Experimental and Numerical Study of Laminar-Turbulent Transition on a Low-Pressure Turbine Outlet Guide Vane
Journal article, 2021

This work presents an experimental and numerical investigation on the laminar-turbulent transition and secondary flow structures in a Turbine Rear Structure (TRS). The study was executed at engine representative Reynolds number and inlet conditions at three different turbine load cases. Experiments were performed in an annular rotating rig with a shrouded low-pressure turbine upstream of a TRS test section. The numerical results were obtained using the SST k–ω turbulence model and the Langtry- Menter γ–θ transition model. The boundary layer transition location at the entire vane suction side is investigated. The location of the onset and the transition length are measured using IR thermography along the entire vane span. The IR-thermography approach was validated using hot-wire boundary layer measurements. Both experiments and CFD show large variations of transition location along the vane span with strong influences from endwalls and turbine outlet conditions. Both correlate well with traditional transition onset correlations near midspan and show that the transition onset Reynolds number is independent of the acceleration parameter. However, CFD tends to predict an early transition onset in the midspan vane region and a late transition in the hub region. Furthermore, in the hub region, CFD is shown to overpredict the transverse flow and related losses.

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tail bearing housing


engine exit structure

low pressure turbine

turbineexhaust casing

secondaryflow structures


Horizon 2020

European Union (EU)



Clean Sky 2 Joint Undertaking

turbine rear structure




Isak Jonsson

Chalmers, Mechanics and Maritime Sciences (M2), Fluid Dynamics

Srikanth Deshpande

GKN Aerospace Sweden

Valery Chernoray

Chalmers, Mechanics and Maritime Sciences (M2), Fluid Dynamics

Oskar Thulin

GKN Aerospace Sweden

Jonas Larsson

GKN Aerospace Sweden

Journal of Turbomachinery

0889-504X (ISSN) 15288900 (eISSN)

Vol. 143 10 101011

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

Energy Engineering

Fluid Mechanics and Acoustics


Chalmers Laboratory of Fluids and Thermal Sciences



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6/3/2022 2