Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 24 for “"Distributed Propulsion"”.
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Hybrid Electric Distributed Propulsion for Vertical Takeoff and Landing Aircraft
… Specifically, this research focuses on embedded distributed electric propulsion systems, for which the aerodynamic forces and moments are inextricably linked to power input.</p> <p>This effort begins by characterizing the performance of two similar embedded propulsion systems using computational …
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Performance mechanisms and integration of high-lift distributed propulsion systems
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-03-28 without embargo terms
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Regional Transport Aircraft Design using Turbo Electric Distributed Propulsion (TEDiP) System
… aircraft, two such technologies: turbo-electric propulsion and distributed propulsion, are used in this research. Integration of these two technologies with the airframe leverages the well-known favorable interference between the wing and the tractor propeller wake to provide increased lift …
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The effects of aero-propulsive coupling on aircraft with distributed propulsion systems
… which are present for aircraft equipped with distributed electric propulsion (DEP) systems consisting of over-wing trailing-edge mounted (OWTE) arrays of ducted fans, and to identify the influence of those effects on aircraft dynamics. The first experiment consisted of low-speed wind-tunnel …
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Brushless doubly-fed reluctance machine drive for turbo-electric distributed propulsion systems
Turbo-electric distributed propulsion systems are considered to be a critical enabler for low-carbon emission in the aircraft industry. A brushless doubly-fed reluctance machine (BDFRM) is an attractive option to drive the distributed propeller fans for these megawatt-scale turbo-electric …
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The Multidisciplinary Design Optimization of a Distributed Propulsion Blended-Wing-Body Aircraft
… multidisciplinary design optimization (MDO) of a distributed propulsion blended-wing-body (BWB) aircraft. The BWB is a hybrid shape resembling a flying wing, placing the payload in the inboard sections of the wing. The distributed propulsion concept involves replacing a small number of large …
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A reliability method for the analysis of turboelectric distributed propulsion electrical network architectures
… by NASA; the radically different Turboelectric Distributed Propulsion (TeDP) aircraft was also proposed to meet the long term goals. Such a new aircraft design places a significant additional reliance on the electrical system, requiring architectures that meet specified thrust requirements at a …
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Design Optimization of a Regional Transport Aircraft with Hybrid Electric Distributed Propulsion Systems
… NASA's X-57, is one such concept using distributed electric propulsion (DEP) technology. Although practical implementation of DEP is achievable due to the scale invariance of highly efficient electric motors, the current battery technology restricts its adoption for commercial transport …
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Numerical Studies of Jet-Wing Distributed Propulsion and a Simplified Noise Metric Method
… and aircraft. This concept is the jet-wing distributed propulsion idea, which redistributes the thrust across the span of the wings. Distributed propulsion is accomplished by using many smaller engines spread across the wings or several large engines to duct the exhaust flow in a jet-wing. …
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Numerical Assessment of the Performance of Jet-Wing Distributed Propulsion on Blended-Wing-Body Aircraft
… typically concentrated right behind the engine. Distributed propulsion is the idea of redistributing the thrust across most, or all, of the wingspan of an aircraft. This can be accomplished by using several large engines and using a duct to spread out the exhaust flow to form a jet-wing or by …
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Multidisciplinary Design Optimization of Low-Noise Transport Aircraft
… to a conventional transport aircraft. A BWB with distributed propulsion was selected as the configuration for the implicit low-noise design in this research. An MDO framework previously developed at the MAD Center at Virginia Tech has been refined to give more accurate and realistic aircraft …
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Scaling considerations for small aircraft engines
… the aerodynamic benefits of commoditized and distributed propulsion. Improvements in the performance of small engines have, however, prompted another look at this old concept. This thesis examines aspects of aircraft engines that may have application to commodity thrust or distributed …
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Propulsion system concepts for silent aircraft
… to achieve a step change in airframe and propulsion system noise reduction (30 EPNdB). This thesis addresses the assessment of low-noise propulsion system concepts suggested to enable such a functionally-silent aircraft. The propulsion system concepts of ultra-high bypass ratio turbofan …
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A Conceptual Design Methodology for Predicting the Aerodynamics of Upper Surface Blowing on Airfoils and Wings
… conceptual and preliminary design of USB or USB/distributed propulsion aircraft. The focus of the current work is to provide such a methodology for conceptual design of USB aircraft. Based on limited experimental data, the new methodology is shown to compare well with wind tunnel data. In this …
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AC loss in MgB2-based fully superconducting electric machines
… such as offshore wind generation, turbo-electric distributed propulsion in aircraft, and ship propulsion. Superconductors exhibit zero loss in dc conditions, though ac current produces considerable loss due to hysteresis, eddy currents, and coupling. For this reason, many present designs for such …
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A Requirements analysis methodology for turboelectric aircraft
… for commercial-sized aircraft. Turboelectric propulsion enables novel airframe configurations, boundary layer ingestion, and distributed propulsion, each of which can reduce the amount of power and energy wasted during aircraft travel. In addition, it could reduce the aircraft noise. However, …
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Design and acoustic shielding prediction of hybrid wing-body aircraft
… podded engines, and the N2B aircraft with a distributed propulsion system embedded in the airframe. The initial performance assessment shows that the N2A and the N2B aircraft can both meet the N+2 fuel burn goal and that the N2A aircraft is 5.7 EPNdB short of the noise goal. Also, the …
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Investigating Forward Flight Multirotor Wind Tunnel Testing in a 3-By 4-Foot Wind Tunnel
… important with the rapid progress in advanced distributed propulsion VTOL concepts. Much of this experimentation is being performed in large, highly advanced tunnels. However, the proliferation of this class of vehicles extends to small aircraft used by small businesses, universities, and …
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Advances in Aero-Propulsive Modeling for Fixed-Wing and eVTOL Aircraft Using Experimental Data
… develop modeling strategies for transitioning, distributed propulsion, eVTOL aircraft. Novel wind-tunnel experiment designs and aero-propulsive modeling approaches are developed using a subscale, tandem tilt-wing, eVTOL aircraft, leveraging design of experiments and response surface methodology …
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Hybrid wing-body aircraft noise and performance assessment
… podded engines, and the N2B, using an embedded propulsion system. Preliminary FAR Part 36 noise certification assessments are completed using the NASA Aircraft Noise Prediction Program (ANOPP). The limitations of applying current ANOPP noise prediction methods to hybrid wing-body aircraft are …
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