Modal Characterization, Strain Gauge Setup and 1-Way FSI of a Low Pressure Turbine Rotor Blading Available to Purchase

New designs of low pressure turbines show optimized geometries of stator and rotor blading as well as reduced axial spacing between stator and rotor due to the main target of saving weight which is directly related to the fuel consumption of the aero engine. An important step during the realization process is to investigate altered excitation mechanism. For this purpose aero elastic investigations will be performed at the test rig of Graz University of Technology. In general for a serious prediction of vibration characteristics under operating conditions of any structure a detailed knowledge of the dynamic behavior is essential. In preparation of upcoming strain gauge vibration measurements in combination with a telemetry system of the low pressure turbine rotor blading, modal characteristics as well as a realistic estimation of blade deformation are mandatory. Within this paper different methods of evaluating modal characteristic numerical as well as experimental such as impact hammer and shaker tests, respectively are presented. Numerical investigations show different models and mathematical contact formulation and should provide a better understanding for using correct contact models additionally. When comparing numerical with experimental results a prediction of an optimal strain gauge setup for vibration measurements as well as a simplified numerical model for further aero elastic investigations, such as fluid structure interaction analysis (FSI), complete previous investigations. In order to set up the telemetry system the knowledge of blade deformation at operating conditions is of particular importance. Therefore finally in this paper a 1-way FSI coupling is presented.