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Demonstrator for Aircraft heat exchanger LIfe prediction

Description du projet

Modéliser les échangeurs de chaleur des avions

L’utilisation des échangeurs de chaleur est très répandue dans l’industrie aérospatiale, principalement pour les circuits hydrauliques de refroidissement, les groupes auxiliaires de puissance, les boîtes de vitesse et pour d’autres composants aéronautiques. Les échangeurs de chaleur en métal sont généralement fiables et durables, mais des contraintes et une utilisation prolongée peuvent avoir un impact négatif sur leurs composants. Une meilleure compréhension du processus de vieillissement de l’échangeur de chaleur est essentielle pour améliorer sa conception et prévoir les défaillances. Le projet DALI, financé par l’UE, est en train de mettre au point un puissant outil de simulation permettant de tester virtuellement les échangeurs de chaleur. Il sera capable de modéliser les contraintes, les cycles thermiques, la fatigue thermique (qui provoque des fissures), éliminant le besoin de recourir à des essais physiques.

Objectif

DALI aims at validating a virtual testing approach so that design and test loop can be shortened and tests can be partly replaced, applied on the development of future generation of compact heat exchangers, for the engine innovative bleed system; with higher requirements and thus damage probability. DALI proposes a fully integrated modelling platform where damage laws will be integrated relying on a multiphysics and multilevel modelling approach. A robust and reliable solution will be implemented based on an improved understanding of specific phenomena occurring during thermo mechanical ageing of heat exchanger in aircraft. The mainstream will enable to reproduce the thermal cycling ageing and its statistical probability by multiphysics simulations, and a set of master datasheets of fatigue curves and damage laws Manufacturing variability (local deformations, initial stress state), and other design variables will be included. The proposed validation scheme includes a set of details of increasing complexity where the simulation approach and the instrumented physical testing will be compared, and iteratively improved, so that real observations of cracking coming from Aircraft exploitation can be predicted. A representative coupon test plan and an innovative measurement to detect cracks initiation in non visible areas will be included. The prediction capacity will allow mastering the heat exchanger behaviour and the mean-time-between-failures, MTBF, to tailor the heat exchanger design, including sensitivity analysis for potential optimization. DALI stands on members’ skills and their cross advanced FEM knowledge capacities to enable a seamless technical coordination through the combination of customized experimental validation and advanced simulation so that a) an accelerated test approach can be implemented for in service life assurance, b) a degradation law that could be used in combination with a simplified and accurate simulations for future CHX precooler sizing.

Régime de financement

IA - Innovation action
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Coordinateur

EPSILON INGENIERIE
Contribution nette de l'UE
€ 364 962,50
Adresse
Rue tarfaya batiment b612
31400 Toulouse
France

Voir sur la carte

Région
Occitanie Midi-Pyrénées Haute-Garonne
Type d’activité
Private for-profit entities (excluding Higher or Secondary Education Establishments)
Liens
Autres sources de financement
€ 168 912,50

Participants (2)