The first configuration features propellers that are mounted to the horizontal tailplane. Finally, two detailed studies on aircraft level demonstrate the relative importance and the coupling between aerodynamic interactions. Second, a configuration study indicates the expected trends on various performance indicators. First, fundamental phenomena are investigated which provide insight for related configurations and derivatives thereof. To this end, three different types of analyses are performed. The objective of this dissertation is: to characterize the role of the aerodynamic interaction between the propeller and the airframe on the performance and static stability characteristics for selected aircraft configurations which aim for a beneficial propeller-airframe interaction. The closer proximity of the propeller and airframe requires a more dedicated integral design (approach) of both the airframe and propulsion unit. Furthermore, by employing the aerodynamic interaction in specific phases of the flight, beneficial propulsion integration can also enable the use of alternative energy sources and increase the electrification level of the propulsion system. The objectives of unconventional propeller installations include the enhancement of the airframe aerodynamic efficiency, increasing the propeller efficiency, improving cabin comfort, and improving the overall aircraft design by lower operating empty weight. It is envisioned that the future generations of regional and short to medium-range aircraft employ a high level of propeller integration to achieve low-emission flight. Furthermore, the synthesis and successful test of a computationally efficient aeroelastic optimizationįramework using the harmonic-balance method is also presented and discussed. The results reported in part II of this thesis show that a CAD-based blade parametrization approach increases the robustness of adjoint-based optimization methods. Besides, it also highlights that the symmetric configuration of supersonic vanes provides superior o�-design performance in comparison to the asymmetric configuration. One outcome of this research, described in part I of this dissertation, is a novel supersonic vane design method which generates geometries with higher fluid-dynamic performance and flow uniformity if compared to those obtained from computationally expensive fluid dynamics optimization methods. Specifically, a supersonic vane design method in part I and an adjoint-based optimization framework in part II. Turbomachines affected by strong non-uniform flows. This dissertation presents research on two automated CFD-based design methods for To overcome these shortcomings, two strategies can be adopted: first, the non-uniform loading of the blades must be reduced and, second, the mechanical structure must be made optimally strong to withstand these loads without other detrimental effects. For these machines, not only the fluid dynamic effciency can be unsatisfactory, but they also suffer from poor structural performance. Unconventional turbomachines which can greatly benefit from such methodological advancements are those whose performance is penalized by inherently non-uniform flows, like, for example, supersonic turbines and boundary-layer-ingestion fans. These methods lay the foundation stone for a more holistic multi-disciplinary design of The quick and optimum realization of the needed unconventional turbomachines. These methods will increasingly allow for Turbomachinery applications are now available. Thanks to the recent advancements in numerical methods and availability of high-performance computational resources, advanced automated design methods tailored to Hence, novel and disruptive design methods are pivotal to achieve a paradigm shift in turbomachinery performance across all energy technology platforms. operation under highly non-uniform flow or with novel fluids, make the available design methods insuffciently capable of providing effcient designs. However, the specific requirements of these turbines and compressors, e.g. Key enablers of conventional and future renewable energy conversion technologies are turbomachines. The urgent need to transition to a climate-neutral society requires rapid developmentĪnd adoption of renewable technologies.
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