In this report the performance scatter of a turbine used in the turbo pump for PROMETHEUS has been analyzed. The study is split in two phases:

• First only the rotor has been modified in dimensions;

• Lastly both stator and rotor have been modified together.

In the first case, Numeca Autogrid 12.1 has been used for quickly produce meshes of the different configurations of the rotor that are matched always with a nominal stator. After that, 3D CFD simulations have been run using Ansys CFX 19.1, for a total of nine cases combining together the rotor’s geometry deviations.For the second phase, the method of mesh deformation has been used in order to obtain the geometry variations needed for both stator and rotor. The stator has been transformed in the nozzle throat and outlet sections, the rotor has been varied in the same manner as per the first phase with the difference that only the blade thickness has been displaced using the mesh deformation method, taking advance of the work done in phase one for hub and shroud deviations.The advantage of using mesh deformation instead of variations using CAD tool, is that this method is built-in in Ansys CFX 19.1 and allows the aerodynamic designers to be more autonomous from the CAD designers.The results are then post processed and several tables are provided as output for comparing them later on and evaluate the changes computed. As a last step, all the results are collected and run into optiSLang in order to compute a sensitivity analysis, so that it is possible to evaluate what is the most influent input parameter for each output.