To ensure the quality standards in engine testing, a growing research effort is put into the modeling of full engine test cell systems. A detailed understanding of the performance of the combined system, engine and test cell, is necessary e.g. to assess test cell modifications or to identify the influence of test cell installation effects on engine performance. This study aims to give solutions on how such a combined engine and test cell system can be effectively modeled and validated in the light of maximized test cell observability with minimum instrumentation and computational requirements. An aero-thermodynamic performance model and a CFD model are created for the Fan-Engine Pass-Off Test Facility at MTU Maintenance Berlin-Brandenburg GmbH, representing a W-shape configuration, indoor Fan-Engine test cell. Both models are adjusted and validated against each other and against test cell instrumentation. A fast-computing performance model is delivering global parameters, whereas a highly-detailed aerodynamic simulation is established for modeling component characteristics. A multi-disciplinary synthesis of both approaches can be used to optimize each of the specific models by calibration, optimized boundary conditions etc. This will result in optimized models, which, in combination, can be used to assess the respective design and operational requirements.
A possible propulsion system concept for a stratospheric multi-body airship has been investigated. It features distributed propulsion to fulfill thrust and stabilization demands of the airship. In the frame of this research a simulation model for the propulsion system has been developed in Matlab/Simulink. The propulsion system’s main components are propellers, which are driven by electro motors, back-up batteries and gas turbine power plants to supply the necessary electric energy. All components have been adapted to work in ambient conditions at an altitude of 20km. The investigations have demonstrated adequate system dynamics and confirmed the sizing of power plants and back-up batteries. The control system has shown adequate stability and, therefore, guarantees the provision of the demanded thrusts and powers.
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