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The gas turbine technology has already reached a high level of development and maturation. Further improvement requires a better understanding of the individual components and the effects of implementing new technology. For this purpose, the German Aerospace Center (DLR) operates a turbine test facility, called Next Generation Turbine Test Facility (NG-Turb). The NG-Turb comprises of a two shaft configuration with up to 2:8MW total shaft power to allow investigations on high-, intermediate- or low-pressure turbines. The test facility works in a closed loop cycle with dried air as working fluid. This cycle is driven by a four stage radial compressor with pre-, inter- and post-cooler. Numerous test bench control variables enable a largely independent setting of Mach and Reynolds number at the turbine rig. For the optimization of the operational performance and the assessment of cycle modifications a virtualization of the test facility is required. Therefore, a model based engineering approach was established and digital representations of the thermodynamic behaviour for the main components were developed. To perform test facility simulation a thermodynamic synthesis of the components was evolved. This implies a procedure for the correct setting of control variables and an numerical setup to ensure a realistic interaction of the component models. With that digital representation predictions of operating states and feasible operating conditions with respect to test bench constraints, like pipe temperatures, compressor power and shaft speeds, can be conducted. First studies with this digital system have shown that the convergence of the compressor unit represents a challenging task. Therefore, a reduced thermodynamic model was set up to improve the simulation stability and the understanding of the multi-stage compressor behaviour. With knowledge gained, an approach was developed that allows the simulation of demanded turbine operating points. Finally, a successful validation of the compressor unit was carried out by using data from manufacture simulations and commissioning measurements. As an use case, different test facility adaptations were simulated to reach a defined temperature and pressure combination at turbine test rig inlet. The simulation results led to a successfully adaption of the test bench, the extension of the compressor spool speed range.
Deutscher Luft- und Raumfahrtkongress 2020
Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn, 2020
21,0 x 29,7 cm, 12 Seiten
Stichworte zum Inhalt:
Thermodynamic Simulation, Performance Prediction, Test Bench Simulation, NG-Turb, Next Generation Turbine Test Facility, Transition, CleanSky2, GTlab, Virtualization, Digitalization
Schneider, B. (2020): Virtualization of the DLR Turbine Test Facility NG-Turb. Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V.. (Text). https://doi.org/10.25967/530132. urn:nbn:de:101:1-2020120413292324685721.