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 46 for “"Propulsor"”.
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Analysis of a Goldschmied Propulsor Using Computational Fluid Dynamics Referencing California Polytechnic's Goldschmied Propulsor Testing
<p>The Goldschmied Propulsor is a concept that was introduced in mid 1950's by Fabio Goldschmied. The concept combines boundary layer suction and boundary layer ingestion technologies to reduce drag and increase propulsor efficiency. The most recent testing, done in 1982, left questions concerning …
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An analytical procedure for advanced propulsor design
Thesis (Nav.E.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering; and, (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1999.
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Turbulence Interaction in a Highly Sataggered Cascade-Propulsor Configuration
… flow field through a highly staggered cascade propulsor configuration in the Virginia Tech cascade wind tunnel have been taken. Predictions of the same flow using Rapid Distortion Theory (RDT) were performed. Measurements and predictions were compared. The comparison was oriented to check the …
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Design of a model propulsor for a boundary layer ingesting aircraft
… (BLI). The electrically powered single-stage propulsors represent the ultra-high bypass ratio turbofan engines on a full-scale conceptual aircraft previously designed at MIT. Powered models will use these propulsors in both podded and boundary layer ingesting configurations to allow …
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Active control of underwater propulsor noise using polypyrrole conducting polymer actuators
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2003.
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Advances in ducted propulsor analysis using vortex-lattice lifting-surface techniques
Thesis (Nav. E.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1997.
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Evaluation of propulsor aerodynamic performance for powered aircraft wind tunnel experiments
… to convert electrical power measurements to propulsor mechanical ow power for a 1:11-scale, powered wind tunnel model of an advanced civil aircraft utilizing boundary layer ingestion (BLI); mechanical ow power is a surrogate for aircraft fuel burn. Back-to-back experiments of BLI and non-BLI …
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Steady and unsteady dynamics of an azimuthing podded propulsor related to vehicle maneuvering
While the implementation of azimuthing propulsors powered by internal electric motors (often called "podded propulsors") into the commercial ship market has been swift, the understanding of their hydrodynamics through research, particularly in the area of maneuvering performance, has been very …
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Hydrodynamic Design of Highly Loaded Torque-neutral Ducted Propulsor for Autonomous Underwater Vehicles
The design method for marine propulsor (propeller/stator) is presented for an autonomous underwater vehicle (AUV) that operates at a very high loading condition. The design method is applied to Virginia Tech Dragon AUV. It is based on the parametric geometry definition for the propulsor, use of …
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Prediction of propulsor-induced maneuvering forces using a coupled viscous/potential-flow method for integrated propulsors
… on surfaced and underwater vehicles with complex propulsors. The analysis method is developed for general propellers yet has unique applicability to model highly contracting stern flows associated with integrated propulsors. Integrated propulsors exhibit strong coupling of the various blade-rows …
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Topics on conceptual design of the D8 aircraft : fuel burn uncertainty estimate and BLI propulsor loss modeling
… the modeling of Boundary Layer Ingesting (BLI) propulsor losses at a level of fidelity appropriate for turbomachinery conceptual design analysis, i.e. nonaxisymmetric throughflow analysis. Two contributions to such an analysis based on a body force framework are presented in this thesis: a …
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Magnetohydrodynamic Induction Pump Jet Propuslor for Undersea Vehicles
… the design and prototype development of an MHD propulsor for naval applications. This thesis investigates the design of an induction based MHD propulsor for use on submarines. The objective of this work was to optimize the propulsor design such that its electrical efficiency, ηE > ηD, where ηD …
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Analysis of civil aircraft propulsors with boundary layer ingestion
This thesis describes (i) guidelines for propulsor sizing, and (ii) strategies for fan turbomachinery conceptual design, for a boundary layer ingesting (BLI) propulsion system for advanced civil transport aircraft. For the former, configuration performance analysis shows BLI yields a reduction in …
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Toward Efficient Bio-Inspired Propulsion: The Effect of Propulsor Shape and Kinematics on System Performance and Efficiency during Bio-inspired Locomotion
Both bird and fish locomotion are thought to be more efficient than the equivalent man-made vehicles driven by propellers/impellers and jet engines. Through studies that decompose the different kinematic and shape effects of these biological systems, we can understand what leads to their high …
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Aerodynamics and Power Balance of Boundary Layer Ingesting Aircraft
… Furthermore, the tight integration between the propulsor and the airframe poses great challenges to design and analysis. The aim of this thesis is to provide the first detailed assessment of the flow field and BLI performance of a novel distributed aft-fuselage BLI aircraft. In particular, the …
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Theoretical and Experimental Investigation of Magneto Hydrodynamic Propulsion for Ocean Vehicles
… a good application would be to design a propulsor which produces very little noise for small underwater vehicles. Results of a preliminary feasibility study on this application are presented in this thesis. An approximate, consistent MHD propulsion theoretical model to assess the …
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Effect of Reynolds Number and Geometry on the Undulatory Hydrodynamics of Tapered Elastic Plates
… leads to the acoustic black hole effect at the propulsor trailing edge which minimizes wave reflection and promotes the development of the traveling waves propagating along the propulsor length. By leveraging the acoustic black hole effect, tapered plates can generate bending patterns that vary …
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High performance path following for marine vehicles using azimuthing podded propulsion
… vessel. Furthermore if the rudder or azimuthing propulsor is aft of the vessel's center of gravity then the system is non-minimum phase; during a turn the ship center initially moves in the direction opposite the turn. For these reasons it is necessary to design a robust maneuvering control …
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Design and cavitation performance of contra-rotating propellers
… engineers. Contra-Rotating propellers (CRP) are propulsor configurations offering higher efficiency compared to conventional single propellers by recovering the rotational energy in the propeller slipstream. The application of this type of propulsive device to modern ships becomes even more …
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Evolucion institucional del municipio brasilero en el sistema gubernamental del pais
… enfocando el grado de autonomia como propulsor de ese desarrollo, un a vez que el a està 1igada a los diferentes perlodos evolutivos que ha enfrentado el municipio, para ocupar su posición dentro del Sistema Gubernamental Brasilero, como uno de los màs autónomos del mundo.
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