Hydroelastic analysis of Pre-Swirl Stator

Abstract

This paper presents the investigation of the dynamic effects in the structural response of a Pre-Swirl Stator. The implemented model is based on the modal superposition which improves the efficiency of the hydro-structural coupling. Structural response is decomposed into a set of orthogonal dry modes which are computed in the pre-processing stage. Mode shape displacement vectors are interpolated from the structural nodes onto the fluid mesh on the selected merging interface. This allows the dynamic equation solution directly inside the fluid solver. Compared to the standard hydro-structural interaction which requires additional iterations between the structure and fluid models per time-step, this approach reduces the complexity and computational effort. Model is verified on a simplified PSS simulation setting and computational guidelines are derived. The PSS is further analysed on the realistic cases of propeller and wave loads with the hydroelastic effects included. The results suggest a negligible amount of dynamic amplification in the current PSS design.