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Dissertations / Theses on the topic 'Blade channel'

Author: Grafiati

Published: 30 May 2022

Last updated: 31 July 2025

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1

Karpik, A., and Yu Vorobiev. "Nonlinear Analysis of Gas Flow in Compressors Stage Based on CFD-Method." Thesis, NTU "KhPI", 2016. http://repository.kpi.kharkov.ua/handle/KhPI-Press/24955.

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The numerical simulation of a three-dimensional viscous flow in cascade of the axial compressor of low pressure of the gas-turbine engine is presented. The results of a flow in the first stage o f the compressor in nonstationary three-dimensional statement are obtained in the solver F. Velocity and pressure fields are received as a result.

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2

Ricklick, Mark. "CHARACTERIZATION OF AN INLINE ROW IMPINGEMENT CHANNEL FOR TURBINE BLADE COOLING APPLICATIONS." Doctoral diss., University of Central Florida, 2009. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2696.

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Gas turbines have become an intricate part of today's society. Besides powering practically all 200,000+ passenger aircraft in use today, they are also a predominate form of power generation when coupled with a generator. The fact that they are highly efficient, and capable of large power to weight ratios, makes gas turbines an ideal solution for many power requirement issues faced today. Designers have even been able to develop small, micro-turbines capable of producing efficient portable power. Part of the turbine's success is the fact that their efficiency levels have continuously risen sin

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3

Roclawski, Harald. "PIV Measurements of Channel Flow with Multiple Rib Arrangements." UKnowledge, 2001. http://uknowledge.uky.edu/gradschool_theses/303.

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A model of a gas turbine blade cooling channel equipped with turbulators and a backward facing step geometry was examined. Up to four turbulators oriented cross-stream and inclined 45° to the flow direction were mounted in the channel. The blockage ratio b/H of the turbulators and the height h/H of the backward facing step was 0:125 and 0:14 respectively. The number of turbulators as well as their size was varied. In a preliminary investigation, hot-wire and pressure measurements were taken for three different Reynolds numbers (5,000, 12,000, 18,000)in the center plane of the test section. Sub

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4

Bhattarai, Kripesh. "On the Use of a Digital Communication Channel for Feedback in a Position Control System." University of Akron / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=akron1353512595.

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5

Rupakula, Venkata Panduranga Praveen. "Determination of heat (mass) transfer from blockages with round and elongated holes in a wide rectangular channel." Texas A&M University, 2005. http://hdl.handle.net/1969.1/4977.

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Mass transfer experiments were conducted to study the thermal performance characteristics of blockages with round and elongated holes, positioned in a 12:1 rectangular channel. Naphthalene sublimation technique was adopted to conduct experiments with four different blockage configurations, flow rates corresponding to Reynolds numbers (based on channel hydraulic diameter) of 7,000 and 17,000, and at three blockage locations. The hole area to channel area ratio for all four blockage configurations was the same at 0.196. The hole width was half the channel height, and the distance between consecu

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6

Liu, Yao-Hsien. "Heat transfer in leading and trailing edge cooling channels of the gas turbine blade under high rotation numbers." [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-3196.

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7

Waidmann, Christian [Verfasser]. "Heat Transfer Measurements in Rotating Turbine Blade Cooling Channel Configurations using the Transient Thermochromic Liquid Crystal Technique / Christian Waidmann." München : Verlag Dr. Hut, 2021. http://d-nb.info/1232847747/34.

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8

Nagaiah, Narasimha. "Multiobjective Design Optimization of Gas Turbine Blade with Emphasis on Internal Cooling." Doctoral diss., University of Central Florida, 2012. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5350.

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In the design of mechanical components, numerical simulations and experimental methods are commonly used for design creation (or modification) and design optimization. However, a major challenge of using simulation and experimental methods is that they are time-consuming and often cost-prohibitive for the designer. In addition, the simultaneous interactions between aerodynamic, thermodynamic and mechanical integrity objectives for a particular component or set of components are difficult to accurately characterize, even with the existing simulation tools and experimental methods. The current r

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9

Mhetras, Shantanu. "Experimental study of gas turbine blade film cooling and internal turbulated heat transfer at large Reynolds numbers." [College Station, Tex. : Texas A&M University, 2006. http://hdl.handle.net/1969.1/ETD-TAMU-1820.

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10

Waidmann, Christian [Verfasser], and Jens von [Akademischer Betreuer] Wolfersdorf. "Heat transfer measurements in rotating turbine blade cooling channel configurations using the transient thermochromic liquid crystal technique / Christian Waidmann ; Betreuer: Jens von Wolfersdorf." Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2020. http://d-nb.info/122943853X/34.

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11

Parida, Pritish Ranjan. "Optimization and Fabrication of Heat Exchangers for High-Density Power Control Unit Applications." Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/77165.

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The demand for more power and performance from electronic equipment has constantly been growing resulting in an increased amount of heat dissipation from these devices. Thermal management of high-density power control units for hybrid electric vehicles is one such application. Over the last few years, the performance of this power control unit has been improved and size has been reduced to attain higher efficiency and performance causing the heat dissipation as well as heat density to increase significantly. However, the overall cooling system has remained unchanged and only the heat exchanger

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12

Diette, Christophe. "Measurement and analysis of forced convection phenomena in blade cooling channels." Valenciennes, 2003. http://ged.univ-valenciennes.fr/nuxeo/site/esupversions/c76547a4-820c-48f8-9717-ced740f0cb38.

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Dealing with gas turbine aircraft engines, the Turbine Entry Temperature (TET) is generally targeted as high as possible. Increasing this parameter leads to higher thermodynamic efficiency and power output and reduces the weight-to-thrust ratio and the Specific Fuel Consumption (SFC). Since the maximum permissible TET is determined by the temperature limitations of the turbine assembly, the choice of turbine material and the design of cooling systems applied to turbine blades are essential. This work reports both an experimental and numerical investigation on internal blade cooling cavities. V

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13

Barbiero, Franck. "Antibrouillage de récepteur GNSS embarqué sur hélicoptère." Thesis, Toulouse, ISAE, 2014. http://www.theses.fr/2014ESAE0052.

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En environnements hostiles, les signaux GNSS (Global Navigation Satellite System)peuvent être soumis à des risques de brouillages intentionnels. Basées sur un réseau d'antennes adaptatif, les solutions spatio-temporelles (STAP) ont déjà montré de bonnes performances de réjection des interférences. Toutefois, lorsque le module GNSS est placé sous les pales d'un hélicoptère, des effets non-stationnaires, appelés Rotor Blade Modulation (RBM), créés par les multiples réflexions du signal sur les pales du rotor, peuvent dégrader les techniques usuelles d’antibrouillage. Le signal utile GNSS n’est a

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14

Jiang, Zhengyi. "Design, development and testing of an automated system for measuring wall thicknesses in turbine blades with cooling channels." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/design-development-and-testing-of-an-automated-system-for-measuring-wall-thicknesses-in-turbine-blades-with-cooling-channels(895ac153-e310-40e2-87c6-4e40654c9d5d).html.

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Cooling channels are designed in blades to protect the blades from damage at high temperature in a gas turbine. ELE Advanced Technology Ltd. is a UK company specialised in machining cooling channels in turbine blades using electro-chemical techniques. The wall thicknesses between these cooling channels and the surface of the turbine blade influences the performance of cooling channels and are required to be accurately machined and then inspected. At present, the company measures the wall thicknesses using a hand-held contact ultrasonic probe, which is time-consuming and not very accurate. In t

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15

Doussot, François. "Simulation numérique de l'écoulement de charge partielle dans les turbines Francis : analyse de la topologie et de la dynamique des vortex inter-aubes." Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAI069.

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Les machines hydrauliques sont conçues pour fonctionner essentiellement autour du point de fonctionnement nominal. Cependant, afin notamment d'intégrer les énergies renouvelables sur le réseau, ces machines hydrauliques doivent nécessairement faire preuve de flexibilité. Ainsi, la plage de fonctionnement des turbines Francis cherche à être étendue, notamment pour des fonctionnements à des débits plus faibles. Lorsqu'une turbine Francis fonctionne avec un débit compris entre 30 et 60% du débit nominal, l'écoulement dans la roue est caractérisé par la présence de vortex entre les aubes. Dans ces

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16

Duda, Petr. "Optimalizace polohy propelerové turbíny v kašně." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231499.

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The thesis contains basic information about propeler turbines. It deals with the correct location in the fountain so as to ensure the highest possible performance. Part of the work is devoted to the all-weather resulting blade to blade channels and their impact on the room is filled with diffuser.

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17

Khamaj, J. A. J. "An experimental study of heat transfer in the cooling channels of gas turbine rotor blades." Thesis, Swansea University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.637783.

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This thesis presents an investigation of experimental research into the effect of rotation on the convective heat transfer mechanism inside the cooling channels of turbine rotor blades. These involved the selection of eleven different channel geometries and these have been designated alphabetically by the letters 'A' through 'K' respectively. These channels involve a collection of basic geometrical duct cross sectional shapes with the incorporation of ribbed surfaces. The leading and trailing edges of the duct are fitted with in-line or staggered ribs aligned at 30° to 45° to the central axis

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18

VENTURINO, GIULIO. "Thermal and fluid dynamic analysis of corrugated channels for the internal cooling of turbine blades." Doctoral thesis, Università degli studi di Genova, 2022. http://hdl.handle.net/11567/1073616.

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Il principale scopo di questa relazione è lo studio, mediante simulazioni numeriche, dello scambio termico in un canale rettangolare di aspect ratio pari a 5, dotato di nervature inclinate di 45° su uno o due lati. Le rimanenti superfici del canale sono state considerate lisce e non riscaldate. Le dimensioni del dominio computazionale sono le stesse dell’impianto sperimentale nel dipartimento del DIME, il cui utilizzo ha consentito di ricavare dati sperimentali utili per la validazione dei risultati numerici che verranno presentati. Per le simulazioni numeriche il software Ansys Fluent 19.2

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19

Farhadi, Rahmat-Abadi K. "An experimental investigation of the combined effect of rotation and internal ribbing on heat transfer in turbine rotor blade cooling channels." Thesis, Swansea University, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.636955.

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This thesis reports the results of an experimental investigation of the effect of orthogonal rotation and radially outward flow on heat transfer inside circumferentially ribbed circular test sections. These test sections are intended to model the internal cooling passages of gas turbine rotor blades to enable them to run at elevated operating temperature. Four test section geometries were used with active length to bore diameter ratios of 6.5, 9.75, 11.0 and 13.0. Tests were performed on stationary and rotating sections, with through flow Reynolds numbers in the range 15 000 to 30 000. The res

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20

Sampath, Aravind Rohan. "Effect of Rib Turbulators on Heat Transfer Performance in Stationary Ribbed Channels." Cleveland State University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=csu1261062722.

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21

Ibrahim, Hala-Asmina. "Sudan : a nation in turmoil - is eduaction [sic] to blame? ; an analysis of basic schools curriculum /." Saarbrücken, Germany : VDM Verlag Dr. Müller, 2008. http://d-nb.info/98845906X/04.

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22

Ramirez, Karen. "Can Changes to Tax Policy Have an Impact on a Shrinking Middle Class? : An explorative and comparative case study of changes to tax policy in Sweden and the United States." Thesis, Uppsala universitet, Statsvetenskapliga institutionen, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-385750.

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23

Klíma, Petr. "Parní turbina rychloběžná kondenzační." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231803.

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ith one controlled extraction and one uncontrolled extraction, calculation of the flow channel at all stage, design and calculation of the regulation valve and create connection diagram of steam turbine and air cooled condenser. At the beginning of this work is an overview of manufacturers of steam turbines and their unified products. Master thesis was developer with G-Team, a.s. as using calculations and the instructions given in the recommended literature with supporting CFD simulations to determine the loss coefficients and FEA simulations to determine the eigenfrequencies blades.

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24

Li, Yi-Chen, and 李宜宸. "NUMERICAL STUDIES ON OBSTRUCTED CHANNEL FLOWS RELEVANT TO TURBINE BLADE COOLING AND INTRACRANIAL ANEURYSM THERAPY." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/49030848180677155618.

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25

Yin-HaoTseng and 曾胤豪. "Application of Lattice Boltzmann Method to Convective Heat Transfer in the channel with an Oscillating Blade." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/82892602121745026292.

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碩士<br>國立成功大學<br>航空太空工程學系碩博士班<br>100<br>In this study, the lattice Boltzmann method is applied to simulate the effect of flow field and convection heat transfer of the heating cylinder in the channel with an oscillating blade. The effect of blade parameters and the Reynolds number of inlet flow to convective heat transfer is studied. The inlet velocity is assigned appropriately to ensure a reasonable adaptation of fluid field and to avoid un-physical compressible effect. The results of numerical simulation demonstrate that the oscillating blade induces a force oscillation to the flow and the

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26

Chu, Hung-Chieh 1979. "Numerical Simulation of Flow and Heat Transfer in Internal Multi-Pass Cooling Channel within Gas Turbine Blade." Thesis, 2012. http://hdl.handle.net/1969.1/148242.

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Results from numerical simulation were performed to study flow and heat transfer in two types of rotating multi-pass cooling channels. Second moment closure model was used to solve flow in domain generated from Chimera method. The first type was a four-pass channel with two different inlet settings. The main flowing channel was rectangular channel (AR=2:1) with hydraulic diameter (Dh ) equals to 2/3 inch (16.9 mm). The first and fourth channel were set as different aspect ratio (AR=2:1; AR=1:1). Reynolds number (Re) used in this part was 10,000. The rotating angle was set as 90 degrees. The d

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27

KUMAR, MANISH. "SIMULATION OF FLOW AND HEAT TRANSFER IN A CHANNEL WITH RECTANGULAR VORTEX GENERATORS AT DIFFERENT REYONALD NUMBERS AND BLADE ANGLES." Thesis, 2015. http://dspace.dtu.ac.in:8080/jspui/handle/repository/15556.

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The compact heat exchanger is widely used in fields such as automobile industry, heating and air conditioning, power system, chemical engineering, electronic chip cooling and aerospace, etc. The subject of heat transfer enhancement is of significant interest in developing compact heat exchanger to meet the desire of high efficiency and low cost with the volume as small as possible and the weight as light as possible. The use of ribs/baffles placing in the cooling channels or channel heat exchangers is one of the commonly used passive heat transfer enhancement technique in single-phase in

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28

Lei, Jiang 1980. "Heat Transfer in Rectangular Channels (AR=2:1) of the Gas Turbine Blade at High Rotation Numbers." Thesis, 2011. http://hdl.handle.net/1969.1/150950.

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Gas turbine blade/vane cooling is obtained by circulating the high pressure air from compressor to the internal cooling passage of the blade/vane. Heat transfer and cooling effect in the rotating blade is highly affected by rotation. The typical rotation number for the aircraft engine is in the range of 0~0.25 and for the land based power generation turbine in the range of 0~05. Currently, the heat transfer data at high rotation numbers are limited. Besides, the investigation of heat transfer phenomena in the turn region, especially near hub portion is rare. This dissertation is to study the h

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29

Rahimian, M. "Assessing the performance of horizontal axis marine current turbines : the impact of evaluation methods and inflow parameters." Thesis, 2018. https://eprints.utas.edu.au/30217/1/Rahimian_whole_thesis_ex_pub_mat.pdf.

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The oceans offer a considerable sustainable energy resource in the form of wave, marine currents and thermal energy and provide a potential alternative to fossil fuels. Marine current, or tidal, energy can be harnessed using horizontal axis marine current turbines (HAMCTs). In this work, the performance of a 2-bladed HAMCT was extensively investigated using experimental, theoretical and numerical models under different flow conditions. The motivation behind the study was to assess the influence of various parameters, associated with an evaluation method and those involved in the environment of

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30

Chih, Sung Kuei, and 宋奎志. "Heat Transfer in Rectangle Channels with Bleeds Cooling Applications to Static Turbine Blade." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/94718260598407395469.

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碩士<br>國立高雄海洋科技大學<br>輪機工程研究所<br>95<br>An infrared imaging system is used to measure detailed contours of local heat transfer coefficient from twenty narrow rectangular channels with two opposite walls roughened by 450 staggered ribs with and without bleeds. Nusselt number（Nu） contours over the ribbed surfaces are presented for five sets of channels with an identical rib-floor configuration but different channel heights where the complex Nu distributions without bleed and then with bleeds from the scanned rib floor or from the ribbed wall opposite to the scanned rib floor or from the smooth side

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31

Teng, Chih-Hung, and 鄧志宏. "Comparison of turbulence models in simulating flow channel of gas turbine blades." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/y25vv4.

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碩士<br>國立臺灣海洋大學<br>輪機工程學系<br>104<br>Gas Turbines are widely used for airplane propulsion, land-base power generation and other industrial applications, such as trains, marines, cars, etc. To satisfy the fast development of advanced gas turbines, the operating temperature must be increased to improve the thermal efficiency and output work of the gas turbine engine. However, the heat transferred to the turbine blade is substantially increased as the turbine inlet temperature is continuously increased. Thus, it is very important to cool the turbine blades for a long durability and safe operation.

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32

Huh, Michael. "Heat Transfer in Smooth and Ribbed Rectangular Two-Pass Channels with a Developing Flow Entrance at High Rotation Numbers." 2009. http://hdl.handle.net/1969.1/ETD-TAMU-2009-08-831.

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Cooling channels with a developing flow entrance condition and aspect ratios of 1:4 and 2:1 were studied. The range of the rotation number and buoyancy parameter for the selected AR channels was extended. The maximum Ro and Bo for the 1:4 channel was 0.67 and 1.9, respectively. For the 2:1 channel, these values were 0.45 and 0.85, respectively. The effect of rib spacing and rib height on heat transfer in the 1:4 channel is investigated. Three rib spacing configurations were considered: P/e=2.5, 5, 10 with a constant e/Dh ratio of 0.078. To investigate the effect of rib height, a rib configurat

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33

Okafor, Chioma U. "BIOTIC RESPONSE TO PALEOCEANOGRAPHIC CHANGES IN THE MIDDLE EOCENE OF BLAKE NOSE, WESTERN NORTH ATLANTIC." Thesis, 2009. http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-420.

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Geochemical proxy records of sea surface environmental conditions at Blake Nose indicate short-term high amplitude variations. In order to investigate the response of calcareous nannoplankton to these short-term sea-surface environmental changes, we developed a high-resolution Eocene planktonic foraminifera Mg/Ca record and calcareous nannofossil absolute abundance record for ODP Site 1052 spanning the late middle Eocene (37.85 to 37.45 Ma). These data enable direct comparison of the absolute nannofossil abundance data to geochemical paleoenvironmental proxies (Mg/Ca, ?18O and ?13C) to determi

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34

Pritchett, John W., and Sabodh K. Garg. "EFFECT OF CHANGES IN SEAFLOOR TEMPERATURE AND SEA-LEVEL ON GAS HYDRATE STABILITY." 2008. http://hdl.handle.net/2429/1033.

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We have developed a one-dimensional numerical computer model (simulator) to describe methane hydrate formation, decomposition, reformation, and distribution with depth below the seafloor in the marine environment. The simulator was used to model hydrate distributions at Blake Ridge (Site 997) and Hydrate Ridge (Site 1249). The numerical models for the two sites were conditioned by matching the sulfate, chlorinity, and hydrate distribution measurements. The constrained models were then used to investigate the effect of changes in seafloor temperature and sea-level on gas hydrate stability. For

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