Russo, Lorenzo (2020) Identification of Aerodynamic Force Sources for Next Generation Aircraft. [Tesi di dottorato]


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Item Type: Tesi di dottorato
Lingua: English
Title: Identification of Aerodynamic Force Sources for Next Generation Aircraft
Date: 4 March 2020
Number of Pages: 155
Institution: Università degli Studi di Napoli Federico II
Department: Ingegneria Industriale
Dottorato: Ingegneria industriale
Ciclo di dottorato: 32
Coordinatore del Corso di dottorato:
Tognaccini, RenatoUNSPECIFIED
Date: 4 March 2020
Number of Pages: 155
Uncontrolled Keywords: Aerodynamics, CFD, drag breakdown, thrust-drag bookkeeping
Settori scientifico-disciplinari del MIUR: Area 09 - Ingegneria industriale e dell'informazione > ING-IND/06 - Fluidodinamica
Date Deposited: 02 Apr 2020 07:52
Last Modified: 10 Nov 2021 14:33


Hot topic of modern Aerodynamics is the analysis of the aerodynamic force. Indeed, the growth in global air traffic passenger demand together with the ever more stringent regulations on environmental impact of commercial flight pushed the designers to advanced aircraft configurations. The link between the flow structures and aerodynamic force generation became a fundamental point for the design of the next generation aircraft ; just think of the joined-wing airplanes, which mount staggered interconnected non-planar wings, or the boundary-layer ingestion architectures, based on a strong integration of aerodynamic surfaces and propulsion systems. The aerodynamic analysis of these unconventional configurations revealed the necessity to deepen the understanding of new flow phenomena and their connection with the aerodynamic force. In the last decades, a big jump forward has been taken thanks to the high-technological advances introduced in both Experimental Fluid Dynamics (EFD) and Computational Fluid Dynamics (CFD); they allowed aerodynamicists to have a profound insight in the flow-field features and develop unconventional techniques for the analysis of the aerodynamic force: the far field methods. These methods directly rely on the phenomena occurring in the flow and permit the decomposition of the aerodynamic drag in viscous, wave and lift-induced contributions, the ones which the aeronautical designers are interested in. In the present dissertation a recently proposed unconventional method for the analysis and the breakdown of the aerodynamic force, based on the vortex force theory, is studied and new developments are introduced. The vortical method will be compared with the more assessed thermodynamic methods stressing the link between the different drag definitions. The connection of the vortex force with the reversible flow phenomena will be definitively proven also in the compressible regime and a vortical method will be provided for dealing with the thrust computation in case of actuator disk. Finally, two drag breakdown analyses will be proposed. An innovative turboprop wing-body configuration, mounting natural laminar flow and riblets drag reduction systems, will be analyzed with a standard thermodynamic method to compute the impact of each technology on the overall aerodynamic performance. In addition, a simple Box Wing configuration will be analyzed by the innovative vortical method for investigating if the compressibility effects degrade its low induced drag feature, that was showed only in inviscid incompressible flow so far. The applications proposed have to be intended as a proof of the strong impact that the far field aerodynamic force analysis may have in the aerodynamic design of the next-future airplanes.


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