Performance Evaluation of Axial-Flow Turbomachinery Using Variable Control Technology and Analysis of Energy Savings Based on Operation Scenarios

This study evaluates the performance and energy saving potential of axial-flow turbomachinery with variable control technologies. An axial pump with variable inlet guide vanes (0∼45°) and an axial fan with variable pitch blades (62∼84°) were tested. Performance evaluation showed that variable control reduced the saddle region and expanded stable operating range. Based on actual operational data from sewage treatment plants, tunnels, and subway stations, operating scenarios were established. Results demonstrated energy savings of 10.2∼19.3 % for pumps and 50.3∼66.4 % for fans compared to fixed control. Variable control significantly improved both operational stability and energy efficiency in axial-flow turbomachinery.