Prediction of flutter effects on transient flow structure and aeroelasticity of low-pressure turbine cascade using direct numerical simulations

Win Naung, Shine, Erfanian Nakhchi Toosi, Mahdi and Rahmati, Mohammad (2021) Prediction of flutter effects on transient flow structure and aeroelasticity of low-pressure turbine cascade using direct numerical simulations. Aerospace Science and Technology, 119. p. 107151. ISSN 1270-9638

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Official URL: https://doi.org/10.1016/j.ast.2021.107151

Abstract

The aerodynamic characteristics of advanced low-pressure turbines could be affected by the interaction between the transitional and turbulent flow and the dynamic behaviour of the blades. Consequently, analysing the details of the interactions between the transient flow, blades vibrations, and the flutter occurrence over the blades in LPTs, are essential in order to enhance the aerodynamic efficiency of the modern LPT turbines. The distinctive feature of the present analysis is performing high-fidelity simulations based on a DNS approach employing a 3D blade model to investigate the flutter instabilities in a T106A turbine at various inter blade phase angles (IBPAs) at different Reynolds numbers. The impacts of the flutter on the transient flow structure are examined by using a direct numerical simulation method. The results show that at IBPA=0∘, persistent patterns of vortex generation are detected with fluid flow mixing in the downward areas. For IBPA=180∘, however, the recirculation generated by the upper blades proceeds toward the lower ones and interfere with the shedding from the trailing edge which impact the wake structure in the downstream regions significantly. A three-dimensional frequency domain model based on the harmonic balance method is also proposed in this study to investigate the capabilities and limitations of frequency domain methods in predicting aeroelasticity and details of flow structures in LPTs.

Item Type: Article
Additional Information: Funding information: The authors would like to acknowledge the financial support received from the Engineering Physics and Science Research Council of the UK (EPSRC EP/R010633/1).
Uncontrolled Keywords: Direct numerical simulations, Low-pressure turbine, Wake interaction, Vortex generation, Separated shear layer
Subjects: H300 Mechanical Engineering
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: Elena Carlaw
Date Deposited: 08 Oct 2021 10:24
Last Modified: 15 Oct 2021 09:15
URI: http://nrl.northumbria.ac.uk/id/eprint/47444

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