Session: 32-05 Low Pressure Turbines 2

Paper Number: 123798

123798 - Unsteady Flow Simulations of a Transonic Low-Pressure Turbine Cascade 

High-speed low-pressure turbine blades (HS-LPT) are a key component in the development of high-efficiency geared engine architectures. High-fidelity CFD simulations are progressively being integrated into the design process of engine components, to get a better insight in the complex flow behavior and guide the shape optimization process.

The current study presents Very-Large Eddy Simulations (VLES) of the flow across a HS-LPT, using Lattice-Boltzmann Methods (LBM). Different solvers of the commercial software SIMULIA PowerFLOW® have been used for this study.

The selected benchmark case is the SPLEEN cascade, a next-generation HS-LPT cascade rig developed by Von Karman Institute and Safran Aircraft Engines, as part of a large European collaborative project. A subset of the large amount of available test rig data has been used here to benchmark the CFD solver.

Hence, the study aims at assessing the ability of this numerical methodology to predict several complex flow phenomena occurring at engine relevant Mach and Reynolds numbers. We observed (1) unsteady transonic flows, (2) laminar separation bubble, (3) natural laminar-to-turbulent transition, (4) unsteady bypass transition due to wake impingement coming from upstream turbulence, (5) endwall 3D effects, (6) corner stall separation and (7) fluctuation of the flow due to periodic wakes coming from translating bars representing wakes of the upstream rotor.

Presenting Author: Liza Hullin Dassault Systemes SE

Presenting Author Biography: Newly employed as EUROWEST SIMULIA Industry Process Consultant at Dassault Systemes, where I completed my end-of-studies internship. I graduated from IPSA Toulouse, an aeronautical and space engineering university, where I specialized in mechanical engineering and structures. I developed skills in Computer Aided Design and Finite Element Model for the aeronautical sector. My internship was the opportunity to develop CFD expertise applied to turbomachinery subjects.
I now work upon numerical fluid dynamics challenges within the transport and mobility industry.

Authors:

Liza Hullin Dassault Systemes SE
Ignacio Gonzalez-Martino Dassault Systemes SE
Benoit Bonnal Dassault Systemes SE