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 294 for “"propeller"”.
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An enhanced propeller design program based on propeller vortex lattice lifting line theory
A suite of propeller numerical design tools was developed in MATLAB®, a high-level technical computing language. The tools were based on the FORTRAN programs developed by Professor Justin Kerwin at MIT in 2001 and include enhanced parametric design capability, Graphical User Interfaces (GUIs) and …
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Calculation of cavitating propeller characteristics
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Naval Architecture and Marine Engineering, 1951.
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Marine propeller blade tip flows
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1982.
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Periodic propeller forces in unsteady flow
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Naval Architecture and Marine Engineering, 1964.
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Propeller based human powered swimming device
… a squatting motion to drive counter rotating propellers up and down a threaded shaft creating the propulsion force to move the swimmer forward. The design of this device is primarily geared towards scuba divers and swimmers moving beneath the water surface. Through various tests we were able …
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Using Single Propeller Performance Data to Predict Counter-Rotating Propeller Performance for a High Speed Autonomous Underwater Vehicle
The use of counter-rotating propellers is often desirable for aerospace and ocean engineering applications. Counter-rotating propellers offer higher peak efficiencies, better off-design performance, and roll control capabilities. But counter-rotating propeller matching is a difficult and complex …
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Exploratory experimental investigation of a wave propeller
… determine if a small secondary airfoil or wave propeller, oscillating in a rotary plunging motion, could significantly affect the airflow over a lifting airfoil surface to delay the onset of stall. The lifting airfoil shape was a NACA 66(215)-216, chosen for its chordwise pressure port …
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Theoretical prediction of counter-rotating propeller noise
… the tone noise generated by a counter-rotation propeller. We start by deriving formulae for the harmonic components of the far acoustic field generated by the thickness and steady loading noise sources. Excellent agreement is shown between theory and measurements. Asymptotic approximation …
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Interactive Optimization Programs for Initial Propeller Design
… thesis presents two methods for initial design propeller optimization using constrained non- linear programming. The process uses the Nelder-Mead simplex algorithm. The Wageningen B-series optimal propeller selection is presented along with the combined annular momentum theory and blade element …
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Aerodynamics of lifting surfaces in propeller slipstreams
The high-speed flow in the wake of the propeller also known as propeller wash, or simply propwash, can severely affect the aerodynamic forces on a lifting surface. Steady-state computational results for a symmetric SD8020 airfoil with chord length of 1 ft in a propeller slipstream at a freestream …
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Hub effects in propeller design and analysis
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1985.
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Analysis and experiments for contra-rotating propeller
Contra-rotating propellers have renewed interest from the naval architecture community, because of the recent development of electric propulsion drives and podded propulsors. Contrarotating propulsion systems have the hydrodynamic advantages of recovering part of the slipstream rotational energy …
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Unsteady propeller hydrodynamics by Dirk H. Renick.
… the ability to quantitatively predict unsteady propeller forces for modern, multi-blade row, ducted propulsors operating in highly contracting flowfields. Current algorithms provide valuable insight into qualitative trendlines for these modern designs. This thesis has focused on the more …
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Propeller performance analysis using lifting line theory
Propellers are typically optimized to provide the maximum thrust for the minimum torque at a specific number of revolutions per minute (RPM) at a particular ship speed. This process allows ships to efficiently travel at their design speed. However, it is useful to know how the propeller performs …
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Design and construction of a propeller open water testing apparatus and testing of a stereolithography 3D printed model propeller
… describes the design and construction of a propeller open water testing apparatus for educational and experimental use at MIT. This test apparatus was built as an inexpensive alternative to conducted in-house model scale marine propeller testing. A complimentary study was conducted to …
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Accuracy investigations of Parshall flumes and propeller meters
… flumes. Tests were performed at effluent propeller meters to determine their accuracy. Hydraulic improvements are suggested for reduction of both flow disturbances and measurement errors.
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Post stall propeller behavior at low Reynolds numbers
Limited data exists for propeller and wind turbine post stall aerodynamics. Post stall aerodynamics was observed in small propellers at low Reynolds numbers. First, performance data (thrust, power, and efficiency) of set variable pitch propellers was acquired in a wind tunnel. The propellers were 6 …
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Prediction of Noise Associated with an Isolated UAV Propeller
… analysis of the noise generation mechanism of a propeller as a mode of propulsion of the said aerial vehicles. Numerical simulation utilizing a Hybrid Large-Eddy Simulation (LES) coupled with Unsteady Reynolds-Averaged Navier-Stokes (RANS) solver, is adopted on an isolated propeller modeled from …
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Feasibility Study of an Axially-Stacked, Subsonic Propeller System
… motor-powered UAV may become dominated by the propeller’s acoustics. In many cases, this propeller is selected off-the-shelf and only given consideration late in the design process. In an effort to reduce acoustic emission of future UAVs, this thesis explores a unique multi-stage propeller …
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