Experimental and numerical flow analysis of an engine-realistic state-of-the-art turbine rear structure
Paper in proceeding, 2021

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.

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low-pressure turbine



engine mount recess

exit guide vane

European Union (EU)




tail bearing housing

polygonal shroud

Horizon 2020



turbine rear frame

turbine exhaust casing

outlet guide vane

Clean Sky 2 Joint Undertaking

turbine rear structure



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

Proceedings of the ASME Turbo Expo

Vol. 2B-2021 32A008
9780791884911 (ISBN)

ASME Turbo Expo 2021 Virtual Conference and Exhibition
Online, ,

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.

Driving Forces

Sustainable development

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Subject Categories

Aerospace Engineering

Energy Engineering

Fluid Mechanics and Acoustics


Basic sciences


Chalmers Laboratory of Fluids and Thermal Sciences



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