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 316 for “"Stator"”.
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Effects of stator pressure field on upstream rotor performance
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1996.
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Wake Filling Techniques for Reducing Rotor-Stator Interaction Noise
… deficit in a rotor wake and thus attenuate rotor-stator interaction noise. A secondary concern of the project was to reduce the amount of blowing required air for wake filling and thus limit the efficiency penalty in an aircraft engine environment. Testing was performed in a linear blow down …
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Double-frequency stator core vibration in large two-pole turbogenerators
… with load and excitation of double-frequency stator core vibration in large two-pole turbogenerators. The model has a dual purpose, serving first to investigate causes of this effect; secondly to provide predictions suitable for an on-line monitoring scheme.<br/><br/>Electromagnetic forces at …
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Design of a non-axisymmetric stator for improved propeller performance
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering and Dept. of Mechanical Engineering, 1987.
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Harmonic control of multiple-stator induction machines for voltage regulation
… of electrically-isolated, magnetically-coupled stator winding circuits are described. A voltage inverter is developed and used to drive one set of the machine stator winding circuits. The second set of machine stator winding circuits is connected to a three-phase rectifier in which a path for …
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Stator loading measurements behind a fan with trailing edge blowing
The effects of trailing edge blowing on stator unsteady loading were investigated through a set of experiments on a trailing edge blowing fan. Flow field measurements and stator unsteady loading measurements were taken at five radial locations. Reductions in the relative wake harmonics were seen at …
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Turbofan rotor/stator interaction noise reduction through trailing edge blowing
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1998.
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Reduction of Unsteady Rotor-Stator Interaction Using Trailing Edge Blowing
… adding mass flow at the trailing edges of four stators upstream of an aircraft engine simulator. By using trailing edge blowing to minimize the shed wakes of the stators, the flow into the rotor was made more uniform. In these experiments a reduced number of stators (four) was used in a 1/14 …
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Flow patterns and energy dissipation rates in batch rotor-stator mixers
… of energy dissipation rate in a batch rotor-stator mixer fitted with disintegrating head have been numerically investigated. Standard k-e turbulence model in conjunction with sliding mesh method was employed and the simulation results were verified by laser Doppler anemometry (LDA) …
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Testbed development and experimental validation of a high-power slotless stator
… demonstrates that it is possible to build a stator appropriate for this application. The results closely match the FEA analysis and increase confidence that the final motor will be capable of meeting the design requirements. The results also highlight the importance of tight manufacturing …
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Doubly-Salient Permanent Magnet Flux-Reversal-Free-Stator Switched Reluctance Machines
… the drawbacks of conventional flux-reversal-free-stator SRMs and conventional DSPMs is also described. Conventional doubly salient permanent magnet machines which are driven by alternating currents, do not use reluctance torque and have flux reversals in the stator iron. Homopolar flux at the peak …
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Friend or foe? The arrival of Stator limbatus (Bruchidae) in South Africa
Stator limbatus is a generalist seed-feeding beetle (Coleoptera: Bruchidae) whose natural range extends from the southern USA to Latin America. Individuals have recently been collected in the Western Cape province of South Africa in seeds of the invasive alien plant species Acacia mearnsii and A. …
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On the Use of Surface Porosity to Reduce Wake-Stator Interaction Noise
… effects of transient phenomena, such as rotor-stator and rotor-strut interactions, linked to noise and fatigue failure in turbomachinery environments. A computational study was designed to assess the potential of Passive Porosity Technology as a mechanism for alleviating interaction effects and …
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Experimental Investigation of Flow Control Techniques To Reduce Hydroacoustic Rotor-Stator Interaction Noise
… active flow control techniques to reduce rotor-stator interaction noise sources. Two of the three flow control configurations applied to the flow involved the application of active flow control to the leading edge of a single exit guide vane (EGV) mounted downstream of a seven-bladed rotor. The …
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A Computational Study of Axial Compressor Rotor Casing Treatments and Stator Land Seals
… and efficiency, rotor casing treatments and stator land seals.ADPAC and Fluent CFD solvers were used in the analysis of circumferential groove casing treatments and two types of stator seals, one typical of a front stage stator and one typical of a rear stage stator. The computational …
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New structure of dual stator hybrid excitation flux switching motor for aircraft applications
… conventional systems. However, FSMs with single stator associated with limited free space for active sources in stator, which leads to some drawbacks of complicated structure, less paths for flux flow, flux cancellations, and heat generation effects. To overcome these issues, FSMs using double …
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Numerical simulation of unsteady rotor/stator interaction and application to propeller/rudder combination
… developed in order to simulate unsteady rotor/stator interaction, and to predict the unsteady performance of a propeller and its rudder. The method is first developed and tested in two-dimensions by using a boundary element method in which a front hydrofoil is moving downward, while a back …
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Aerodynamic Performance of a Flow Controlled Compressor Stator Using an Imbedded Ejector Pump
A high-turning compressor stator with a unique flow control design was developed and tested. Both boundary layer suction and trailing edge blowing developed from a single supplied motive pressure source are employed on the stator. Massflow removed through boundary layer suction is added to the …
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