Details
| Original language | English |
|---|---|
| Title of host publication | ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition |
| Publisher | American Society of Mechanical Engineers(ASME) |
| Number of pages | 13 |
| Volume | Volume 2B: Turbomachinery |
| ISBN (print) | 9780791851005 |
| Publication status | Published - 2018 |
| Event | ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition, GT 2018 - Oslo, Norway Duration: 11 Jun 2018 → 15 Jun 2018 |
Publication series
| Name | Turbo Expo: Power for Land, Sea, and Air |
|---|
Abstract
Turbulence contains a wide range of scales which form the turbulent spectrum. In low-pressure turbines (LPT) these scales of the turbulent free-stream influence large-scale mixing, the decay of turbulence kinetic energy and the transition of boundary layers through their reception of the small scales. Although these mechanisms are known in principle, the effect of turbulent scales on LPT aerodynamics has not been quantified and analyzed in detail yet. By means of Large Eddy Simulations (LES) applying the Incompressible Divergence-Free Synthetic Eddy Method (I-DFSEM) - introduced in Part A of this two-part paper - at the domain inlet to impose any desired turbulent boundary condition, the MTUT161 LPT cascade is investigated under low-speed conditions. The simulations are successfully validated by the experimental results of the turbulent spectrum. In order to separate the effect of turbulence intensity and length scale on the cascade aerodynamics, the turbulent length scale is systematically varied while ensuring similar turbulence intensity at the profile's leading edge. The results show an influence of the turbulent spectrum on separation-induced boundary layer transition. It is shown that the separated shear layer is amplified by integral length scales corresponding to frequencies close to the Kelvin-Helmholtz instability. Consequently it affects the turbulent mixing such that the transition point and lengths differ.
ASJC Scopus subject areas
- Engineering(all)
- General Engineering
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ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition . Vol. Volume 2B: Turbomachinery American Society of Mechanical Engineers(ASME), 2018. (Turbo Expo: Power for Land, Sea, and Air).
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - The Effect of Turbulent Scales on Low-Pressure Turbine Aerodynamics, Part B: Scale Resolving Simulations
AU - Schwarzbach, Felix
AU - Müller-Schindewolffs, Christoph
AU - Bode, Christoph
AU - Herbst, Florian
N1 - Publisher Copyright: © Copyright 2018 ASME.
PY - 2018
Y1 - 2018
N2 - Turbulence contains a wide range of scales which form the turbulent spectrum. In low-pressure turbines (LPT) these scales of the turbulent free-stream influence large-scale mixing, the decay of turbulence kinetic energy and the transition of boundary layers through their reception of the small scales. Although these mechanisms are known in principle, the effect of turbulent scales on LPT aerodynamics has not been quantified and analyzed in detail yet. By means of Large Eddy Simulations (LES) applying the Incompressible Divergence-Free Synthetic Eddy Method (I-DFSEM) - introduced in Part A of this two-part paper - at the domain inlet to impose any desired turbulent boundary condition, the MTUT161 LPT cascade is investigated under low-speed conditions. The simulations are successfully validated by the experimental results of the turbulent spectrum. In order to separate the effect of turbulence intensity and length scale on the cascade aerodynamics, the turbulent length scale is systematically varied while ensuring similar turbulence intensity at the profile's leading edge. The results show an influence of the turbulent spectrum on separation-induced boundary layer transition. It is shown that the separated shear layer is amplified by integral length scales corresponding to frequencies close to the Kelvin-Helmholtz instability. Consequently it affects the turbulent mixing such that the transition point and lengths differ.
AB - Turbulence contains a wide range of scales which form the turbulent spectrum. In low-pressure turbines (LPT) these scales of the turbulent free-stream influence large-scale mixing, the decay of turbulence kinetic energy and the transition of boundary layers through their reception of the small scales. Although these mechanisms are known in principle, the effect of turbulent scales on LPT aerodynamics has not been quantified and analyzed in detail yet. By means of Large Eddy Simulations (LES) applying the Incompressible Divergence-Free Synthetic Eddy Method (I-DFSEM) - introduced in Part A of this two-part paper - at the domain inlet to impose any desired turbulent boundary condition, the MTUT161 LPT cascade is investigated under low-speed conditions. The simulations are successfully validated by the experimental results of the turbulent spectrum. In order to separate the effect of turbulence intensity and length scale on the cascade aerodynamics, the turbulent length scale is systematically varied while ensuring similar turbulence intensity at the profile's leading edge. The results show an influence of the turbulent spectrum on separation-induced boundary layer transition. It is shown that the separated shear layer is amplified by integral length scales corresponding to frequencies close to the Kelvin-Helmholtz instability. Consequently it affects the turbulent mixing such that the transition point and lengths differ.
UR - http://www.scopus.com/inward/record.url?scp=85054086466&partnerID=8YFLogxK
U2 - 10.1115/GT2018-75163
DO - 10.1115/GT2018-75163
M3 - Conference contribution
AN - SCOPUS:85054086466
SN - 9780791851005
VL - Volume 2B: Turbomachinery
T3 - Turbo Expo: Power for Land, Sea, and Air
BT - ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition
PB - American Society of Mechanical Engineers(ASME)
T2 - ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition, GT 2018
Y2 - 11 June 2018 through 15 June 2018
ER -