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Analyse et contrôle de l'écoulement de jeu d'une aube fixe isolée

Abstract : This study aims at providing a detailed description of the tip-leakage flow, in order to analyzeits sensitivity to design parameters and to control devices based on air injection from the casing. The setup iscomposed of a single blade, set orthogonal to a flat plate that plays the role of the casing wall. The analysis isbased on experiments conducted in a low-speed wind tunnel that are complemented by CFD calculations. Thetip-leakage flow is primarily driven by the gap height. The incoming boundary layer thickness and the bladeloading also have a notable effect on the lateral position of the tip-leakage vortex. The distribution of local entropycreation rate has been used to identify areas of losses in the flow. Moreover, the total pressure losses have beendecomposed in two terms identified as a vortex loss and a wake loss. This vortex loss drives the increase of totalpressure losses with the gap height. An empirical model has been developped to predict the evolution of thetip-leakage vortex circulation and of the total pressure losses with respect to the gap height. A steady injection ofair from the casing has been evaluated, using normal jets in the gap. With this control strategy, the tip-leakagevortex tends to be closer to the blade, which could lead to an extension of the range of stable operation for axialcompressors. In addition to that, the control device smoothes out the axial vorticity field in the tip-leakage vortex,which could be interesting to reduce rotor-stator interactions. However, this control strategy leads to higher totalpressure losses and is less effective with larger gaps.
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https://hal.archives-ouvertes.fr/tel-03003331
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Submitted on : Friday, November 20, 2020 - 11:51:10 AM
Last modification on : Tuesday, November 24, 2020 - 2:18:30 PM

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  • HAL Id : tel-03003331, version 2

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Benjamin Deveaux. Analyse et contrôle de l'écoulement de jeu d'une aube fixe isolée. Mécanique des matériaux [physics.class-ph]. HESAM Université, 2020. Français. ⟨NNT : 2020HESAE009⟩. ⟨tel-03003331v2⟩

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