22nd Congress of International Council of the Aeronautical Sciences, Harrogate, UK, 28 August - 1st September, 2000
Paper ICAS 2000-6.10.4

TURBOMACHINERY DESIGN USED INTENSIVE CFD

H. Joubert, H. Quiniou
Snecma, Villaroche, France

Keywords: turbine, compressor,aerodynamic, cfd, steady , unsteady, flutter

Computational Fluid Dynamics (CFD) tools represent a significant source of improvement in the design process of turbomachines, aiming to better performances, lower costs and associated risks. Snecma compressor and turbine design process relies intensively on CFD methods. In the 80s, the use of 3D Euler methods was the cornerstone of commercial fan design methodology meeting high level of efficiency. In the early 90s, 3D Navier-Stokes solver and unsteady 3D Euler solvers were introduced in design process. Hundreds of 3D Navier-Stokes calculations were run before the release of a compressor or a turbine. Numerical models are constantly improved to account for real geometry and include various technological effects (tip clearances, fillet radii, flowpath alignment, bleeds, cooling flows…) and multi stage simulations. This means to implement more complex turbulence models, transition simulation and to simulate unsteady phenomena This paper illustrates the effort made by Snecma to adapt these methods to design process following three patches: - Simulation improvement - CFD methods validation / calibration - Adaptation to designer environment

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