High-Fidelity Simulations of a Linear HPT Vane Cascade Subject to Varying Inlet Turbulence

Conference · Mon Jun 26 00:00:00 EDT 2017 · ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition; June 26–30, 2017; Charlotte, North Carolina, USA

DOI:https://doi.org/10.1115/GT2017-63079· OSTI ID:1567613

Pichler, Richard ^[1]; Sandberg, Richard D. ^[1]; Laskowski, Gregory ^[2]; Michelassi, Vittorio ^[3]

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1. University of Melbourne, Melbourne, Australia
2. General Electric Aviation, Lynn, MA
3. General Electric Oil and Gas, Florence, Italy

The effect of inflow turbulence intensity and turbulence length scales have been studied for a linear high-pressure turbine vane cascade at Reis = 590,000 and Mis = 0.93, using highly resolved compressible large-eddy simulations employing the WALE turbulence model. The turbulence intensity was varied between 6% and 20% while values of the turbulence length scales were prescribed between 5% and 20% of axial chord. The analysis focused on characterizing the inlet turbulence and quantifying the effect of the inlet turbulence variations on the vane boundary layers, in particular on the heat flux to the blade. The transition location on the suction side of the vane was found to be highly sensitive to both turbulence intensity and length scale, with the case with turbulence intensity 20% and 20% length scale showing by far the earliest onset of transition and much higher levels of heat flux over the entire vane. It was also found that the transition process was highly intermittent and local, with spanwise parts of the suction side surface of the vane remaining laminar all the way to the trailing edge even for high turbulence intensity cases.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)
• Sponsoring Organization: USDOE Office of Science; USDOE
• OSTI ID: 1567613
• Journal Information: ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition; June 26–30, 2017; Charlotte, North Carolina, USA, Journal Name: ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition; June 26–30, 2017; Charlotte, North Carolina, USA
• Country of Publication: United States
• Language: English