The cooling systems encountered in aeronautical systems are characterised by the presence of highly turbulent flows. In particular, turbomachinery components exhibit elevated temperature levels, strong rotational effects, combined with a highly anisotropic turbulence. Modelling those flows has been the main subject of the research works I conducted...
Le givrage est un des phénomènes atmosphériques les plus sévères pour les aéronefs et les moteurs. Les évolutions récentes de la réglementation ont étendu les exigences de certification au cas des cristaux de glace. Pour ces conditions, les moteurs d’avion doivent démontrer un fonctionnement robuste en vol. Contrairement aux gouttes en surfusion re...
In this paper, the aeroelastic flutter stability of an impeller is investigated numerically with single passage and full annulus URANS simulations carried out on one side on a single stage configuration including a strut and the impeller and on the other side on a multistage configuration in which an additional diffuser and a stator vane are consid...
The elsA CFD software developed at ONERA is both a software package capitalizing the innovative results of research over time and a multipurpose tool for applied CFD and for multi-physics. elsA is intensively used by the Safran and Airbus groups and ONERA, as well as other industrial groups and research partners. This paper presents the main capabi...
This paper presents a hybrid grid strategy for the CFD modeling of complex technological effects which can be encountered on turbomachinery applications. It consists in mixing within the computational domain structured and non structured zones which are connected with conformal matching frontiers. The main channel flow path is meshed with a classic...
Non-invasive and accurate measurements are essential to study the reactive flows in aeronautical engines. This paper reports the results of a unique measurement campaign providing the temperature flowfield in a large scale facility turbomachine test rig using spontaneous rotational Raman scattering technique. Different planes of interest and operat...
Afin d'améliorer les caractéristiques d'une turbomachine, il est capital de prévoir correctement les écoulements secondaires et/ou transitionnels s'y développant. Ces écoulements peuvent être à l'origine de la réduction de ses performances et de son domaine de fonctionnement. A titre d'exemple la présence de tourbillons de jeu ou de décollements de...
Some possible future High Fidelity CFD codes for LES simulation of turbomachinery are compared on several test cases increasing in complexity , starting from a very simple inviscid Vortex Convection to a multistage axial experimental compressor. Simulations were performed between 2013 and 2016 b y major Safran partners (Cenaero, Cerfacs, CORIA and ...
This paper presents the status of current development and research activities concerning the modelling of aeroelastic phenomena of rotating machines. A first insight will be given into the activities conducted in the frame of stage and multi-stage configurations of compressors. A second topic will be addressed concerning the development of methodol...
L'objectif de cette thèse est de faire progresser la modélisation de la transition de couche limite sur des aubes de turbines basse-pression fortement chargées. Cette modélisation repose sur l'utilisation du modèle de transition de Menter et Langtry utilisé pour des calculs RANS dans le code elsA. Une fois les limitations du modèle de transition cl...
