NUMERICAL ANALYSIS OF 3D VISCOUS FLOW THROUGH MULTISTAGE TURBOMACHINES AT SMALL FLOW RATE

Parametric Polynomial Method is used to analyze the three dimensional viscous flow through multistage turbomachines. Three high pressure stages in a 20MW steam turbine are calculated at design flow rate and small llow rate (G/G0 = 0.3). Large separated flow is predicted in the passage at small flow rate. The result shows that the upstream flow has a conspicuous effect on the downstream flow, so the multbetage fiow calculating is necessary