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


low-pressure turbine



exit guide vane


tail bearing housing

engine mount recess


turbine exhaust casing


Horizon 2020

turbine rear frame


turbine rear structure

outlet guide vane

polygonal shroud


Clean Sky 2 Joint Undertaking

European Union (EU)



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 071009

Experimental 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


Chalmers Laboratory of Fluids and Thermal Sciences



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