Description du projet
Analyse multiphysique des instabilités thermoacoustiques dans les chambres de combustion annulaires
Les concepts de turbines à gaz avancés, dont les chambres de combustion annulaires, sont sujets à des instabilités thermoacoustiques. Ces phénomènes peuvent générer d’importantes fluctuations de pression qui affectent les performances et l’intégrité structurelle des turbines stationnaires et des moteurs d’avion. La plupart des études relatives à ces instabilités se sont appuyées sur des flammes isolées et axisymétriques qui ne rendent qu’imparfaitement compte de la dynamique complexe des turbines. Le projet TAIAC, financé par le CER, se propose d’étudier les instabilités thermoacoustiques dans les chambres annulaires, et notamment la multiphysique complète du système. Pour ce faire, l’équipe mettra au point un nouveau type d’installation annulaire avec des conditions limites pertinentes pour le moteur, permettant une caractérisation 3D complète des écoulements fortement asymétriques, des modèles prédictifs améliorés et une conception intelligente.
Objectif
It is well known that current and future low-emission combustion concepts for gas turbines are prone to thermoacoustic instabilities. These give rise to large pressure fluctuations that can drastically reduce the operable range and threaten the structural integrity of stationary gas turbines and aero engines. In the last 6 years the development of laboratory-scale annular combustors and high-performance computing based on Large Eddy Simulations (LES) have been able to reproduce thermoacoustic oscillations in annular combustion chambers, giving us unprecedented access to information about their nature.
Until now, it has been assumed that a complete understanding of thermoacoustic instabilities could be developed by studying the response of single axisymmetric flames. Consequently stability issues crop up far into engine development programmes, or in service, because we lack the knowledge to predict their occurrence at the design stage. However, the ability to experimentally study thermoacoustic instabilities in laboratory-scale annular combustors using modern experimental methods has set the stage for a breakthrough in our scientific understanding capable of yielding truly predictive tools.
This proposal aims to break the existing paradigm of studying isolated flames and provide a step change in our scientific understanding by studying thermoacoustic instabilities in annular chambers where the full multiphysics of the problem are present. The technical goals of the proposal are: to develop a novel annular facility with engine relevant boundary conditions; to use this to radically increase our understanding of the underlying physics and flame response, paving the way for the next generation of predictive methods; and to exploit this understanding to improve system stability through intelligent design. Through these goals the proposal will provide an essential bridge between academic and industrial research and strengthening European thermoacoustic expertises.
Champ scientifique
- natural sciencesphysical sciencesclassical mechanicsfluid mechanicsfluid dynamics
- natural sciencesphysical sciencesacoustics
- natural sciencescomputer and information sciencescomputational sciencemultiphysics
- natural sciencescomputer and information sciencessoftwaresoftware applicationssimulation software
- engineering and technologyenvironmental engineeringenergy and fuelsenergy conversion
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Programme(s)
Thème(s)
Régime de financement
ERC-STG - Starting GrantInstitution d’accueil
7491 Trondheim
Norvège