling
  • CFD
  • unsteady simulation
  • gas turbine
  • DES

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