Time-accurate numerical simulations were conducted on the aft-loaded L1A low-pressure turbine airfoil at a Reynolds number of 22,000 (based on inlet velocity magnitude and axial chord length). This flow condition produces a nonreattaching laminar separation zone on the airfoil suction surface. The numerical code TURBO is used to simulate this flow field as an implicit large eddy simulation (ILES). Generally, good agreement was found when compared to experimental time-averaged and instantaneous flow measurements. The numerical separation zone is slightly larger than that in the experiments, though integrated wake loss values improved from Reynolds-averaged Navier–Stokes (RANS)-based simulations. Instantaneous snapshots of the numerical flow field showed the Kelvin Helmholtz instability forming in the separated shear layer and a large-scale vortex shedding pattern at the airfoil trailing edge. These features were observed in the experiments with similar sizes and vorticity levels. Power spectral density analyses revealed a global passage oscillation in the numerics that was not observed experimentally. This oscillation was most likely a primary resonant frequency of the numerical domain.
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July 2016
Research-Article
Implicit Large Eddy Simulation of a Stalled Low-Pressure Turbine Airfoil
C. L. Memory,
C. L. Memory
Department of Mechanical and
Aerospace Engineering,
The Ohio State University,
Columbus, OH 43210
e-mail: Curtis.Memory@pw.utc.com
Aerospace Engineering,
The Ohio State University,
Columbus, OH 43210
e-mail: Curtis.Memory@pw.utc.com
Search for other works by this author on:
J. P. Chen,
J. P. Chen
Department of Mechanical and
Aerospace Engineering,
The Ohio State University,
Columbus, OH 43210
Aerospace Engineering,
The Ohio State University,
Columbus, OH 43210
Search for other works by this author on:
J. P. Bons
J. P. Bons
Department of Mechanical and
Aerospace Engineering,
The Ohio State University,
Columbus, OH 43210
Aerospace Engineering,
The Ohio State University,
Columbus, OH 43210
Search for other works by this author on:
C. L. Memory
Department of Mechanical and
Aerospace Engineering,
The Ohio State University,
Columbus, OH 43210
e-mail: Curtis.Memory@pw.utc.com
Aerospace Engineering,
The Ohio State University,
Columbus, OH 43210
e-mail: Curtis.Memory@pw.utc.com
J. P. Chen
Department of Mechanical and
Aerospace Engineering,
The Ohio State University,
Columbus, OH 43210
Aerospace Engineering,
The Ohio State University,
Columbus, OH 43210
J. P. Bons
Department of Mechanical and
Aerospace Engineering,
The Ohio State University,
Columbus, OH 43210
Aerospace Engineering,
The Ohio State University,
Columbus, OH 43210
1Corresponding author.
Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received December 5, 2015; final manuscript received December 21, 2015; published online February 17, 2016. Editor: Kenneth C. Hall.
J. Turbomach. Jul 2016, 138(7): 071008 (10 pages)
Published Online: February 17, 2016
Article history
Received:
December 5, 2015
Revised:
December 21, 2015
Citation
Memory, C. L., Chen, J. P., and Bons, J. P. (February 17, 2016). "Implicit Large Eddy Simulation of a Stalled Low-Pressure Turbine Airfoil." ASME. J. Turbomach. July 2016; 138(7): 071008. https://doi.org/10.1115/1.4032365
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