The client required that turbine mass flow had to be fixed for different operating conditions (ER, T01, RPM). Therefore, the nozzle setting angles for any new design had to be varied several times to match the target mass flow for the different operating conditions. An automatic CFD and FEA workflow which integrates 3D Inverse Design code TURBOdesign1 with Ansys Workbench, including CFX and Mechanical, has been developed as shown in Figs. 1 and 2. The nozzle blade geometry can be rotated automatically to meet the mass flow specifications using only four CFD calculations.
The nozzle and rotor blades are parameterized using meridional, blade loading, thickness and stacking parameters. In the first step, ADT ran a DoE with linear approximation composed of 30 design cases and varying the initial set of 22 design parameters. The first DoE was used to provide initial sensitivities values for the various design input parameters and select the most relevant ones for the selected performance parameters.