Resonance Analysis of Single Screw Expander Based on Compressed Air Energy Storage System

Abstract

Abstract As an important technology to achieve energy restructuring, electricity storage plays an important role in the mission of carbon neutrality in today’s society. Compressed air energy storage is one of the most promising technologies for medium- and small-scale power storage. Single screw expander as an important energy conversion equipment in the compressed air energy storage, the stability of its performance is the key to ensure the normal operation of the energy storage system. In this study, based on the resonance problem of single screw expander in variable speed operation and the modal parameters of internal key components structure, the research is carried out. The results show that: The single screw expander can cause a large resonance damage when the rotational speed is working under 1950 – 2380 rpm. The natural modal frequencies of gate rotor, screw rotor and main shaft are not the cause of resonance. Through the work of this study, the influence of internal key components structure on resonance is eliminated, and the next research direction is defined.