A Review of Turbine and Compressor Aerodynamic Forces in Turbomachinery

Aerodynamic forces due to blade-tip clearance eccentricity are a known destabilizing source in rotating machinery with unshrouded impellers. Dynamic also appear shrouded impellers, changes the pressure gap between impeller casing and its shroud. These load-dependent typically characterized by cross-coupled stiffness coefficient (k > 0). This paper reviews archival literature for quantification of induced impeller-casing both turbines compressors. Most distinctive lack experimental results indiscriminate application simple formulas predict k, including Alford’s Wachel’s equations. The disparity estimations k extends recent CFD models results. Hence, rotordynamic predictions vary widely. review reveals that engineering practice ignores accurate physical could bridge theory. As energy market shifts toward carbon capture hydrogen compression, knowledge aerodynamic from compressors open impellers will become necessary multi-stage rotors.