Fluid-structure interaction of wind-turbine and aerospace structures

At LMSSC, Cnam, Paris, June 22th 2012, 14 p.m.

In Lee
Professor, School of Mechanical, Aerospace and Systems Engineering,
Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Korea

Flight vehicles experience aeroelastic problems due to the interaction between structures and aerodynamic loads. Aeroelastic instability is generally a critical problem in transonic or lower supersonic regions. Therefore, fluid-structure interaction analyses of several flight vehicles have been performed using the coupled techniques of transonic small-disturbance (TSD) and computational structural dynamics (CSD). The aeroelastic characteristics based on several aircraft models are investigated using the developed aeroelastic analysis system.

The flow-field around the rotary wings such as wind turbines and helicopters is particularly complicated and unstable because the unsteady wake is generated by rotating blades. Due to the unstable flow-field, the rotor blades are exposed to a severe vibratory environment for considerable amounts of time. For this reason, the analyses of fluid-structure interaction of the wind turbines and helicopter rotors have been conducted to investigate aeroelastic behavior and stability under operational conditions. A large deflection beam theory with a one-dimensional model is employed to a structural model for an examination of the non-linear blade responses. Also, a free-wake model based on vortex lattice method is used in order to take into account wake effects. The responses obtained from present analysis of fluid-structure interaction are compared with those of the previously studies and experimental data for verification.

Laboratoire de Mécanique des Structures et des Systèmes Couplés - LMSSC