A numerical study of transonic buffet on a supercritical airfoil

Q. Xiao, Her-Mann Tsai, Feng Liu

Research output: Contribution to journalArticle

64 Citations (Scopus)

Abstract

The flow of the BauerGarabedianKorn (BGK) No. 1 supercritical airfoil is investigated by the solution of the unsteady Reynolds-averagedNavierStokes equations with a two-equation lagged kωturbulent model.Two steady cases (M=0.71, α=1.396 deg and M=0.71, α=9.0 deg) and one unsteady case (M=0.71, α=6.97 deg), all with a far-stream Reynolds number of 20106, are computed. The results are compared with available experimental data. The computed shock motion and the evolution of the concomitant flow separation are examined. Space-time correlations of the unsteady pressure field are used to calculate the time for pressure waves to travel downstream within the separated region from the shock wave to the airfoil trailing edge and then back from the trailing edge to the shock outside the separated region. The reduced frequency so calculated agrees well with the computed buffet frequency, supporting the signal propagation mechanism for buffet proposed by Lee (Lee, B. H. K., Oscillation Shock Motion Caused by Transonic Shock Boundary-Layer Interaction, AIAA Journal, Vol. 28, No. 5, 1990, pp. 942944).
LanguageEnglish
Pages620-628
Number of pages9
JournalAIAA Journal
Volume44
Issue number3
DOIs
Publication statusPublished - Mar 2006

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Airfoils
Reynolds equation
Flow separation
Shock waves
Boundary layers
Reynolds number

Keywords

  • Bauer–Garabedian–Korn
  • Reynolds-averaged Navier–Stokes equations
  • computed shock motion
  • concomitant flow separation
  • pressure waves
  • airfoil

Cite this

Xiao, Q. ; Tsai, Her-Mann ; Liu, Feng. / A numerical study of transonic buffet on a supercritical airfoil. In: AIAA Journal. 2006 ; Vol. 44, No. 3. pp. 620-628.
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A numerical study of transonic buffet on a supercritical airfoil. / Xiao, Q.; Tsai, Her-Mann; Liu, Feng.

In: AIAA Journal, Vol. 44, No. 3, 03.2006, p. 620-628.

Research output: Contribution to journalArticle

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