Subsonic stall flutter analysis in 2D blade cascade using hybrid boundary element method

0535111 - ÚT 2021 RIV GR eng C - Conference Paper (international conference)
Prasad, Chandra Shekhar - Pešek, Luděk
Subsonic stall flutter analysis in 2D blade cascade using hybrid boundary element method.
EURODYN 2020. Vol. 1. Athens: National Technical University of Athens (NTUA), 2020 - (Papadrakakis, M.; Fragiadakis, M.; Papadimitriou, C.), s. 213-224. ISBN 978-618-85072-0-3.
[EURODYN 2020 /11./. Athény (GR), 23.11.2020-26.11.2020]
R&D Projects: GA TA ČR(CZ) TN01000007
Institutional support: RVO:61388998
Keywords : stall flutter * aeroelasticity * boundary element method * discrete vortex particle method * panel method * blade cascade * Viscous-inviscid coupling
OECD category: Applied mechanics

In this paper study of subsonic stall flutter in the steam turbine blades is carried out. Subsonic stall flutter is one of the dominating and frequently occurring aeroelastic phenomena in large power turbines. The study is carried out by both experimentally and numerically to understand the fundamental physics behind it. Aerodynamics damping (AD) is one of the parameter to analyze the aeroelastic stability of stall flutter in 2D blade cascade. To numerically model the stall flutter in steam turbine a medium fidelity numerical tool is developed. In this research project computationally less expensive potential flow based hybrid boundary element method e.g. panel method, flow model is developed to model the unsteady flow in low pressure turbine blade cascade and to estimate the aeroelastic stability (stall flutter) parameters. A
modified version panel method using viscous-inviscid coupling including discrete vortex particle (DVM) free wake model can be used for the separated flow conditions as it is in stall flutter case. These methods are widely adopted for aeroelastic modeling of wind turbines, helicopter rotors, and aircraft aeroelasticity problem . The AD for different Inter blade phase angle (IBPA) is estimated using newly developed hybrid BEM based flow model. The estimated AD will be compared with experimental data and CFD results to evaluate the efficiency and the accuracy of the model.

Permanent Link: http://hdl.handle.net/11104/0315414