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Coupled thermomechanical fluid-structure interaction in the secondary air system of aircraft engines: contribution to an integrated design method

Abstract : In jet engines, the secondary air system, or SAS, takes care of a variety of important functions. In particular, secondary air flows control material temperatures and thermal expansion of engine parts, especially seal clearances. To check the fulfilment of these functions in the engine design phase, gas properties, temperatures, pressures and mass flow rates, must be accurately predicted. Up to now, the aerodynamic calculations leading to mass-flow rates, fluid pressures and temperatures and the thermal calculations yielding material temperatures are performed separately. A lot of interactions are neglected, the treatment of which would require numerous time consuming iterations. Indeed, material temperature changes lead to a modification of the expansion of the interacting parts yielding significant modifications in the gaps which control mass-flow rates. Since gap width has an important influence on the pressure losses, the interaction between aerodynamic, thermal and solid mechanics solution to the problem is expected to be important. The present investigation aims at taking this interaction into account in a robust analysis tool, combining SAS, thermal and mechanical analysis. An integrated program suite has been created, which allows to calculate these effects steady state. The basic concept is a network consisting of nodes representing the chambers and connected by pressure loss elements. Using a finite-element-compatible formulation, the network is embedded in a thermo-mechanical finite element model of the engine within an unique model and solved using the free software finite element CalculiX. This is done in the form of a module in which the gas pressure temperature and mass-flow are calculated based on the structural temperature and deformation of the previous iteration and serve as boundary conditions to the thermo-mechanical model for the next iteration.
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Submitted on : Tuesday, December 1, 2020 - 10:17:44 AM
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  • HAL Id : tel-03032916, version 1

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Yannick Muller. Coupled thermomechanical fluid-structure interaction in the secondary air system of aircraft engines: contribution to an integrated design method. Mechanics [physics.med-ph]. Université de Valenciennes et du Hainaut-Cambrésis, 2009. English. ⟨NNT : 2009VALE0020⟩. ⟨tel-03032916⟩

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