Cadence Techtalk: Blade Flutter Assessment of a Steam Turbine Stage with Fidelity CFD

Date: March 23, 2023
Time: 9:00am PDT | 11:00am CDT | 5:00pm CET

Steam turbines are indispensable in the energy industry today. As engineers strive to extract more potential energy from pressurized steam, the current trend is designing longer and lighter blades. Typically, blades in the low-pressure stages of a steam turbine can be longer than 1m, making them susceptible to flutter, a major structural concern. Simulating flutter requires modeling the fluid-structure interaction (FSI) through CFD analysis. FSI simulations are challenging, involving mesh deformation techniques, complex modeling, and the unsteadiness of the flow.

Cadence’s solutions include all tools necessary to perform a complex fluid-structure interaction simulation. The combination of the nonlinear harmonic method (NLH) and modal analysis provides an accurate assessment of the risks associated with flutter while saving significant engineering and CPU time compared to full URANS simulations.

In this 60-minute webinar, we will discuss using Cadence’s CFD platform Fidelity to:

  • Calculate mode shapes and natural frequencies of a solid turbine stage model
  • Perform flutter analysis of a complete steam turbine stage, including hub and shroud cavities, using the harmonic method