Instabilities <i>Everywhere!</i> Hard Problems in Aero-Engines

Abstract Many of the challenges that limited aero-engine operation in 1950s, 1960s, 1970s, and 1980s were static nature: hot components exceeding temperature margins, stresses high-speed rotating structure approaching safety limits, turbomachinery aerodynamic efficiencies missing performance goals. Modeling tools have greatly improved since helped enhance jet engine design, largely due to better computers simulations fluid flow supporting structure. The situation is thus different today, where important problems encountered past design development phases are dynamic nature. These can jeopardize certification lead major delays increased program costs. A real challenge characterization damping related behavior stationary assemblies, fluid–structure interactions coupling. theme this lecture instability broadest sense. number technological interest aero-engines discussed with a focus on dynamical system modeling identification underlying mechanisms. Future perspectives outstanding seminal grand also given.