Aerodynamic Damping Predictions During Compressor Surge: A Numerical Comparison Between a Half and Full Transient Approach

Abstract The prediction of the aerodynamic damping during compressor surge is a challenging task, because flow continuously evolving along four cycle phases: pressurization (PR), flow-breakdown (FB), reversed (RF), and regeneration (RG), complex conditions such as shocks separations occur. Damping predictions with current existing methods typically consist two steps. In first step, modified numerical model used to simulate transient cycles. second analyses are performed for multiple timesteps phases, which then assumed quasi-steady. simulation can be using nonlinear or linear approaches. If occur, latter yields inaccuracies in thus predictions. A new approach was developed take into account improve these inaccuracies. This method includes within simulation. Thus, all phases considered, simulations separations. results this presented compared former method.