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Dissertations / Theses on the topic 'Rotor and stator losses'

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Published: 3 June 2025
Last updated: 31 July 2025

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1

Langford, Matthew David. "Experimental Investigation of the Effects of a Passing Shock on Compressor Stator Flow." Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/32020.

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A stator cascade was developed to simulate the flow conditions within a close-stage-spacing transonic axial compressor. Experiments were conducted in a linear transonic blowdown cascade wind tunnel with an inlet Mach number of 0.65. The bow shock from the downstream rotor was simulated by a single moving normal shock generated with a shock tube. First, steady pressure data were gathered to ensure that the stator cascade operated properly without the presence of the shock. Next, the effects of the passing shock on the stator flow field were investigated using shadowgraph photography and Dig
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2

Kuda, Roman. "Zlepšení energetických parametrů asynchronních strojů malého výkonu." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219185.

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This master´s thesis treats of all asynchronous motor. The project is about type and distribution motors, about differences between three-phase and single-phase machines and efficiency. In one of the chapters describes a particular type of engine with all the parametersfrom the manufacturer. This engine is completely analyzed and it is measured in detail. Then the project deals with the division, the calculation of losses and subsequent possibilities to increase the efficiency of induction motor. In the last chapter is calculation of single-phase motors, based on the engine produced.
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3

Chitroju, Rathna. "Improved performance characteristics of induction machines with non-skewed symmetrical rotor slots." Licentiate thesis, KTH, School of Electrical Engineering (EES), 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-11510.

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<p>Induction machines convert more than 55% of electrical energy into various other forms in industrial and domestic environments. Improved performance, especially by reduction of losses in induction machines hence can significantly reduce consumption of electricity. Many design and control methods are adopted to make induction machines work more efficiently, however certain design compromises are inevitable, such as skewing the rotor to improve the magnetic noise and torque characteristics increase the cross current losses considerably in a cage rotor, degrading the efficiency of the motor. C
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4

Vinkler, Stanislav. "Zvyšování účinnosti třífázových asynchronních motorů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-220923.

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This work is dedicated to increasing the effectiveness of a particular draft induction motor, which was before the change and subjected to laboratory measurements according to EN60034 - 2-1, an analytical calculation of the losses and the overall efficiency and analysis program RMxprt. The first part focuses on the analysis of measurement data, measurement of partial loss in the machine and overall efficiency. In the second chapter, losses and efficiency calculated analytically, in the first case using the links in the professional literature dealing with the design of electric motors and in t
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5

Lloyd, Adrian Edmund Dominic. "Rotor stator interaction noise." Thesis, University of Cambridge, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.611782.

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6

Sparks, T. "Fluid mixing in rotor/stator mixers." Thesis, Cranfield University, 1996. http://dspace.lib.cranfield.ac.uk/handle/1826/3307.

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An industrial rotor-stator mixer was fitted into a flow loop to carry out overall power balance, flow visualisation and residence time distribution experiments. These were performed on various rotor-stator geometries and a half-scale unit. The overall power measurements showed that a large amount of power was given to the fluid by the rotor and estimates of the local turbulent energy dissipation rate per unit mass, e, were made using these data. It was found that the pumping efficiency of rotor-stator mixers is 10 to 20% and an expression for the motor power (when the flow rate is controlled)
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7

Fernando, Bothalage D. R. "Fluid dynamics of rotor-stator cavities." Thesis, University of Leicester, 2018. http://hdl.handle.net/2381/43057.

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This investigation is of mass, momentum and heat transfer applications of the idealised rotor-stator cavities using Computational Fluid Dynamics (CFD). This approach is based on previous literature that provides a fundamental view of the subject. However, this research is more focused on the development and simulation of high-fidelity computational models to refine the understanding of rotor-stator flow problems in engineering. An open source CFD toolbox, OpenFOAM, is used to solve Navier-Stokes equations and turbulence is modelled using Large eddy simulation (LES) approaches. The rotor bounda
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8

Janáček, Martin. "Energetické parametry jednofázových asynchronních motorů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2016. http://www.nusl.cz/ntk/nusl-242197.

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The master's thesis deals and introduces a single-phase inductions machines, the principle of operation, types of design and operating conditions. This thesis includes analysis of individual losses in the machine and reduce the possibility of different ways. After a theoretical proposal for reducing losses are measured by mass-produced single-phase induction machine. Further machine modifications proposed for reducing losses in the stator windings and designed a prototype machine with the adjustment of the magnetic circuit to reduce iron losses made by ATAS elektromotory Nachod a.s. The result
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9

Sousa, Alves Joao. "Experimental and CFD Analysis of a Biplane Wells Turbine for Wave Energy Harnessing." Thesis, KTH, Mekanik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-124070.

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Several alternative ways of producing energy came up as the world took conscience of the finite availability of fossil fuels and the environmental consequences of its use and processing. Wave and tidal energy are among the so called green energies. Wave energy converters have been under research for the past two decades and yet there hasn’t been one technology that gathered everyone’s acceptance as being the most suitable one. The present work is focused on a self-rectifying turbine for wave energy harnessing. It’s a self-rectifying biplane Wells with an intermediate stator. The main goal is t
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10

Gurak, Derya. "Numerical Investigation Of Rotor Wake-stator Interaction." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12605434/index.pdf.

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iv In this thesis, numerical solutions of a 2D stator compressor cascade at a given inlet Mach number (0.7) and four values of incidence (49&deg<br>, 51&deg<br>, 53&deg<br>and 55&deg<br>) are obtained. Reynolds averaged, thin layer, compressible Navier Stokes equations are solved. Different grid types have been generated. Finite differencing approach and LU - ADI splitting technique are used. Three block parallel Euler and Navier Stokes solutions are compared with the experimental results. Baldwin-Lomax turbulence model is used in the turbulent predictions and boundary layer comparisons and nu
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11

SEGAYER, AHMED MOHAMMED. "ROTOR STATOR CONTACT IN A ROTATING MACHINE." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2000. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=34202@1.

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COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>O crescente avanço da tecnologia de equipamentos rotativos tem exigido dos projetistas de máquinas adapta-los às condições de operação mais rigorosas e, consequentemente, projetos mais sofisticados. O aumento da eficiência é frequentemente realizado por operações de minimização de folga entre os elementos rotativos e estacionários e/ou aumento da velocidade de rotação do rotor. A natureza das funções e o custo elevado dos equipamentos rotativos de alta velocidade exigem precisão e segurança no projeto para evitar riscos de operaçã
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12

VINTELER, DANIEL. "Interaction rotor/stator dans les turbomachines axiales." Paris 6, 1996. http://www.theses.fr/1996PA066433.

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L'impact de l'interaction rotor/stator sur les performances, la fiabilite et la duree de vie des turbomachines est loin d'etre negligeable. Afin de quantifier l'amplitude des phenomenes physiques intervenant dans l'ecoulement, nous avons etudie l'interaction rotor/stator par resolution numerique des equations d'euler tridimensionnelles. Le probleme est aborde a travers trois approches differentes. La premiere consiste a etudier l'ecoulement stationnaire dans un environnement multi-etages. Pour ce cas les rangees d'aubes communiquent via des moyennes circonferentielles, effectuees dans les plan
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13

Jung, Alexander. "Berechnung der Stator-Rotor-Wechselwirkung in Turbomaschinen." [S.l. : s.n.], 2000. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB8862171.

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14

Sadri, Malek Arsalan. "Numerical modelling of rotor/stator interactions in turbomachinery." Thesis, Imperial College London, 1997. http://hdl.handle.net/10044/1/7828.

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15

Coren, Daniel. "Windage due to protrusions in rotor-stator systems." Thesis, University of Sussex, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.444362.

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16

Mear-Stone, Leah Isobel. "Theoretical modelling of flow in rotor-stator systems." Thesis, University of Bath, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.681054.

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The prevention of hot gas ingress between rotating and stationary discs in gas turbines is big business, with experimental and computational research being common in the sector. Experimental rigs, operating at a fraction of the engine size and in simulated fluid dynamic conditions, model the engine environment. Computational Fluid Dynamics (CFD) is used in both academia and industry to model the flow and heat transfer in a turbine. CFD is expensive, time consuming and requires detailed experimental validation. The engine designer has a need for simpler, faster mathematical modelling methods, u
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17

Kiuru, Wille. "Synchronous generator rotor position estimation from stator and rotor terminal currents and voltages." Thesis, KTH, Skolan för elektro- och systemteknik (EES), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-194196.

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This thesis presents an alternative method for measuring the rotor position of a synchronousgenerator, without the use of sensors to measure the rotor position. The method uses thecurrent and voltage measurements on the stator and rotor terminals from the protectionrelays. The rst step is to investigate how the rotor position can be estimated basedon the available measurement data. It was found out that the rotor position couldn'tbe estimated during dynamic state operation, when directly solving it from measurementdata. This is due to the presence of the eld and d-axis damper winding current d
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18

Studer, Martin. "Ablauf schneller Reaktionen in Rotor-Stator-Mischern verschiedener Grösse /." [S.l.] : [s.n.], 1990. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=9037.

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19

Thapar, N. "Liquid-liquid dispersions from in-line rotor-stator mixers." Thesis, Cranfield University, 2004. http://hdl.handle.net/1826/3316.

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Experiments were performed on an industrial scale Silverson in-line rotor-stator mixer to investigate its liquid-liquid dispersion capabilities. A non-coalescing kerosene-water system was used in the tests and the effect of stator geometry, rotor-speeds, flowrates and dispersed phase concentrations on the droplet size distribution was investigated. The rotor-speed and the dispersed phase concentration were found to have the most influence on droplet size. Drop sizes were also seen to increase with an increase in open area. No differences were observed in the droplet sizes or power draw of the
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20

Lewis, Paul. "Pre-swirl rotor-stator systems : flow and heat transfer." Thesis, University of Bath, 2008. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.516951.

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21

Graf, Martin Bowyer. "Effects of stator pressure field on upstream rotor performance." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/10949.

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22

Lesaffre, Nicolas. "Stabilité et analyse non-linéaire du contact rotor-stator." Ecully, Ecole centrale de Lyon, 2007. http://bibli.ec-lyon.fr/exl-doc/nlesaffre.pdf.

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La recherche de rendements toujours plus grands, pousse les constructeurs de turboréacteurs à adopter des configurations où les aubes des parties tournantes sont extrêmement proches du carter en vis-à-vis, augmentant par la même occasion le risque de prise de contact entre le rotor et le stator des moteurs. Ces contacts sont générateurs d'instabilités et de comportements chaotiques provoquant des charges transitoires importantes sur les aubes qui peuvent alors dépasser leur limite d'endurance et conduire à l'endommagement des machines. Il est donc primordial d'identifier et de caractériser les
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23

Minton, Christopher Mills. "Wake Filling Techniques for Reducing Rotor-Stator Interaction Noise." Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/33990.

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Several flow control schemes were designed and tested to determine the most suitable method for reducing the momentum 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 cascade wind tunnel, which produced an inlet Mach number of 0.345. The cascade consisted of five blades with the stagger angle, pitch, and airfoil cross-section representative of 90% spa
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24

Lesaffre, Nicolas Thouverez Fabrice. "Stabilité et analyse non-linéaire du contact rotor-stator." [S.l.] : [s.n.], 2007. http://bibli.ec-lyon.fr/exl-doc/nlesaffre.pdf.

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25

Envia, Edmane. "Influence of vane sweep on rotor-stator interaction noise." Diss., The University of Arizona, 1988. http://hdl.handle.net/10150/184609.

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In this dissertation the influence of vane sweep on rotor-stator interaction noise is investigated. In an analytical approach, the interaction of a convected gust, representing the rotor viscous wake, with a cascade of finite span swept airfoils, representing the stator, is analyzed. The analysis is based on the solution of the exact linearized equations of motion. High-frequency convected gusts for which noise generation is concentrated near the leading edge of the airfoils are considered. In a preliminary study, the problem of an isolated finite span swept airfoil interacting with a convecte
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26

Hayden, Belva J. "Two-dimensional analysis of rotor suction and the impact on rotor-stator interaction noise." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/46439.

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27

Smuda, Christina [Verfasser]. "Numerische und experimentelle Untersuchung eines Rotor-Stator-Mischsystems / Christina Smuda." Aachen : Shaker, 2012. http://d-nb.info/1069045225/34.

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28

Penin, Veronique. "Interactions rotor-stator en turbine : étude de l'effet potentiel remontant." Phd thesis, Ecole Centrale de Lyon, 2011. http://tel.archives-ouvertes.fr/tel-00679727.

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L'écoulement dans les turbomachines est tri-dimensionnel et instationnaire. Actuellement, les concepteurs de moteurs cherchent à réduire l'encombrement et le poids des machines. En conséquence, les interactions entre les roues, appelées interactions rotor-stator, sont renforcées. Parmi elles, l'effet potentiel remontant n'est désormais plus négligeable malgré sa rapide atténuation spatiale. Dans cette étude, cet effet potentiel remontant a été analysé sur une configuration spécialement conçue : une grille linéaire d'aubes de turbine, suivie de barreaux défilants en aval à une distance de 20% d
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29

Roshani, Moghaddam Elham. "Numerical investigation of fluid flow in protruded rotor-stator cavities." Thesis, University of Sussex, 2015. http://sro.sussex.ac.uk/id/eprint/53891/.

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The torque associated with overcoming the losses on a rotating disc is of particular importance to the designers of gas turbine engines. Not only does this represent a reduction in useful work, but it also gives rise to unwanted heating of metal surfaces and the adjacent fluid. This research presents a numerical study on the effect of rotor-mounted bolts on the moment coefficient and flow structure within a rotor–stator cavity under conditions representative of modern gas turbine engine design. Steady-state, two-dimensional and three-dimensional, computational fluid dynamics simulations are ob
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30

Hall, Steven. "Scale-up of emulsification in in-line rotor–stator mixers." Thesis, University of Birmingham, 2013. http://etheses.bham.ac.uk//id/eprint/4045/.

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The power draw and emulsification performance of in-line rotor-stator mixers were investigated experimentally and theoretically, to predict droplet size as a function of process and formulation variables and to establish scale-up rules. The effect of process conditions, three mixer scales and thirteen rotor-stator geometry configurations on emulsification performance were investigated. Emulsions of a wide range of silicone oil viscosities of varying phase volumes, dispersed in aqueous surfactant and non-surfactant solutions were studied. For lab to factory scale in-line rotor-stator mixers, th
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31

Brookfield, John M. (John Milton). "Turbofan rotor/stator interaction noise reduction through trailing edge blowing." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/9934.

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32

Leitch, Thomas A. "Reduction of Unsteady Rotor-Stator Interaction Using Trailing Edge Blowing." Thesis, Virginia Tech, 1997. http://hdl.handle.net/10919/30527.

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An aeroacoustic investigation was performed to assess the effects of 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 scale model inlet which was coupled to a 4.1 in (10.4 cm) turbofan engine simulator with 18 rotors and 26 downstream stators. This study is a preliminary step toward a more in depth investigation of using trailing edge blowing to reduce u
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33

Bardoux, Fabien. "Modélisation des interactions instationnaires rotor-stator en turbomachine multi-étages." Ecully, Ecole centrale de Lyon, 2000. http://www.theses.fr/2000ECDL0009.

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L'écoulement au sein des turbomachines multi-étages est assujetti à des phénomènes instationnaires de natures aléatoires et déterministes. On distingue en effet d'une part la turbulence, représentative du comportement stochastique du fluide, et d'autre part les interactions instationnaires entre les roues aubées, provoquées par la rotation de la machine. Ces interactions impliquent les sillages des aubages, les ondes de choc, et influent sur le blocage aérodynamique ou encore les transferts thermiques. Les interactions entre les rotors et les stators sont caractérisées par des échelles de temp
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34

Guedeney, Thomas. "Modélisation des interactions rotor-stator par une méthode d'équilibrage harmonique." Phd thesis, Ecole Centrale de Lyon, 2012. http://tel.archives-ouvertes.fr/tel-00948101.

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Malgré les progrès faits dans les dernières décennies en CFD, les techniques RANS instationnaires pour les turbomachines multi-étages sont toujours très couteuses en temps de calcul, réduisant leur intérêt en conception industrielle. Grâce à une analyse de Fourier, les équations instationnaires de Navier-Stokes peuvent être considérées comme 2N+1 équations stationnaires couplées par un terme source. Cette approche calcule efficacement les écoulements instationnaires périodiques et montre de forts gains en terme de temps de calcul. Cependant, l'expression du terme source est algébrique, ce qui
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35

Štaffa, Jiří. "Ztráty jednofázového asynchronního motoru s trvale připojeným kondenzátorem." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2015. http://www.nusl.cz/ntk/nusl-221263.

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This project deals with increasing efficiency of one phase induction motor with permanent split capacitor. We can whole thesis divide into two parts, the first one is basic and the second is interested in analysis and measurement. First part handles with construction of single phase induction motor, explanation of function principle, start and run of motor. Calculating of efficiency including type of losses, which reduce efficiency. Second part concerns analysis losses including moment load characteristic, motor measurement while rotor is locked, with no load operation, measuring mechanical an
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36

Pestana, Miguel. "Impact of a heterogeneous stator on the rotor-stator interaction-noise : an analytical, experimental and numerical investigation." Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEC003.

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La présente étude vise à quantifier par une modélisation analytique, des essais et des simulations numériques, l’impact des aubes de stator hétérogènes sur le bruit d’interaction rotor-stator dans les turbomachines axiales. Le travail développé s’appuie sur des premières observations sur un ventilateur axial à basse vitesse à l’École Centrale de Lyon, l’étage LP3. Il a été observé que les deux premières fréquences de passage des pales rayonnaient à des niveaux élevés alors qu’elles devaient être coupées par le conduit selon le critère de Tyler &amp; Sofrin. Une campagne expérimentale est alors
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37

Lippi, Silvio. "Analysis of rotor eddy-current losses in synchronous motors." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2022.

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La stima delle perdite rotoriche per correnti parassite (Eddy currents) è cruciale nella progettazione dei moderni motori SPM. Poichè le loro prestazioni dipendono fortemente da esse. I motori devo essere progettati in modo da prevenire eccessive perdite rotoriche, le quali possono portare alla demagnetizzazione dei magneti e ad un deterioramento delle performance generali della macchina. Nel capitolo 1 sono illustati i principi fisici che descrivono il comportamento dei motori elettrici e delle perdite rotoriche per correnti parassite. Sono poi discusse le proprietà dei materiali impiegati ne
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38

Barbosa, Emerson. "Etude numérique des écoulements tridimensionnels dans des cuves cylindriques rotor-stator." Phd thesis, Université d'Evry-Val d'Essonne, 2002. http://tel.archives-ouvertes.fr/tel-00354646.

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L'écoulement d'un fluide visqueux incompressible dans une cuve cylindrique rotor-stator est étudié. Ces écoulements ont fait l'objet de récents travaux numériques tridimensionnels pour des rapports d'aspect h>1,75. On propose une étude numérique de la rupture de l'axisymétrie de l'écoulement dans une cavité de rapport d'aspect réduit (h=1 et 1,5) et des nombres de Reynolds Re<8500. Les équations de Navier-Stokes sont résolues par un code vitesse-pression en coordonnées cylindriques qui repose sur des méthodes aux différences finies du second ordre. Deux approches numériques sont mises en œuvre
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39

Legrand, Mathias. "Modèles de prédiction de l'interaction rotor/stator dans un moteur d'avion." Phd thesis, Ecole centrale de nantes - ECN, 2005. http://tel.archives-ouvertes.fr/tel-00011631.

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Ces travaux s'inscrivent dans le cadre d'un partenariat entre SNECMA (Société Nationale d'Etude et de Construction de Moteurs d'Avion), l'Equipe Structures et Simulations du laboratoire GeM à l'Ecole Centrale de Nantes et le Département de Vibrations et d'Acoustique de l'Université du Michigan, avec pour objectif le développement de modèles de prédiction d'interaction rotor/stator dans un moteur d'avion. En effet, afin de rester un acteur compétitif, un motoriste a un objectif principal : augmenter le rendement d'un moteur d'avion en accord avec les normes en vigueur. La minimisation du jeu en
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40

Jurdic, Vincent. "An investigation into fan broadband noise due to rotor-stator interaction." Thesis, University of Southampton, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.536289.

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41

Urban, Kai [Verfasser]. "Zum Emulgieren mit Dispergierscheiben, Rotor-Stator- und Hochdruck-Systemen / Kai Urban." Aachen : Shaker, 2007. http://d-nb.info/1170527450/34.

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42

Arzpeima, Minoo. "CFD Investigation of Flow Structures in Rotor-Stator Disc Cavity Systems." Thesis, KTH, Kraft- och värmeteknologi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-153733.

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43

El-Oun, Z. B. "Flow in a shrouded rotor-stator cavity with pre-swirl coolant." Thesis, University of Sussex, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379447.

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44

Dadkhah, S. "Ingestion and sealing performance of rim seals in rotor-stator wheelspaces." Thesis, University of Sussex, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.328303.

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45

Utomo, Adi Tjipto. "Flow patterns and energy dissipation rates in batch rotor-stator mixers." Thesis, University of Birmingham, 2009. http://etheses.bham.ac.uk//id/eprint/501/.

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The flow pattern and distribution 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) measurements. The agreement between predicted and measured velocity profiles in the bulk and of jet emerging from stator hole was very good. Results showed that the interaction between stator and rotating blades generated periodic fluctuations of jet velocity, flowrate, torque and e
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Gord, Mahmoud Farzaneh. "Flow and heat transfer in a pre-swirl rotor-stator system." Thesis, University of Bath, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.288236.

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This thesis describes the computational study of the flow and heat transfer in a directtransfer pre-swirl rotor-stator system. Pre-swirl cooling air enters the system at low radius through angled pre-swirl nozzles, located on the stator, impinges on the rotor and flows outward in the wheel-space between stator and rotor, and leaves the system through receiver holes, located on the rotor. Computations were carried out using a 3D incompressible model, with one discrete pre-swirl nozzle on the stator and cyclic symmetry boundary conditions applied at the tangential faces of the domain. To permit
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47

Dallia, Barbosa Emerson. "Etude numérique des écoulements tridimensionnels dans des cavités rotor- stator cylindriques." Evry-Val d'Essonne, 2002. https://tel.archives-ouvertes.fr/tel-00354646.

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L'écoulement d'un fluide visqueux imcompressible dans une cuve cylindrique rotor-stator est étudié. Ces écoulements ont fait l'objet de récents travaux numériques tridimensionnels pour des rapports d'aspect h &gt; 1. 75. On propose une étude numérique de la rupture de l'axisymétrie de l'écoulement dans une cavité de rapport d'aspect réduit (h = 1 et 1. 5) et des nombres de Reynolds Re &lt; 8500. Les équations de Navier-Stokes sont résolues par un code vitesse-pression en coordonnées cylindriques qui repose sur des méthodes aux différences finies du second ordre. Deux approches numériques sont
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48

Parras, Blázquez Pedro Santiago. "CFD Analysis of Pressure Instabilities in Stator-Rotor Disc Cavity Systems." Thesis, Linköpings universitet, Mekanisk värmeteori och strömningslära, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-140904.

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The continuous demand to improve turbine performance has led manufactures to focus on aspects that have been previously considered of secondary importance such as the secondary air system. The purpose of this system is to cool the components and prevent ingestion of hot gas into the stator-rotor cavity that could lead to low frequency pressure fluctuations called Cavity Flow Instabilities. These instabilities could cause unpredictable rotor vibrations and damage several components. A CFD method capable of detecting cavity flow instabilities in a rotor-stator disk cavity system is investigated,
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49

Gao, Zhi. "Sensorless Stator Winding Temperature Estimation for Induction Machines." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/13966.

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The organic materials used for stator winding insulation are subject to deterioration from thermal, electrical, and mechanical stresses. Stator winding insulation breakdown due to excessive thermal stress is one of the major causes of electric machine failures; therefore, prevention of such a failure is crucial for increasing machine reliability and minimizing financial loss due to motor failure. This work focuses on the development of an efficient and reliable stator winding temperature estimation scheme for small to medium size mains-fed induction machines. The motivation for the stator
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50

Wills, Dominic. "Methods to quantify and reduce rotor losses in a solid rotor yoke permanent magnet machine." Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/4014.

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Thesis (PhD (Electrical and Electronic Engineering))--University of Stellenbosch, 2010.<br>ENGLISH ABSTRACT: Certain types of electric machines are particularly susceptible to the proliferation of eddy currents flowing within the solid conducting regions in the rotor. Single-layer, non-overlapping windings within uneven open slots are some stator properties that can produce damaging, asynchronous magnetic field harmonics which manifest in the rotor as eddy currents. The ohmic losses caused by these eddy currents are a source of inefficiency and can cause a marked increase in the temperatu
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