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1

NADELLA, Venkata Raghurama Swaroop. "CFD Simulation of MQL with low temperature and high-pressure coolant." Thesis, KTH, Industriell produktion, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-244417.

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Att använda stora mängder skärvätskor vid en bearbetningsprocess har potentiellt negativ inverkan inte bara för operatören men också på miljön. Utöver detta tillkommer ökade kostnader för tillverkningsprocessen. För att minska skärvätskekonsumtionen under maskinbearbetning införs en teknik som kallas minimalsmörjning(MQL=Minimum Quantity Lubrication) som använder mycket mindre mängd skärvätska men ändå är effektivare än standard kylspolning med skärvätska. Denna avhandling fokuserar på att bestämma konvektionen över ett skär med en konstant värmekälla placerad inuti ett kvadratiskt hölje och b
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Montis, Marco [Verfasser]. "Aerodynamic Effects of Coolant Ejection in a High-Pressure Gas Turbine Airfoil / Marco Montis." München : Verlag Dr. Hut, 2018. http://d-nb.info/1168535212/34.

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3

Hort, Martin. "Technologické, ekonomické a ekologické aspekty obrábění s vysoce výkonným chlazením." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228838.

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The diploma thesis is aimed to the influence of the high-pressure and low-pressure coolant system according to the machining operation. The comparison was carried out with different types of materials and cutting tools using the main machining operations – turning, milling, and drilling. The study is focused on the chip and heat removal from the cutting zone, tools life and wear of the tools. A description of the basic principle of the high-pressure coolant system meant is described in this thesis. The economical analysis of the high-pressure compared to low-pressure system was determined in t
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Bonney, John. "High-speed machining of nickel-base, Inconel 718, alloy with ceramic and coated carbide cutting tools using conventional and high-pressure coolant supplies." Thesis, London South Bank University, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.410701.

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The first part of this study involve an evaluation of the performance of recently developed nano-grain size ceramic tool materials when machining nickel base, Inconel 718, with conventional coolant flow in terms of tool life, tool failure modes and wear mechanisms as well as component forces generated under different roughing conditions. Comparison tests were carried out with commercially available ceramic tool materials of micron-grain composition. The test results show that the micron grain size commercially available tool materials generally gave the longest tool life. The dominant failure
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Micaroni, Ricardo. "Influencia do fluido de corte sob pressão no torneamento do aço ABNT 1045." [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/265586.

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Orientador: Anselmo Eduardo Diniz<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica<br>Made available in DSpace on 2018-08-07T07:00:53Z (GMT). No. of bitstreams: 1 Micaroni_Ricardo_D.pdf: 2196403 bytes, checksum: 4db1f057fa92acc55a6677b56f01f72d (MD5) Previous issue date: 2006<br>Resumo: Na usinagem dos metais, a aplicação do fluido de corte otimizada é um recurso que pode aumentar a taxa de remoção de material. Dentre os beneficios pode-se citar a redução da temperatura da ferramenta e melhor formação dos cavacos. Na primeira fase deste trabalho foi e
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6

Tamil, Alagan Nageswaran. "Textured insert for improved heat extraction in combination with high-pressure cooling in turning of superalloys." Licentiate thesis, Högskolan Väst, Avdelningen för avverkande och additativa tillverkningsprocesser (AAT), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-11738.

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Heat generated in a machining process is a common and critical obstacle faced in today's machining industries. The heat generated in the cutting zone has a direct negative influence on the tool life which, in turn contributes to increase the manufacturing costs. Especially, in machining of Heat Resistant Super Alloys, HRSA this is a very limiting factor. HRSA are capable of retaining their mechanical strength and hardness at elevated temperatures. This property is advantageous in the application in e.g. aero-engines but also a disadvantage, since it also lowers the machinability significantly.
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Kanjirakkad, Vasudevan Parameswaran. "Passive shroud cooling in high pressure turbines." Thesis, University of Cambridge, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.615271.

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8

Cresci, Irene. "High pressure nozzle guide vane cooling system flow characteristics." Thesis, University of Oxford, 2016. http://ora.ox.ac.uk/objects/uuid:b8826eb5-f4ad-4fe8-8730-9134fd9fd183.

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The continuous demand from the airlines for reduced jet engine fuel consumption results in increasingly challenging high pressure turbine nozzle guide vane (NGV) working conditions. The capability to reproduce representative boundary conditions in a rig at the combustor-turbine interaction plane is a key feature when testing NGVs in an engine-representative environment. A large scale linear cascade rig to investigate NGV leading edge cooling systems has been designed with particular attention being paid to creating engine representative conditions at the NGV inlet plane. The combustor simulato
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Leigh, Stephen. "Laser drilling of cooling holes in high pressure turbine blades." Thesis, University of Manchester, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.706078.

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Romero, Hamers Adolfo. "STUDY OF THE THERMAL STRATIFICATION IN PWR REACTORS AND THE PTS (PRESSURIZED THERMAL SHOCK) PHENOMENON." Doctoral thesis, Editorial Universitat Politècnica de València, 2014. http://hdl.handle.net/10251/36536.

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In the event of hypothetical accident scenarios in PWR, emergency strategies have to be mapped out, in order to guarantee the reliable removal of decay heat from the reactor core, also in case of component breakdown. One essential passive heat removal mechanism is the reflux condensation cooling mode. This mode can appear for instance during a small break loss-of-coolant-accident (LOCA) or because of loss of residual heat removal (RHR) system during mid loop operation at plant outage after the reactor shutdown. In the scenario of a loss-of-coolant-accident (LOCA), which is caused by the leak
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11

Weber, Fabian. "Optical Analysis of the Hydrogen Cooling Film in High Pressure Combustion Chambers." Thesis, Luleå tekniska universitet, Rymdteknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-76872.

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For performance optimisation of modern liquid cryogenic bipropellant rocket combustion chambers, one component which plays an important role in reducing the wall side heat flux, is the behaviour of the cooling film. At the Institute of Space Propulsion of the German Aerospace Center (DLR) in Lampoldshausen, hot test runs have been performed using the experimental combustion chamber BKM, to investigate the wall side heat flux which is -- among other factors -- dependent on cooling film properties. To gain more insight into the film behaviour under real rocket-like conditions, optical diagnostic
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12

Ferguson, Derek. "The development of air-cooling techniques for fast response pressure transducers in high temperature environments." Thesis, Cranfield University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.387639.

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13

Giacomelli, Gene, and Kathryn Hahne. "Evaporative Cooling in Semi-Arid Climates." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2008. http://hdl.handle.net/10150/146294.

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2 pp.<br>In the semi-arid climate of southern AZ, evaporative cooling systems are commonly used and very effective for cooling homes (swamp coolers), outdoor areas (misters), and for greenhouses used for commercial and horticultural plant production (pad-and-fan, high-pressure-fog). The purpose of this brochure is to educate users about strategies they can employ to save water and improve the performance of evaporative cooling systems. Principles of operation, a list of advantages and disadvantages, and a comparison of common systems is also included, to help users decide the best system for
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14

Nickol, Jeremy B. "Airfoil, Platform, and Cooling Passage Measurements on a Rotating Transonic High-Pressure Turbine." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1459857581.

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15

Vosough, Manouchehr. "Effect of high-pressure cooling on the residual stress in Ti-Alloys during machining /." Luleå : Luleå University of Technology, 2005. http://epubl.luth.se/1402-1757/2005/46.

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16

Dahlqvist, Johan. "Cavity Purge Flows in High Pressure Turbines." Doctoral thesis, KTH, Kraft- och värmeteknologi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-218468.

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Turbomachinery forms the principal prime mover in the energy and aviation industries. Due to its size, improvements to this fleet of machines have the potential of significant impact on global emissions. Due to high gas temperatures in stationary gas turbines and jet engines, areas of flow mixing and cooling are identified to benefit from continued research. Here, sensitive areas are cooled through cold air injection, but with the cost of power to compress the coolant to appropriate pressure. Further, the injection itself reduces output due to mixing losses.A turbine testing facility is center
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17

Paravastu, Pattarabhiran Vijaya Raghava. "Experimental investigation of effects of coolant concentration on subcooled boiling and crud deposition on reactor cladding at high pressures and high temperatures." Thesis, Manhattan, Kan. : Kansas State University, 2008. http://hdl.handle.net/2097/1110.

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18

Zulkurnain, Musfirah. "Crystallization of Lipids under High Pressure for Food Texture Development." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1500557652861233.

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19

Kahveci, Harika Senem. "The Influence of Film Cooling and Inlet Temperature Profile on Heat Transfer for the Vane Row of a 1-1/2 Stage Transonic High-Pressure Turbine." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1284261128.

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20

Kirollos, Benjamin William Mounir. "Aerothermal optimisation of novel cooling schemes for high pressure components using combined theoretical, numerical and experimental techniques." Thesis, University of Oxford, 2015. https://ora.ox.ac.uk/objects/uuid:72168abd-48f7-49c6-a6ef-3d4a9f6cc6e9.

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The continuing maturation of metal laser-sintering technology has presented the opportunity to de-risk the engine design process by experimentally down-selecting high pressure nozzle guide vane (HPNGV) cooling designs using laboratory tests of laser-sintered - instead of cast - parts to assess thermal performance. Such tests are very promising as a reliable predictor of the thermal-paint-engine-test, which is used during certification to validate cooling system designs. In this thesis, conventionally cast and laser-sintered parts are compared in back-to-back experimental tests at engine-repres
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21

Kinc, Jiří. "Využití vysokotlakého chlazení na dlouhotočných automatech." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231129.

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The thesis describe high-pressure cooling system and present experiment, when is using this cooling technology for turning cylindrical workpiece to long-turn machines. Workpiece manufactured using high-pressure cooling system is compares with Workpiece manufactured using low-pressure cooling system. Results are analyzed, evaluated and plotted in a single graphical relationships. The thesis is completed the analysis, discussion and recommendations regarding the using of high-pressure cooling.
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22

Leung, Pak Wing. "Aerodynamic Loss Co-Relations and Flow- Field Investigations of a Transonic Film- Cooled Nozzle Guide Vane." Thesis, KTH, Kraft- och värmeteknologi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-162130.

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Over the last two decades, most developed countries have reached a consensus that greener energy production is necessary for the world, due to the climate changes and limited fossil fuel resources. More efficient turbine is desirable and can be archived by higher turbine-inlet temperature (TIT). However, it is difficult for nozzle guide vane (NGV), which is the first stage after combustion chamber, to withstand a very high temperature. Thus, cooling methods such as film cooling have to be implemented. Film-cooled NGV of an annular sector cascade (ASC) is studied in this thesis, for getting com
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23

Saha, Ranjan. "Aerodynamic Investigation of Leading Edge Contouring and External Cooling on a Transonic Turbine Vane." Doctoral thesis, KTH, Kraft- och värmeteknologi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-150458.

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Efficiency improvement in turbomachines is an important aspect in reducing the use of fossil-based fuel and thereby reducing carbon dioxide emissions in order to achieve a sustainable future. Gas turbines are mainly fossil-based turbomachines powering aviation and land-based power plants. In line with the present situation and the vision for the future, gas turbine engines will retain their central importance in coming decades. Though the world has made significant advancements in gas turbine technology development over past few decades, there are yet many design features remaining unexplored
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24

Casey, Timothy. "The aerodynamic losses with the addition of film cooling in a high-speed annular cascade." Honors in the Major Thesis, University of Central Florida, 2010. http://digital.library.ucf.edu/cdm/ref/collection/ETH/id/1375.

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This item is only available in print in the UCF Libraries. If this is your Honors Thesis, you can help us make it available online for use by researchers around the world by following the instructions on the distribution consent form at http://library.ucf.edu/Systems/DigitalInitiatives/DigitalCollections/InternetDistributionConsentAgreementForm.pdf You may also contact the project coordinator, Kerri Bottorff, at kerri.bottorff@ucf.edu for more information.<br>Bachelors<br>Engineering and Computer Science<br>Mechanical Engineering
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25

O'Dowd, Devin Owen. "Aero-thermal performance of transonic high-pressure turbine blade tips." Thesis, University of Oxford, 2010. http://ora.ox.ac.uk/objects/uuid:e7b8e7d0-4973-4757-b4df-415723e7562f.

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26

Crosby, Jared M. "Particle Size, Gas Temperature, and Impingement Cooling Effects on High Pressure Turbine Deposition in Land Based Gas Turbines from Various Synfuels." Diss., CLICK HERE for online access, 2007. http://contentdm.lib.byu.edu/ETD/image/etd1774.pdf.

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27

Mathison, Randall Melson. "Experimental and Computational Investigation of Inlet Temperature Profile and Cooling Effects on a One and One-Half Stage High-Pressure Turbine Operating at Design-Corrected Conditions." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1250281163.

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28

Saha, Ranjan. "Aerodynamic Investigations of a High Pressure Turbine Vane with Leading Edge Contouring at Endwall in a Transonic Annular Sector Cascade." Licentiate thesis, KTH, Kraft- och värmeteknologi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-92204.

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Efficiency improvement is an important aspect to reduce the use of fossil-based fuel in order to achieve a sustainable future. Gas turbines are mainly fossil-fuel based turbomachines, and, therefore, efficiency improvement is still the subject of many on-going research activities in the gas turbine community. This study is incorporated into a research project that investigates design possibilities of efficiency improvement at the high pressure turbine (HPT) stage. In the search for HPT-stage efficiency gains, leading edge (LE) contouring near the endwall is one of the methods found in the publ
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Van, der Merwe David-John. "Experimental and numerical investigation of the heat transfer between a high temperature reactor pressure vessel and the outside of the concrete confinement structure." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/71796.

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Thesis (MScEng)--Stellenbosch University, 2012.<br>ENGLISH ABSTRACT: A high temperature reactor (HTR) generates heat inside of the reactor core through nuclear fission, from where the heat is transferred through the core and heats up the reactor pressure vessel (RPV). The heat from the RPV is transported passively through the reactor cavity, where it is cooled by the reactor cavity cooling system (RCCS), through the concrete confinement structure and ultimately into the environment. The concrete confinement structure can withstand temperatures of up to 65°C for normal operating conditions
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Franceschelli, Luca. "Cooling Performance Analysis and Design of an Instrumented Radiator in a MotoGP Wind Tunnel Model." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.

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The present thesis work was developed in collaboration with the Ducati Corse Aerodynamic Department. It is focused on the measurement system employed on the MotoGP Wind Tunnel model in order to evaluate the cooling performances at the radiators. As first, an analysis of the current methodology is conducted. Based on the arrangement of hybrid-Kiel probes behind the radiators, it was observed that an improvement in the calibration procedure is required in order to account for inter-probe and support frame interference. Furthermore, a correlation process with the CFD simulation was carried out.
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31

Tavakoli, Shahab. "Modélisation du cycle thermique des moules de fonderie sous pression." Thesis, Paris 10, 2014. http://www.theses.fr/2014PA100095.

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La réduction de la masse des véhicules, notamment des Groupes Motopropulseurs contribue à la réduction des émissions polluantes. Aujourd’hui afin d’aboutir à cet objectif, la conception de pièces automobiles (Carter Mécanisme, Carter Cylindre) en matériau allégé tel que l’aluminium et ses alliages est en plein essor. Pour la production de grande série, ces alliages sont mis en œuvre par le procédé de fonderie ‘’Aluminium sous pression’’.Ce procédé utilise des moules métalliques. La maîtrise du comportement thermique du moule : chauffage, refroidissement interne (par circuit) et externe, est un
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32

Ferraro, Stefano. "Influence of trace elements on secondary die-cast aluminium alloys." Doctoral thesis, Università degli studi di Padova, 2014. http://hdl.handle.net/11577/3423822.

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Recycling play a key role on saving of natural resources and on reducing pollution. The recycling of aluminium alloys is also cost-effective, since it reduce the material cost and creates a considerable energy-saving. The use of recycled Al alloys (usually called secondary) has improved in recent years also because of their comparable mechanical properties with primary aluminium alloys. During the production of secondary aluminium alloys, the scrap are mixed regardless of their specific chemical composition, and then master alloys or pure elements are added to the molten metal. Furthermore,
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Villafañe, Roca Laura. "Experimental Aerothermal Performance of Turbofan Bypass Flow Heat Exchangers." Doctoral thesis, Universitat Politècnica de València, 2014. http://hdl.handle.net/10251/34774.

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The path to future aero-engines with more efficient engine architectures requires advanced thermal management technologies to handle the demand of refrigeration and lubrication. Oil systems, holding a double function as lubricant and coolant circuits, require supplemental cooling sources to the conventional fuel based cooling systems as the current oil thermal capacity becomes saturated with future engine developments. The present research focuses on air/oil coolers, which geometrical characteristics and location are designed to minimize aerodynamic effects while maximizing the the
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Dalibard, Jean. "Le rôle des fluctuations dans la dynamique d'un atome couple au champ électromagnétique." Paris 6, 1986. http://www.theses.fr/1986PA066393.

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Etude de la dynamique atomique interne; possibilité de séparer la contribution des fluctuations du vide et de la réaction du rayonnement pour differents processus radiatifs (émission spontanée, déplacement de Lamb, etc. ). Etude de la dynamique atomique externe en partant de l'analogie entre ce problème et celui du mouvement brownien; établissement d'une équation de Fokker-Planck-Kramers pour l'évolution de la fonction de Wigner atomique, avec termes de force stationnaire, force de frottement etc. Etude détaillée du mouvement atomique dans une onde laser stationnaire intense: refroidissement,
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Chang, Heng-Chi, and 張恒基. "Study of the influence of high-pressure cooling on machining mid-carbon steel." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/trg6fm.

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碩士<br>中原大學<br>機械工程研究所<br>105<br>Machine tools in the computer subsidies design and control after the emergence of significant progress, relying on computer computing can exclude many people caused by the impact of errors. However, the precision and yield of parts are well constrained by the physical phenomena. The scope of the influence includes the material of the workpiece, the type of the tool and the high temperature accompanying the cutting process. Which cutting the tool and the workpiece produced by the high temperature is troubled by the industry for a long time. In addition to the hig
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Wei-LunWang and 王偉倫. "The effects of high pressure air cooling and ultrasonic lubrication on the milling characteristics of tool steels." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/48199122846494101977.

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碩士<br>國立成功大學<br>機械工程學系碩博士班<br>98<br>This thesis discussed surface roughness and tool wear in milling tool steel material with different cutting fluid supply conditions. SKD11(HRc60) and SKD61(HRc40) were milled on the condition of high pressure air cooling and ultrasonic lubrication. The milling force was analyzed to identify both the cutting coefficients of shearing and plowing effects individually. The experiment results showed that less tool wear and better roughness of milling surface can be found on the condition of ultrasonic lubrication and less radial cutting depth. Even on the cond
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Sevastopolev, Ruslan. "Effect of conformal cooling in Additive Manufactured inserts on properties of high pressure die cast aluminum component." Thesis, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-50949.

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Additive manufacturing can bring several advantages in tooling applications especially hot working tooling as high pressure die casting. Printing of conformal cooling channels can lead to improved cooling and faster solidification, which, in turn, can possibly result in better quality of the cast part. However, few studies on advantages of additive manufactured tools in high pressure die casting are published.The aim of this study was to investigate and quantify the effect of conformal cooling on microstructure and mechanical properties of high pressure die cast aluminum alloy. Two tools each
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