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Analysis of Performance Sensitivity to Geometrical Variations of a Modern Helicopter Engine Combustor Using LES Simulations

[+] Author Affiliations
Guillaume Vignat, Guillaume Taliercio, Jean Lamouroux, Nicolas Savary, Patrick Duchaine

Safran Helicopter Engines, Bordes, France

Sébastien Da Veiga

Safran Tech, Paris-Saclay, France

Paper No. GT2017-64249, pp. V04BT04A003; 11 pages
doi:10.1115/GT2017-64249
From:
  • ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition
  • Volume 4B: Combustion, Fuels and Emissions
  • Charlotte, North Carolina, USA, June 26–30, 2017
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-5085-5
  • Copyright © 2017 by ASME

abstract

When a gas turbine combustor is manufactured, small geometrical differences between production runs are unavoidable. These geometrical differences potentially influence performances such as service life, lighting, lean blow off, pollutant emissions. To ensure performances, manufacturing tolerances are kept tight enough so as to neglect their impact. However, loosening some key manufacturing tolerances can result in lower manufacturing costs, while maintaining combustion performances at a satisfactory level. The present study aims at challenging some cost-driving manufacturing tolerances of Safran Helicopter Engines new turboshaft combustor, using state-of-the-art 3D numerical tools. The objective is to guarantee robust and long lasting combustor performances at a reasonable manufacturing cost. To this purpose, an optimized Latin Hypercube Sampling of 30 geometrical configurations around the nominal geometry has been simulated with a 3D LES solver. Simulation parameters had to be chosen to keep computation costs manageable and to have a high representability when comparing geometries. These aspects are checked using theoretical considerations and comparisons with both experimental data and previously validated simulations. The temperature field at the combustion chamber exhaust has been analyzed in detail using metamodeling. In particular, the Radial Temperature Distribution Factor (RTDF) at the combustor outlet appears to be robust. Such large designs of numerical experiments (DonE) are computationally expensive but they provide a reliable tool to assess the robustness of a combustor design, and define optimized manufacturing tolerances.

Copyright © 2017 by ASME

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