Effects of Rotation on the Flow Structure in a Compressor Cascade
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Tipus de documentText en actes de congrés
Data publicació2021
EditorAmerican Society of Mechanical Engineers (ASME)
Condicions d'accésAccés restringit per política de l'editorial
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Abstract
In turbomachines, rotors and stators differ by the rotation of the former. Hence, half of each stage is directly influenced by rotation effects. The influence of rotation on the flow structure and its impact on the performance is studied through Wall-Resolving Large Eddy Simulations of a rotor with large relative tip gap size. The simulations are performed in a rotating frame with rotation accounted for through a Coriolis force term. In a first step experimental results are used to provide validation. The main part of the study is the comparison of the results from two simulations, one representing the rotating configuration, one with the Coriolis force removed, without any other change. This setup allows very clean assessment of the influence of rotation. The turbulenceresolving approach ensures that the turbulent flow features are well represented. The results show a significant impact of rotation on the secondary flow. In the tip region the Tip Leakage Vortex is enlarged and destabilised. Inside the tip gap the flow is altered as well, with uniformization in the rotating case. At the blade midspan, no significant effects are observed on the suction side, while an earlier transition to turbulence is found on the pressure side. Near the hub, rotation effects are shown to reduce the corner separation significantly.
CitacióVentosa-Molina, J. [et al.]. Effects of Rotation on the Flow Structure in a Compressor Cascade. A: ASME Turbo Expo - Turbomachinery Technical Conference & Exposition. "Proceedings of the ASME Turbo Expo 2021: Turbomachinery Technical Conference and Exposition. Volume 2A: Turbomachinery -Axial Flow Fan and Compressor Aerodynamics: virtual, online, June 7-11". American Society of Mechanical Engineers (ASME), 2021, p. 1-12. ISBN 978-0-7918-8490-4. DOI 10.1115/GT2021-58793.
ISBN978-0-7918-8490-4
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GT2021-58793.pdf | Article enviat a congrés | 8,273Mb | Accés restringit |