Dissertations / Theses on the topic 'Blade channel'
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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.
Full textRicklick, 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.
Full textPh.D.
Department of Mechanical, Materials and Aerospace Engineering
Engineering and Computer Science
Mechanical Engineering PhD
Roclawski, Harald. "PIV Measurements of Channel Flow with Multiple Rib Arrangements." UKnowledge, 2001. http://uknowledge.uky.edu/gradschool_theses/303.
Full textBhattarai, 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.
Full textRupakula, 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.
Full textLiu, 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.
Full textWaidmann, 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.
Full textNagaiah, 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.
Full textPh.D.
Doctorate
Industrial Engineering and Management Systems
Engineering and Computer Science
Industrial Engineering
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.
Full textWaidmann, 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.
Full textParida, 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.
Full textPh. D.
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.
Full textEn matière de moteurs d'avion à turbine à gaz, une Température d'Entrée de Turbine (TET) aussi élevée que possible est souhaitée. Augmenter sa valeur permet en effet d'obtenir un rendement thermodynamique plus élevé tout en réduisant le rapport poids-poussée et la consommation spécifique (SFC). Parce que la TET maximum permise est liée aux limites de température supportées par les composants de la turbine, le choix des matériaux et la conception des circuits de refroidissement d'aubes sont cruciaux. Cette recherche rend compte d'une étude expérimentale et numérique sur les cavités internes de refroidissement d'aubes. Des sections de passage différentes sont examinées, en fonction de la région de l'aube à refroidir. Plusieurs paramètres en ce qui concerne les promoteurs de turbulence et les conditions de l'écoulement, sont variés pour définir une solution optimale en termes de transfert de chaleur et pertes de charges. Des simulations numériques sont réalisées pour appuyer l'analyse de l'écoulement. La comparaison de ces résultats avec les mesures aérodynamiques se révèle très satisfaisante. Enfin, des diagrammes sont proposés, pour décrire l'écoulement dans chaque cavité étudiée. De cette étude, il ressort une meilleure compréhension des phénomènes mis en jeu dans les cavités de refroidissement, ainsi qu'une base de données détaillée. Cette dernière est utile pour la validation de codes de calcul et l'optimisation des systèmes de refroidissement
Barbiero, Franck. "Antibrouillage de récepteur GNSS embarqué sur hélicoptère." Thesis, Toulouse, ISAE, 2014. http://www.theses.fr/2014ESAE0052.
Full textIn hostile environments, Global Navigation Satellite System (GNSS) can be disturbed by intentional jamming. Using antenna arrays, space-time adaptive algorithm (STAP) isone of the most efficient methods to deal with these threats. However, when a GNSS receiver is placed near rotating bodies, non-stationary effects called Rotor Blade Modulation (RBM) are created by the multipaths on the blades of the helicopter. They can degrade significantly the anti-jamming system and the signal of interest could belost. The work of the thesis is, consequently, to develop a GNSS protection system adapted to the RBM. In this way, an innovative multipath model, adapted to this phenomenon, has been developed. The model is then confirmed by comparison with a symptotic electromagnetic simulations and experiments conducted on an EC-120helicopter. Using a Maximum Likelihood algorithm, the parameters of the non-stationary part of the received signal have been estimated. And finally, the RBM anti-jamming solution, combining oblique projection algorithm and academic STAP, can mitigate dynamic and static contributions of interferences. In the end, the navigation information is available again
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.
Full textDuda, 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.
Full textDoussot, 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.
Full textHydraulic machines are designed to operate in flow conditions close to the best efficiency point. However, to respond to the increasing demand for flexibility mainly due to the integration of renewable energy in the electric grid, the operating range of Francis turbines has to be extended towards smaller discharge levels without restriction. When Francis turbines are operated typically between 30% and 60% of the rated output power, the flow field is characterized by the appearance of inter-blade vortices in the runner. At these off-design operating conditions and due to these phenomena, dynamic stresses level can increase, and potentially lead to fatigue damage of the mechanical structure of the machine. The objective of this study is to present investigations on the dynamic behaviour of the inter-blade vortices and their impact on the runner by using numerical simulations. Computations were performed with different turbulence modelling approaches to assess their relevance and reliability: Reynolds-Averaged Navier-Stokes (RANS), Scale-Adaptive Simulations (SAS) and Large-Eddy Simulations (LES). Steady simulations aimed to better understand the emergence condition of the inter-blade vortices. The analysis showed that vortices can be generated due to poor inlet adaptation at part load, however other vortices can also be due to a local backflow in the runner. The competition between these both phenomena leads to various topologies of the inter-blade vortices. The dynamic loading on the blade has to be known in order to evaluate the lifetime of the runner by mechanical analysis. Different operating conditions have been simulated by unsteady simulations to understand how the pressure fluctuations depend on the operating conditions. The localisation of the pressure fluctuations and their frequency signature have been analysed and compared to experimental measurements performed on a scaled model. The results of SAS simulations show the driving phenomena at a low range of frequencies of the dynamic of part load conditions. However the high frequency fluctuations are underestimated by this approach. Then large eddy simulations are computed to improve the prediction of this high frequency fluctuations. The study of a wide-band frequency signature is particularly detailed in this work
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.
Full textFarhadi, 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.
Full textSampath, 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.
Full textIbrahim, 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.
Full textRamirez, 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.
Full textKlíma, Petr. "Parní turbina rychloběžná kondenzační." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231803.
Full textLi, 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.
Full textYin-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.
Full text國立成功大學
航空太空工程學系碩博士班
100
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 thermal fields in the channel flow, such that the heat transfer rate could be enhanced for the heating cylinder. Five blade design parameters with respect to heating cylinder is considered, namely, the swing angle, the blade aspect ratio, the distance and relative location to heating cylinder and operation frequency. Results show that a larger swing angle, blade aspect ratio and swing frequency will lead to a better the enhancement of convective heat transfer. However, a good choice of distance and location of the blade can only be determined according to the inlet flow Reynolds number and the selected blade parameters.
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.
Full textLei, 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.
Full textChih, 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.
Full text國立高雄海洋科技大學
輪機工程研究所
95
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 sidewall are analyzed to examine the synergetic effects of variable channel heights and different bleed conditions on heat transfer. Spatially averaged heat transfer results for the entire set of test channels are generated with the thermal performance factors compared to establish the heat transfer correlations with applications to the design of coolant channels in a gas turbine blade.
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.
Full text國立臺灣海洋大學
輪機工程學系
104
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. Cooling the blade must cool the critical region that exposed to the hot gas, such as blade tip, passage, suction and pressure side of the blade surface. This paper use the software of several common and typical model in ANSYS® Fluent turbulence model, simulate and calculate the complex flow phenomena movement between the blade and vane, which take the general size of blade, and the temperature and pressure of inlet gas set 1673◦K and 1.5 atm for conducting the turbulence model. According to the results of the pressure and temperature field calculations, summarize, analyze and compare, description of each the model results. The results show, ANSYS® Fluent turbulence model can be divided into steady and unsteady models, and each model in the result of the calculation of the same blade geometry, although the same roughly, but on the critical region, such as blade tip, the surface of pressure side , the tail of suction side, etc., and still display a real operation state, show the similar temperature trends and pressure filed that can be referenced for blade design.
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.
Full textOkafor, 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.
Full textPritchett, 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.
Full text