Application of the Time Linearized Euler Method to Flutter and Forced Response Calculations

Abstract

The Time Linearized Euler Method has proven to be a useful design tool, capable of predicting unsteady flows in turbomachinery within the accuracy required for engineering purposes while being fast enough for routine use in the design process. This paper first briefly describes the approach and its implementation in the current method. A range of applications of the method is described for flutter calculations in turbines and compressors with different levels of complexity such as chord wise bending, single or clustered airfoils, sub- or transonic flow. Farced response calculations are shown for airfoils passing through wakes and for a rotor operating in the pressure field of a downstream outlet guide vane. The results are presented as aerodynamic damping, unsteady work distributions and unsteady flowfield plots. Data shown includes information on boundary conditions, mesh size, computation time and convergence histories. The paper provides insight into an industry approach to modeling unsteady turbomachinery flows.