Flutter methodology using reduced order aeroelastic model

0549611 - ÚT 2022 RIV CZ eng V - Research Report
Prasad, Chandra Shekhar - Pešek, Luděk - Šnábl, Pavel
Flutter methodology using reduced order aeroelastic model.
Praha: Ústav termomechaniky AV ČR, v. v. i., 2021. 24 s.
R&D Projects: GA TA ČR(CZ) TN01000007
Institutional support: RVO:61388998
Keywords : reduced order model (ROM) * classical flutter * steam turbine blade * panel method
OECD category: Applied mechanics

The present research project is focused on development of fast and efficient numerical method based on reduced order aeroelastic method (ROAM) for modeling and analysis of
classical flutter in the low pressure (LP) stage steam turbine blade. Stability diagram such as aerodynamic damping (AD) of aeroelasticity of cascade of 3D turbine blades used as a prime
characterization factor. In the calculation of the S-curve/AD, the problem of classical flutter formation associated with running waves is considered here. Running waves is simulated by
the inter-blade phase shift of the blades in the cascade. Panel method based boundary element flow solver is employed for calculation of unsteady aerodynamic forces. This method is good
compromise of speed and accuracy for the estimation of the stability of the blades on a classical flutter. One way loose coupling technique between PM based flow solver and the structural
model. For the structural part modal model synthesis (MMS) method is adopted in the ROAM solver. MMS is adopted to further reduced the computational cost. The ROAM simulated AD
and pressure distribution over blade is compared high fidelity CFD data on real blade geometry provided by Doosan Skoda Power s.r.o. Furthermore, the ROAM results are also compared
with experimentally obtained results on two different linear cascade. The ROAM model shows good agreement with linear cascade results, however, there is noticeable discrepancy with real blade CFD results.
Permanent Link: http://hdl.handle.net/11104/0327470