Experimental and Numerical Flow Analysis of an Engine-Realistic State-of-the-Art Turbine Rear Structure
Journal article, 2022
This paper presents experimental and numerical CFD studies of the aerodynamics of a turbine rear structure (TRS). The TRS test geometry is an engine-realistic state-of-the-art design with a polygonal outer case, recessed engine mount bumps, and three different vane types: regular vanes, bump vanes in bump sectors, and thick vanes. Using three different sector types simultaneously was found to be crucial for the inlet boundary conditions. Experiments were performed in a modern rotating test facility with an LPT stage upstream of the TRS. A Reynolds number of 350,000 was used, representative of a TRS in a narrow-body geared turbofan engine. The TRS performance was analyzed both at on- and off-design conditions and a thorough side-by-side comparison of CFD and experiments was performed. Static-pressure-distributions, turning and outlet flow-angles, wakes and losses, and surface-flow visualizations and outlet total pressure contours are presented. The thick vane showed good aerodynamic performance, similar to the regular vane. For the bump vane, the mount bumps were found to generate additional local separations and secondary flows, resulting in extra losses. In the regions with strong secondary flows CFD over-predicts the wakes, whereas the wakes around midspan, where secondary flows have a smaller influence, are predicted well
TEC
low-pressure turbine
TBH
TRF
exit guide vane
CFD
tail bearing housing
engine mount recess
bumps
turbine exhaust casing
CS2-RIA
Horizon 2020
turbine rear frame
experimental
turbine rear structure
outlet guide vane
polygonal shroud
821398
Clean Sky 2 Joint Undertaking
European Union (EU)
EATEEM
Author
Valentin Vikhorev
Chalmers, Mechanics and Maritime Sciences (M2), Fluid Dynamics
Pär Nylander
GKN Aerospace Sweden
Valery Chernoray
Chalmers, Mechanics and Maritime Sciences (M2), Fluid Dynamics
Jonas Larsson
GKN Aerospace Sweden
Oskar Thulin
GKN Aerospace Sweden
Journal of Engineering for Gas Turbines and Power
0742-4795 (ISSN) 1528-8919 (eISSN)
Vol. 144 7 071009Experimental Aero- and Thermal investigation for a next generation Engine Exit Module (EATEEM)
European Commission (EC) (EC/H2020/821398), 2018-10-01 -- 2021-03-31.
Subject Categories
Aerospace Engineering
Applied Mechanics
Fluid Mechanics and Acoustics
Infrastructure
Chalmers Laboratory of Fluids and Thermal Sciences
DOI
10.1115/1.4054075