PhD Intentional aeroelastic design of fan blades

  • Écully, Rhône
  • 2 307 €/mois
  • CDD
  • Temps-plein
  • Il y a 27 jours
Offer DescriptionThe transition towards climate-neutrality poses significant technological hurdles for turbomachines, particularly in aviation propulsion systems. Among these challenges, the optimization of flexible rotor blades under high aerodynamic loads stands out as a major concern. As rotor blades deform statically and dynamically when subjected to complex fluid-dynamic forces, the aeroelastic interaction poses a risk of component failure. Current engineering approaches rely heavily on generous safety margins and over-designed rotor blades, resulting in increased weight and fuel consumption. Intentional aeroelastic design holds the potential for a transformative leap in technology. However, realizing this potential is hindered by the limitations of existing methods. Accurate and rapid aeroelastic prediction methods are lacking, and there are significant gaps in understanding fluidstructure interactions in complex turbomachinery systems. Addressing these challenges, the newly established CONDOR chair proposes a comprehensive research program in collaboration between Safran Aircraft Engines and Ecole Centrale de Lyon. The focus is on investigating aeroelastic instabilities in modern fan and compressor architectures for civil aircraft, particularly those with Ultra-High-Bypass-Ratio. One prevalent instability identified is Non-Synchronous Vibrations (NSV), which restrict the operating range of the machine. Despite advancements in numerical methods, simulating and predicting NSV remains challenging. Fan blades, constructed from layered composites, undergo a complex design process involving Finite-Element Modeling and coupled URANS solvers for aeroelastic simulations. However, these simulations are time-consuming and impractical for assessing the entire operating range and variations of countermeasures against aeroelastic instability. To overcome these limitations, the proposed thesis aims to redefine the design process by integrating reduced-order models that capture modal frequencies and shapes based on composite layup patterns. By coupling these models with an aeroelastic CFD solver and developing a system model for NSV, the objective is to enable intentional tailoring of structural design in a closed loop. This approach seeks to move beyond conventional design rules and optimize composite layup patterns as a key parameter. Success in this endeavor could revolutionize turbomachinery design, unlocking a vast potential for optimization. The thesis will focus on creating and validating reduced-order models, conducting sensitivity studies using fluid-structure coupled CFD simulations, developing a system model for NSV, and deriving aeroelastically optimized composite patterns. The study will utilize the open-test-case transonic fan ECL-5 developed at Centrale Lyon and tested in the CATANA project. While validation methods for FEM and CFD simulations are established, the primary focus will be on advancing the required reduced-order models and system modeling. The applicant will work closely with both the research group at Ecole Centrale de Lyon and Safran Aircraft Engines, requiring strong communication and teamwork skills. The anticipated start date for the thesis is summer 2024, with a duration of 36 months. The applicant will collaborate with experienced researchers and technicians in the Turbomachinery group of the Fluid Mechanics and Acoustics Laboratory. A solid background in numerical methods, fluid dynamics, structural mechanics, and turbomachinery aerodynamics is essential for prospective candidates.RequirementsResearch Field Engineering Education Level Master Degree or equivalentSkills/QualificationsAll work must be conducted in coordination with the research group, requiring excellent communication and teamwork. It is expected that the applicant has a solid background in numerical methods, fluid dynamics and structural mechanics as well as fundamentals in turbomachinery aerodynamics.Languages ENGLISH Level ExcellentResearch Field Computer scienceEngineeringMathematicsPhysics Years of Research Experience 1 - 4Additional InformationBenefits3 year contract with Ecole Centrale de LyonMonthly gross salary 2023 : 2 307€Eligibility criteriaApplicants must be in a position to complete a master by research degree or an equivalent diploma (before the beginning of the PhD position) or have completed (
4 years) a master by research degree or an equivalent diploma.Selection processSelection process After pre-selection of candidates based on the CV, individual interviews with the thesis directors and the partner institutes will be conducted.Work Location(s)Number of offers available 1 Company/Institute ECOLE CENTRALE DE LYON Country France City ECULLY Postal Code 69130 Street 36 avenue guy de collongue GeofieldWhere to apply WebsiteContact State/ProvinceFrance CityEcully WebsiteStreet36, av Guy de Collongue Postal Code69130 E-Mailbenedicte.martin@ec-lyon.frSTATUS: EXPIRED

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