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Dissertations / Theses on the topic 'Boundary layer turbine'

Author: Grafiati

Published: 4 June 2021

Last updated: 9 March 2023

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1

Hachem, Farouk H. "Boundary layer transition on concave surfaces." Thesis, University of Liverpool, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.279702.

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2

Graham, Derek. "Boundary layer transition in simulated turbine blade flow." Thesis, University of Abertay Dundee, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.280568.

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3

Tarada, F. H. A. "Heat transfer to rough turbine blading." Thesis, University of Sussex, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379448.

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4

Öhlund, Olof. "Wind Turbine Sound Propagation in the Atmospheric Boundary Layer." Licentiate thesis, Uppsala universitet, Luft-, vatten och landskapslära, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-224205.

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Wind turbines have grown both in size and number in the past decades. The taller turbines has made it possible to place them in forest areas which is fortunate for a country like Sweden with lots of forest. An issue with wind turbines is the sound they produce. The sound mainly comes from the rotor blades when they pass through the air. The sound heard some distance away from the turbine is sometimes masked by ambient background noise such as wind induced sound in the vegetation, but this is not always the case. Noise concerns among some people living in the vicinity of wind turbines are somet

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5

Steptoe, William James. "Integral boundary layer heat transfer prediction on turbine blades." Thesis, Massachusetts Institute of Technology, 1989. http://hdl.handle.net/1721.1/42188.

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6

Melius, Matthew Scott. "Identification of Markov Processes within a Wind Turbine Array Boundary Layer." PDXScholar, 2013. https://pdxscholar.library.pdx.edu/open_access_etds/1422.

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The Markovianity within a wind turbine array boundary layer is explored for data taken in a wind tunnel containing a model wind turbine array. A stochastic analysis of the data is carried out using Markov chain theory. The data were obtained via hot-wire anemometry thus providing point velocity statistics. The theory of Markovian processes is applied to obtain a statistical description of longitudinal velocity increments inside the turbine wake using conditional probability density functions. It is found that two and three point conditional probability density functions are similar for scale d

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7

Kim, Kyoungjin. "Computation of wake-passing effects on turbine blade boundary layers /." Digital version accessible at:, 1998. http://wwwlib.umi.com/cr/utexas/main.

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8

Watt, Robert McFarlane. "Effects of surface roughness on the boundary-layer characteristics of turbine aerofoils." Thesis, University of Oxford, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.330065.

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9

Arnold, Benjamin [Verfasser]. "Wind Turbine Noise Reduction by Means of Boundary Layer Suction / Benjamin Arnold." München : Verlag Dr. Hut, 2019. http://d-nb.info/1198542713/34.

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10

Svensdotter, Susanne. "Investigation of boundary layer transition for transonic flow over compressor and turbine airfoils /." Stockholm : Tekniska högsk, 1998. http://www.lib.kth.se/abs98/sven1214.pdf.

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11

Emran, Tamir Ali. "Tesla Turbine Torque Modeling for Construction of a Dynamometer and Turbine." Thesis, University of North Texas, 2011. https://digital.library.unt.edu/ark:/67531/metadc67979/.

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While conventional turbines have been extensively researched and tested, Tesla and boundary layer type turbines have not. In order to construct a dynamometer, thermodynamic flow apparatus and future turbines, we modeled the Tesla turbine using theoretical calculations and preliminary experiments. Thus a series of experiments were run to determine stall torque and maximum run speed for a known pressure range. This data was then applied to modeling formulas to estimate stall torque over an extended range of variables. The data were then used to design an appropriate dynamometer and airflow exper

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12

Lynch, Stephen P. "The Effect of Endwall Contouring On Boundary Layer Development in a Turbine Blade Passage." Diss., Virginia Tech, 2011. http://hdl.handle.net/10919/77202.

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Increased efficiency and durability of gas turbine components is driven by demands for reduced fuel consumption and increased reliability in aircraft and power generation applications. The complex flow near the endwall of an axial gas turbine has been identified as a significant contributing factor to aerodynamic loss and increased part temperatures. Three-dimensional (non-axisymmetric) contouring of the endwall surface has been shown to reduce aerodynamic losses, but the effect of the contouring on endwall heat transfer is not well understood. This research focused on understanding the gen

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13

Khorsand, Khashayar. "Numerical heat transfer studies and test rig preparation on a gas turbine nozzle guide vane." Thesis, KTH, Kraft- och värmeteknologi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-144412.

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Heat transfer study on gas turbine blades is very important due to the resultant increase in cycle thermal efficiency. This study is focused on the heat transfer effects on a reference nozzle guide vane and test rig component preparation in heat and power technology division at KTH. In order to prepare the current test rig for heat transfer experiments, some feature should be changed in the current layout to give a nearly instant temperature rise for heat transfer measurement. The heater mesh component is the main component to be added to the current test rig. Some preliminary design parameter

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14

Garside, Thomas. "The heat transfer and aerodynamic performance of a rotating turbine in the absence of upstream nozzle guide vanes." Thesis, University of Oxford, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.297061.

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15

Yoshida, Brian Richard. "Compuational analysis of boundary layer control by suction in a space transfer vehicle engine turbopump diffuser /." Online version of thesis, 1992. http://hdl.handle.net/1850/11058.

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16

Tiedemann, Maik. "Investigation of the unsteady rotor boundary layer transition in a transonic high pressure turbine stage /." Köln : DLR, Dt. Zentrum für Luft- und Raumfahrt e.V., Abt. Operative Planung, 1998. http://www.gbv.de/dms/bs/toc/265671930.pdf.

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17

Pastor, Diego Garcia. "The study of boundary layer control in a turbopump diffuser with fluid injection /." Online version of thesis, 1996. http://hdl.handle.net/1850/12290.

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18

Zhang, Di. "Turbulence Modeling and Simulation of Unsteady Transitional Boundary Layers and Wakes with Application to Wind Turbine Aerodynamics." Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/81137.

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Wind energy industry thrived in the last three decades, environmental concerns and government regulations stimulate studies on wind farm location selection and wind turbine design. Full-scale experiments and high-fidelity simulations are restrictive due to the prohibitively high cost, while the model-scale experiments and low-fidelity calculations miss key flow physics of unsteady high Reynolds number flows. A hybrid RANS/LES turbulence model integrated with transition formulation is developed and tested by a surrogate model problem through joint experimental and computational fluid dynamics a

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19

Reimann, Daniel D. "Effects of Spanwise and Discrete Disturbances on Separating Boundary Layers on Low Pressure Turbine Blades." Diss., CLICK HERE for online access, 2007. http://contentdm.lib.byu.edu/ETD/image/etd1761.pdf.

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20

Giannopoulos, Evangelos. "Aerodynamic performance of a wind-turbine rotor by means of OpenFOAM." Thesis, KTH, Mekanik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-199912.

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In order for wind-farm operators to deal with challenges regarding their fleet management, it is useful for them to estimate their units’ performance for different conditions. To perform such estimations, Computational Fluid Dynamics (CFD) may be used. This project focuses on the development of a CFD model for the aerodynamic analysis of wind turbine rotors, depending on their surface roughness. The work has been carried out in collaboration with the KTH Royal Institute of Technology and the Vattenfall AB R&D department. The open-source software OpenFOAM has been used to develop the desire

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21

Englberger, Antonia [Verfasser], and George C. [Akademischer Betreuer] Craig. "Response of the wind-turbine wake to a turbulent atmospheric boundary-layer flow / Antonia Englberger ; Betreuer: George C. Craig." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2017. http://d-nb.info/1148276416/34.

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22

Dogan, Eda. "Experimental Investigation Of Boundary Layer Separation Control Using Steady Vortex Generator Jets On Low Pressure Turbines." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614485/index.pdf.

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This thesis presents the results of an experimental study that investigates the effects of steady vortex generator jets (VGJs) integrated to a low pressure turbine blade to control the laminar separation bubble occurring on the suction surface of the blade at low Reynolds numbers. The injection technique involves jets issued from the holes located near the suction peak of the test blade which is in the middle of a five-blade low speed linear cascade facility. Three injection cases are tested with different blowing ratio values ranging from low to high. Surface pressure and particle image veloc

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23

Joseph, Liselle AnnMarie. "Transition Detection for Low Speed Wind Tunnel Testing Using Infrared Thermography." Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/78145.

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Transition is an important phenomenon in large scale, commercial, wind tunnel testing at low speeds because it is an excellent indicator of an airfoil performance. It is difficult to estimate transition through numerical techniques because of the complex nature of viscous flow. Therefore experimental techniques can be essential. Over the transition region the rate of heat transfer shows significant increases which can be detected using infrared thermography. This technique has been used predominantly at high speeds, on small models made of insulated materials, and for short test runs. Large sc

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24

Hansen, Laura C. "Phase Locked Flow Measurements of Steady and Unsteady Vortex Generator Jets in a Separating Boundary Layer." Diss., CLICK HERE for online access, 2005. http://contentdm.lib.byu.edu/ETD/image/etd763.pdf.

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25

Ludwig, Daniel Evandro. "Análise numérica da influência de fatores atmosféricos na esteira aerodinâmica de turbinas eólicas." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2011. http://hdl.handle.net/10183/30132.

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A evolução do uso da energia eólica nas últimas décadas está diretamente relacionada ao de-senvolvimento da tecnologia empregada na conversão e projeto das instalações. Neste contex-to o presente trabalho apresenta um estudo sobre a influência de fatores atmosféricos, tais como a turbulência e a presença de um perfil de velocidades referentes à camada limite at-mosférica, no desenvolvimento da esteira aerodinâmica de uma turbina eólica dimensionada segundo a teoria de Betz. O estudo é realizado utilizando o método dos volumes finitos para a solução das equações de Navier-Stokes com Médias de R

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26

Vinci, Samuel J. "CFD SIMULATIONS FOR THE EFFECT OF UNSTEADY WAKES ON THE BOUNDARY LAYER OF A HIGHLY LOADED LOW PRESSURE TURBINE AIRFOIL (L1A)." Cleveland State University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=csu1307111386.

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27

Polat, Ozge. "Genetic Algorithm Based Aerodynamic Shape Optimization Of Wind Turbine Rotor Blades Using A 2 D Panel Method With A Boundary Layer Solver." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613970/index.pdf.

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This thesis presents an aerodynamic shape optimization methodology for rotor blades of horizontal axis wind turbines. Genetic Algorithm and Blade Element Momentum Theory are implemented in order to find maximum power production at a specific wind speed, rotor speed and rotor diameter. The potential flow solver, XFOIL, provides viscous aerodynamic data of the airfoils. Optimization variables are selected as the sectional chord length, the sectional twist and the blade profiles at root, mid and tip regions of the blade. The blade sections are defined by the NACA four digit airfoil series or arbi

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28

Ozturk, Burak. "Combined effects of Reynolds number, turbulence intensity and periodic unsteady wake flow conditions on boundary layer development and heat transfer of a low pressure turbine blade." [College Station, Tex. : Texas A&M University, 2006. http://hdl.handle.net/1969.1/ETD-TAMU-1150.

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29

Clark, Kenneth Phillip. "Numerical Analysis on the Effects of Blade Loading on Vortex Shedding and Boundary Layer Behavior in a Transonic Axial Compressor." BYU ScholarsArchive, 2011. https://scholarsarchive.byu.edu/etd/2652.

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Multiple high-fidelity, time-accurate computational fluid dynamics simulations were performed to investigate the effects of upstream stator loading and rotor shock strength on vortex shedding characteristics in a single stage transonic compressor. Various configurations of a transonic axial compressor stage, including three stator/rotor axial spacings of close, mid, and far in conjunction with three stator loadings of decreased, nominal, and increased were simulated in order to understand the flow physics of transonic blade-row interactions. Low-speed compressors typically have reduced stator/

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30

Just, Jan. "Aerodynamika axiálních větrných turbín." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230621.

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This master thesis concerns about problematics of wind turbines. The document summarizes basic theory based on the law of momentum conservation which is essential tool for the design and calculation of wind turbines. The theory is complemented by number of correction factors and then used in the design of wind turbine for specific parameters. The calculation is performed iteratively using Matlab software and the actual code is given in appendix. Graphs summarizing the progress of various units along the blades are presented in the document. The final section briefly describes advanced topics o

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31

Hart, M. "Boundary layers on turbine blades." Thesis, University of Cambridge, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305764.

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32

Kleruu, Alfred Andrew. "Assessment of the effect of a Heterogeneous forest on a Wind Farm using Large Eddy Simulation." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.

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Forest areas are becoming more and more potential places for the placement of wind farms in the onshore areas. Thus it becomes inevitable to study the impact the forests have on wind turbines which are placed in forest areas. This thesis work is the second and the final part of the thesis titled "CFD modeling of the Neutral Atmospheric Boundary Layer above Inhomogeneous forest" in which the effect that the heterogeneous forest canopy has on the wind mean flow field and turbulence on a wind farm is studied. A forest with a homogeneous canopy distribution is also studied and used to draw compar

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33

Dong, Yuan. "Boundary layers on compressor blades." Thesis, University of Cambridge, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.278266.

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34

Schulte, Volker Benno. "Unsteady separated boundary layers in axial-flow turbomachinery." Thesis, University of Cambridge, 1995. https://www.repository.cam.ac.uk/handle/1810/252035.

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35

Ferria, Hakim. "Contribution to Numerical and Experimental Studies of Flutter in Space Turbines. Aerodynamic Analysis of Subsonic or Supersonic Flows in Response to a Prescribed Vibratory Mode of the Structure." Phd thesis, Ecole Centrale de Lyon, 2011. http://tel.archives-ouvertes.fr/tel-00677648.

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Modern turbomachines are designed towards thinner, lighter and highly loaded blades. This gives rise to increased sensitivity to flow induced vibrations such as flutter, which leads to structure failure in a short period of time if not sufficiently damped. Although numerical tools are more and more reliable, flutter prediction still depends on a large degree on simplified models. In addition, the critical nature of flutter, resulting in poor welldocumented real cases in the open literature, and the lack of experimental database typical of engine flows make its apprehension even more challengin

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36

Babajee, Jayson. "Detailed numerical characterization of the separation-induced transition, including bursting, in a low-pressure turbine environment." Phd thesis, Ecole Centrale de Lyon, 2013. http://tel.archives-ouvertes.fr/tel-00984351.

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La turbine basse-pression est un composant essentiel d'un turboréacteur car elle entraine la soufflante qui génère la plus grande partie de la poussée dans la configuration actuelle des turboréacteurs à double flux. Dans la perspective d'accroître son rendement en termes de consommation de carburant, il y a une recherche permanente dans la réduction du nombre d'aubage (c'est-à-dire la réduction de la masse) qui implique un chargement plus élevé par aube de rotor. Cet environnement est caractérisé par un écoulement dont le nombre de Reynolds est faible ainsi qu'une large diffusion le long de la

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37

Coull, John David. "Wake induced transition in low pressure turbines." Thesis, University of Cambridge, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.608541.

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38

Thomson, Allan. "Prediction of transitional boundary layer properties for CFD software in engineering flows." Thesis, Abertay University, 1997. https://rke.abertay.ac.uk/en/studentTheses/42cadbec-e359-48a5-91a7-71bde28039ed.

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Two linear combination models for the transition zone in two-dimensional incompressible boundary layers have been programmed into the commercially available computational fluid dynamics software suite of programs, PHOENICS as a sink of momentum. It has been shown that it was possible to use a laminar velocity profile to predict laminar, transitional and turbulent boundary layer parameters. Method one, attributable to Fraser, Higazy and Milne (1994), was tested against a variety of flows including zero and constant adverse and favourable pressure gradients, and also the varying pressure gradien

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39

Odemark, Ylva. "Wind-turbine wake flows - Effects of boundary layers and periodic disturbances." Doctoral thesis, KTH, Strömningsfysik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-144475.

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The increased fatigue loads and decreased power output of a wind turbine placed in the wake of another turbine is a well-known problem when building new wind-power farms and a subject of intensive research. These problems are caused by the velocity gradients and high turbulence levels present in the wake of a turbine. In order to better estimate the total power output and life time of a wind-power farm, knowledge about the development and stability of wind-turbine wakes is crucial. In the present thesis, the flow field around small-scale model wind turbines has been investigated experimentally

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40

Joulin, Pierre-Antoine. "Modélisation à fine échelle des interactions entre parcs éoliens et météorologie locale." Thesis, Toulouse, INPT, 2019. http://www.theses.fr/2019INPT0135.

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Le développement des énergies éoliennes, encouragé par le projet de Programmation Pluriannuelle de l’Énergie, soulève de nouvelles questions. Certains parcs s’orienteront vers des terrains montagneux et offshore. Pour prévoir la production énergétique et tenter de l’optimiser, une meilleure compréhension de l’écoulement du vent au sein des fermes sur ce type de terrains est nécessaire. Par ailleurs, les éoliennes offshore, de plus en plus grandes, seront amenées à interagir plus fortement avec la météorologie locale. Il semble alors important de caractériser ces interactions. Pour répondre à c

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41

Stieger, Rory Douglas. "The effect of wakes on separating boundary layers in low pressure turbines." Thesis, University of Cambridge, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.620491.

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42

Vera, Morales María. "The effect of compressibility on unsteady boundary layers in high lift low pressure turbines." Thesis, University of Cambridge, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.616208.

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43

Štefan, David. "Struktura proudění a energetické přeměny v kolenové sací troubě." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229640.

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Draft tube is very important part of hydraulic turbines. Only optimum work together with turbine can bring highest performance of this machine set. Hence it is necessary to deal with character of flow in the draft tube for different operating conditions. Efficiency of the draft tube depends on many phenomena of flow. Observing these phenomena and finding their relation with energetic transformation in the draft tube is a suitable tool to judge quality of draft tube performance. Incorrect design of the draft tube can sometimes cause lower efficiency of whole machine set. The goal of this thesis

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44

McClain, Stephen Taylor. "A discrete-element model for turbulent flow over randomly-rough surfaces." Diss., Mississippi State : Mississippi State University, 2002. http://library.msstate.edu/etd/show.asp?etd=etd-04032002-140007.

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45

Cadel, Daniel R. "Advanced Instrumentation and Measurements Techniques for Near Surface Flows." Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/72968.

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The development of aerodynamic boundary layers on wind turbine blades is an important consideration in their performance. It can be quite challenging to replicate full scale conditions in laboratory experiments, and advanced diagnostics become valuable in providing data not available from traditional means. A new variant of Doppler global velocimetry (DGV) known as cross-correlation DGV is developed to measure boundary layer profiles on a wind turbine blade airfoil in the large scale Virginia Tech Stability Wind Tunnel. The instrument provides mean velocity vectors with reduced sensitivity to

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46

Rivera, William Gómez. "Estudo da sucção no controle da separação da camada limite em perfis para turbinas eólicas." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/18/18148/tde-26072016-102229/.

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Nas últimas décadas o uso da energia eólica tem apresentado uma maior participação na matriz energética mundial. Como consequência, o tamanho das turbinas eólicas tem aumentado, procurando aproveitar uma quantidade maior de vento e em alturas onde a velocidade é menos afetada pela turbulência atmosférica. Isto gera custos maiores devido ao investimento em novos materiais e tecnologias de fabricação. O projeto de novos perfis aerodinâmicos e o desenvolvimento de técnicas de controle da camada limite têm providenciado melhoras na eficiência aerodinâmica das turbinas, permitindo o aproveitamento

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47

Shenoy, Rajiv. "Overset adaptive strategies for complex rotating systems." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/51796.

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The resolution of the complex physics of rotating configurations is critical for any engineering analysis that requires multiple frames of reference. Two well-known applications are in the rotorcraft and wind energy industries. Rotor wake impingement from rotor-fuselage and wind turbine-tower interactions impact structural and acoustic characteristics. Additionally, parasite drag resulting from rotorcraft hubs may result in severe limitations on forward flight vehicle performance. Complex turbulent wakes from rotors and hubs impinging on downstream empennage can create adverse aeroelastic beha

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48

"Challenging the Versatility of the Tesla Turbine: Working Fluid Variations and Turbine Performance." Master's thesis, 2012. http://hdl.handle.net/2286/R.I.16051.

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abstract: Tesla turbo-machinery offers a robust, easily manufactured, extremely versatile prime mover with inherent capabilities making it perhaps the best, if not the only, solution for certain niche applications. The goal of this thesis is not to optimize the performance of the Tesla turbine, but to compare its performance with various working fluids. Theoretical and experimental analyses of a turbine-generator assembly utilizing compressed air, saturated steam and water as the working fluids were performed and are presented in this work. A brief background and explanation of the technology

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49

Wuu, Shiang-Jye, and 伍湘杰. "Effect of Turbulence on the Development of Boundary Layer on the Turbine Cascade." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/13915353641564147806.

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碩士<br>國立成功大學<br>航空太空工程學系<br>83<br>The purpose of this study is to investigate the effect of turbulence on the development of boundary layer on the turbine cascade. The freestream turbulence was controlled by three different kinds of grids, characterized by the turbulence intensities, ranging from 1.6% to 5.0%, and the integral length scales, ranging from 4.69mm to 9.55mm. Experiments were conducted in a low speed wind tunnel, including (1)the calibration of

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50

Sin-AnLin and 林信安. "An Experimental Study of the Interaction between Wind Turbine Wake and Atmospheric Boundary Layer." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/88911822704536824410.

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碩士<br>國立成功大學<br>航空太空工程學系<br>102<br>SUMMARY This paper examines experimentally the wake characteristics of a model wind turbine and a porous disk in turbulent boundary layers, respectively. The experiments simulating the atmospheric boundary layer flow condition were conducted in an environmental wind tunnel. Under the experimental condition, two boundary layers of different thickness, about 5.5D and 1.85D, where D denotes the diameter of model blade. The velocity measurements were based on the hot-wire anemometer. Hilbert Huang Transform had been used to analysis the turbulent characteristics

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