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Numerical simulations of aeroelastic instabilities in a turbine-blade cascade by a modified Van der Pol model at running excitation

2023; University of West Bohemia; Volume: 17; Issue: 1 Linguagem: Inglês

10.24132/acm.2023.792

2336-1182

Lukáš Pešek, Pavel Šnábl, Chandra Shekhar Prasad, Y. Delanney,

Turbomachinery Performance and Optimization

The onset and spread of flutter in a turbine blade cascade are numerically studied. Due to the application of the reduced-cascade model consisting of simple elements (springs, rigid bodies, linear dampers) and aeroelastic forces introduced by the analytical Van der Pol model, it is useful to study the dangerous states of vibration of such complicated turbine parts. This study examines aeroelastic instabilities of a 10-blade cascade at running excitation that arise due to wakes flowing from the stator blades to the rotating blades. Unlike our previous work, it brings a new definition of the Van der Pol model of self-excitation that is controlled by relative inter-blade motion of neighbouring blades.