Surge Exploration Tests and Second Quadrant Characteristic Dynamic Modeling on Full-Scale Centrifugal Compressor

Abstract

Surge exploration tests on a full-scale centrifugal compressor have been performed allowing an evaluation of the transient behavior and the mechanical robustness of the compressor even during a critical event such as Surge. The result of this work is a breakthrough for the tuning of a centrifugal compressor model to be used for dynamic simulations and prediction of compressor dynamics during Surge events in a more reliable and robust way. Surge exploration tests results analysis, in terms of vibrations, axial displacements and thrust loads, together with development of a compressor enhanced dynamic model, allowed a change from a Surge acceptance criterion,based on the time spent on the left of the Surge Limit Line, to a more physics related criterion, based on the acceptable number of Surge cycles, thus optimizing the selection of additional protections, such as hot/cold gas bypass valves.