Investigation of Different Rotational Speed Characteristics of Multistage Axial Compressor in CAES System

An axial compressor has high efficiency under design conditions, but its stable working range is narrow. Adjusting the rotational speed can effectively expand range. In this paper, a five-stage for specific compressed air energy storage (CAES) system taken as research object, and different (DRS) characteristics are studied with NUMECA software. Firstly, influence of DRS on overall aerodynamic performance explored, flow increased from 11.5% to 54.0%. Secondly, effect inlet parameters first stage rotor analyzed, reasonable distribution obtained. Thirdly, changing law internal investigated at DRS. The corner separation gradually enhanced when increases, leakage velocity tip improves. Finally, loss clearance researched. result shows that increases significantly in both circumferential spanwise directions increases. This work aims provide reference efficient operation compressors CAES systems wide