Using PERMAS for Modal Analyses of High-Pressure Turbine Blades Made of a Single-Crystal Nickel-Based Superalloy

Kurzfassung

High-pressure turbines are located downstream of the combustion chamber and are subject to a high thermal load. The CFD solver TRACE is used to calculate the flow which is in contact with the turbine components. By the multidisciplinary software platform Flow Simulator, TRACE and PERMAS are coupled so that the loads of the CFD mesh can be transferred to the PERMAS mesh in order to calculate the behavior of the structure. Especially the stiffness of the turbine materials, the single-crystal nickel-based superalloys CMSX-4 and CMSX-10, depend strongly on the temperature. The PERMAS load steps consist of a thermal analysis as well as a subsequent nonlinear static and modal analysis. In addition to the temperature dependency, the orthotropic material properties are taken into account. The effect of the thermal and mechanical loads on the eigenfrequencies of the high-pressure turbine blades is shown.