Дисертації з теми "Turbine blade development"
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Jousselin, Olivier. "Development of blade tip timing techniques in turbo machinery." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/development-of-blade-tip-timing-techniques-in-turbo-machinery(da682144-7009-4cdc-8f52-ff7cd0cf1cf1).html.
Повний текст джерелаCaraballo, Torrealba Edgar Jesus. "Modeling and Control Development for a Turbine Blade Testing Facility." Miami University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=miami1574434292454319.
Повний текст джерелаGorle, Jagan Mohan Rao. "Development of Circulation Controlled Blade Pitching Laws for Low-Velocity Darrieus Turbine." Thesis, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2015. http://www.theses.fr/2015ESMA0021/document.
Повний текст джерелаWith key applications in marine renewable energy. the vertical axis water turbine can use current or tidal energy in an eco-friendly manner. However, it is difficult to reconcile optimal performance of hydrokinetic turbines and compliance wilh the aquatic environment as the main drawback of the turbines is the formation of non-linear flow structures caused by the unsteady movement of the blades. Eddies in the flow are advected and can interact with other blades, which leads to a reduction in power output. To limit this phenomenon, the turbines operate at high speeds, which are likely to reduce the shaft power. High speeds of rotational so forbid the passage of aquatic animais, and are the cause of a suction effect on the sediments.The objective of this thesis work is twofold. First, it aims to develop a blade pitch control to get the flow adjusted around the blade profile at any given flow configuration by incorporatin.g the profile's motion with respect to incident flow. Such a system intends to achieve the objective of operating at reduced speeds without vortical releases, which should allow achieving a high torque without causing damage to the environment.This thesis work is mainly carried out in three phases. ln the first phase, the irrotational flow over an arbitrary profile is formulated using conforma] mapping. Prospective potential flow application on the basis of Couchet theory (1976) is involved in the development of a control law that decides the blade pitching in a constant circulation framework. In the second phase, a numerical validation of the developed analytical work is presented using CFD to examine how the theoretical fomulation can be effectively applied to Darricus turbines. In the final phase, two prototypes are developed, one is classical Darrieus turbine with fixed blades, and other is the turbine with pitching blades for experimental measurements of performance as well as flow fields(by PIV) in order to validate the computational results
Bai, Qian. "Development of a new process to reduce distortion in gas turbine blade forging." Thesis, Imperial College London, 2012. http://hdl.handle.net/10044/1/39131.
Повний текст джерелаCigeroglu, Ender. "Development of microslip friction models and forced response prediction methods for frictionally constrained turbine blades." Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1181856489.
Повний текст джерелаGuo, Shengmin. "Heat transfer and aerodynamic studies of a nozzle guide vane and the development of new heat transfer gauges." Thesis, University of Oxford, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389217.
Повний текст джерелаJiang, 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.
Повний текст джерелаLynch, 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.
Повний текст джерелаPh. D.
Sahay, Prateek. "Development of a Robotic Cell for Removal of Tabs from Jet Engine Turbine Blade." University of Cincinnati / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1574417686354007.
Повний текст джерелаALINEJAD, FARHAD. "Development of advanced criteria for blade root design and optimization." Doctoral thesis, Politecnico di Torino, 2018. http://hdl.handle.net/11583/2711560.
Повний текст джерелаDyachuk, Eduard. "Aerodynamics of Vertical Axis Wind Turbines : Development of Simulation Tools and Experiments." Doctoral thesis, Uppsala universitet, Elektricitetslära, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-260573.
Повний текст джерелаDen, Heijer Francois Malan. "Development of an active pitch control system for wind turbines / F.M. den Heijer." Thesis, North-West University, 2008. http://hdl.handle.net/10394/2635.
Повний текст джерелаThesis (M.Ing. (Mechanical Engineering))--North-West University, Potchefstroom Campus, 2009.
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.
Повний текст джерелаJami, Valentina. "Development of Computer Program for Wind Resource Assessment, Rotor Design and Rotor Performance." Wright State University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=wright1513703072278665.
Повний текст джерелаPeters, David W. "Tip leakage loss development in a linear turbine cascade." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-09052009-040444/.
Повний текст джерелаZaccaria, Michael A. "Development of a transonic turbine cascade facility." Thesis, Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/53201.
Повний текст джерелаMaster of Science
Joyce, Bryan Steven. "Development of an Electromagnetic Energy Harvester for Monitoring Wind Turbine Blades." Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/36354.
Повний текст джерелаMaster of Science
Meehan, Edward Charles. "Development of embedded sensors for structural health monitoring of wind turbine blades." Thesis, Montana State University, 2012. http://etd.lib.montana.edu/etd/2012/meehan/MeehanE1212.pdf.
Повний текст джерелаWilson, Amanda C. "Equivalent initial flaw size model development for turbine blades using in-service data." Thesis, Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/20006.
Повний текст джерелаEveritt, Stewart. "Developments in advanced high temperature disc and blade materials for aero-engine gas turbine applications." Thesis, University of Southampton, 2012. https://eprints.soton.ac.uk/348897/.
Повний текст джерелаLane, Christopher John Leslie. "The development of a 2D ultrasonic array inspection for single crystal turbine blades." Thesis, University of Bristol, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.651312.
Повний текст джерелаDoorly, Jane E. "The development of a heat transfer measurement technique for application to rotating turbine blades." Thesis, University of Oxford, 1985. http://ora.ox.ac.uk/objects/uuid:36bbf5b6-8978-4aae-920e-06ce0b96194e.
Повний текст джерелаHu, Dawei. "Development of the epoxy composite complex permittivity and its application in wind turbine blades." Thesis, Queen Mary, University of London, 2010. http://qmro.qmul.ac.uk/xmlui/handle/123456789/540.
Повний текст джерелаAl-Qabandi, Osama. "Development of cost effective polymer composites for wind turbine blades with improved mechanical properties." Thesis, Glasgow Caledonian University, 2016. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.700991.
Повний текст джерелаSaint-Marc, Jean-Charles. "Development of a ballistic hybrid fabric model for aeroengine fan blade containment application." Thesis, Université Laval, 2012. http://www.theses.ulaval.ca/2012/28630/28630.pdf.
Повний текст джерелаThis thesis presents the work that has been carried out inside the Mechanical Engineering Department of Laval University within a CRIAQ project related to Impact Modeling of Composite Aircraft Structure (IMCAS). The main goal of this work was to develop a dry fabric model for ballistic impact application and to implement it into a shell element capable of reproducing the dynamic behavior of a yarn crossover point with due account of some specific geometric and material parameters. The development of a material user subroutine (VUMAT user subroutine) was necessary to carry out this project. The methodology employed for the development of the user subroutine to be used with the S4R shell element available in Abaqus is based upon the works of Grujicic et al (1) and Shahkarami et al (2). The validity of the mesomechanical model created was carried out in order to assess the accuracy of its behavior under elementary loadings. Subsequently, using the same parameters to set up the analysis, the developed model has been applied in simple impact problems in Abaqus to demonstrate that we are able to obtain the same results as in the work of Shahkarami (2) used as a reference. Finally, after this last validation, the model is used in the impact study of an aeronautical engine’s fan blade containment problem using a hybrid casing. In our problem the casing’s inner shell is metallic and multiple Kevlar fabric layers are wrapped around it to contribute to the energy absorption and containment of the fan blade debris released outward at high speed. In this thesis all the assumptions, process and tools necessary to carry out every analysis have been described in details. Our results demonstrate that it is possible to capture the physical phenomenon happening at the yarn’s mesoscopic level during a high-velocity impact on a dry fabric while minimizing the computation time.
Charles, Amal Prashanth, and Taylor Claudio Alexander Gonzalez. "Development of a Method to Repair Gas Turbine Blades using Electron Beam Melting Additive Manufacturing Technology." Thesis, KTH, Industriell produktion, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-202367.
Повний текст джерелаYun, Jinsik. "Development of Structural Health Monitoring Systems Incorporating Acoustic Emission Detection for Spacecraft and Wind Turbine Blades." Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/42507.
Повний текст джерелаMaster of Science
Raza, Mohsin. "Process development for investment casting of thin-walled components : Manufacturing of light weight components." Licentiate thesis, Mälardalens högskola, Innovation och produktrealisering, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-27807.
Повний текст джерелаUtada, Satoshi. "Effect of a Prior Plastic Deformation during Heat Treatments on the Mechanical Properties of Ni-Based Superalloys for Turbine Blade Application Evolution of superalloy for turbine airfoil and development of recycling technology Platinum containing new generation nickel-based superalloy for single crystalline application Tensile, low cycle fatigue and very high cycle fatigue characterizations of advanced single crystal nickel-based superalloys Creep Property and Phase Stability of Sulfur-Doped Ni-Base Single-Crystal Superalloys and Effectiveness of CaO Desulfurization Evaluation and comparison of damage accumulation mechanisms during non-isothermal creep of cast Ni-based superalloys." Thesis, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2020. http://www.theses.fr/2020ESMA0019.
Повний текст джерелаNi-based single crystal (SX) superalloys are used for turbine blade applications because of their high-temperature durability. During the production of a turbine blade, unexpected plastic deformation (PD) can be introduced to the material. In this study, SX materials were pre-deformed in between solution and aging heat treatments to mimic PD during production. Mechanical tests on the pre-deformed materials have been performed to understand the effect of the prior PD.During aging treatments of pre-deformed AM1 SX superalloy, faster coarsening of γ′ precipitates and enhanced void nucleation were observed in the vicinity of slip bands which were introduced by PD at room-temperature. During creep deformation of pre-deformed AM1 at high temperature/low stress conditions (≥ 950 °C), the microstructure coarsened bands act as diffusion induced creep damage accumulating paths, further triggering recrystallization and resulting in drastic reduction of creep properties. At low temperature/high stress conditions (≤ 850 °C), microstructure shearing was facilitated in the microstructure coarsened band and it decreased creep properties. Recrystallization was not observed at lower temperature creep because the diffusion damage was suppressed. These relationships have been explained by creep tests on pre-deformed materials prepared by different pre-deformation temperatures and heat treatment procedures.CMSX-4 Plus SX superalloy was tested similarly to AM1 to understand the effect of the chemical composition. Effect of pre-deformation on alloy’s microstructure was mild in CMSX-4 Plus compared to that in AM1. Therefore, the predeformation did no exhibit large creep life debit in CMSX-4 Plus at temperatures lower than 1050 °C. However, during creep of CMSX-4 Plus at 1150 °C, pre-deformation presented huge impact on creep life and ductility by the same mechanisms as the ones observed for AM1 at 1050 °C.In order to restore properties of pre-deformed SX superalloys, rejuvenation heat treatment was added after PD.Rejuvenation treatment successfully restored microstructure after PD at room-temperature, and creep properties of rejuvenated specimens were shown to be equivalent to that of original AM1 and CMSX-4 Plus without PD
Charlesworth, Chris. "Ultrasonic phased array testing in the power generation industry : novel wedge development for the inspection of steam turbine blades roots." Thesis, University of Warwick, 2011. http://wrap.warwick.ac.uk/49401/.
Повний текст джерелаAzmi, Mohd Shahrul Nizam. "Development of a strain gauge for monitoring system that can be applied to wind turbine blades stress testing in the laboratory." Thesis, Azmi, Mohd Shahrul Nizam (2018) Development of a strain gauge for monitoring system that can be applied to wind turbine blades stress testing in the laboratory. Honours thesis, Murdoch University, 2018. https://researchrepository.murdoch.edu.au/id/eprint/41904/.
Повний текст джерелаYu, Luo Sheng, and 羅勝禹. "Development of Small Vertical Axis Wind Turbine Blade." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/44296369380828706717.
Повний текст джерела建國科技大學
機械工程系暨製造科技研究所
101
A small vertical axis wind turbine (SVAWT) with lift-type and drag-type blades were designed and tested in this paper. In order to improve the performance of the SVAWT with low start up wind speed, the struts connecting lift-type blades and rotating axis were designed as drag-type blades. The cross section of lift-type blades using in the SVAWT was NACA0018 for maintaining the rotating speed under higher wind speed. The parts of the SVAWT including blades and struts were designed by computer-aided design software and manufactured with the aid of computer-aided manufacturing, rapid prototyping and rapid tooling. The SVAWT was tested in a wind tunnel with the wind speed ranging from 2 to 7 m/sec. The test results containing rotating speed and torque were recorded to evaluate the performance of the SVAWT. The results showed that the drag-type blade could start up the SVAWT wind low speed, but would reduce the rotating speed under higher wind speed.
LI, YUN-LIN, and 李運霖. "Study on Wind Turbine Blade Models Development and Reality Fabrication." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/m8xb6j.
Повний текст джерела建國科技大學
電機工程系暨研究所
105
ABSTRACT The global wind power systems at present include two main types: (1) horizontal axis wind turbine (HAWT) system, and (2) vertical axis wind turbine (VAWT) system. This paper studied on wind blade models development and reality manufacture. First, the researcher collected and read related literature of wind power systems. Second, the researcher studied on HAWT blade (including one traditional model and eight innovative models) and VAWT blade (including one traditional model and eight innovative models), and adopted the methodologies of Bionics and TRIZ to innovate. There are three VAWT blades used TRIZ theory, eight HAWT blades and five VAWT blades used Bionics. Third, the researcher used 3D direct modeling software (e.g. SpaceClaim, SolidWorks and AutoCAD) to draw the figures, and used RP 3D printer (FORTUS 360mc) to manufacture the wind blade models. Fourth, the researcher also used an experiment device (WINDTRAINER) to propel and measure the voltages, currents of the wind blade models, adjusted the wind speed (4 m/s~12 m/s), compared their watts (Pa) and rotor power coefficient (Cp). Thus, the researcher can find the higher efficient wind blades of HAWT and VAWT types. The researcher found the best Cp value of HAWT blade is Bentley type, the better Cp value is four-leaved clover type; and the best Cp value of VAWT blade is Tai-Chi spiral type, the better CP value is Taiwan shape type. The other, the better Cp value of commercial advertisement for attracting the customers are Bentley type and Taiwan shape type. The baseball set shape wind blade is quite attractive, but its Cp value needs to be improved. These customer oriented innovative wind blades are designed to go beyond the thinking of the traditional wind blade models. The next, in the area of reality manufacture, we purchased and installed one 300W type VAWT power system (including an arc type blade, a Spiral type blade, a generator, a cylinder about 3 meters in height, a controller, two batteries, and a load of LED streetlamp). We used one PC and its monitor package to test and analyze this system functions. The wind power system got more watts (Pa) during the winter in 2014 typhoon Soudelor and typhoon Dujuan and the winter in 2015,and typhoon Nepartak and the winter in 2016. Finally, this research result is valuable in teaching and R&D of wind power generation. Furthermore, we use these innovative wind blades to take part in some international invention exhibitions and won some prize that can win the honor for CTU.
Yanto, Harki Apri, and 王子綜. "Development of the Multi-Blade, Drag-Type, Vertical Axis Wind Turbine." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/z48ucv.
Повний текст джерела國立臺灣科技大學
機械工程系
102
In this study, the development of a light-weight, simple design, and high economic value multi-blade, drag-type, vertical-axis wind turbine (MVAWT) is carried out by combining the design, mathematical model, computational fluid dynamic, fabricating, and experimental means as a complete research scheme. At first, the design process is approached by the evidence of a huge amount of negative drag force during the upwind condition for the drag-type, vertical-axis wind turbine. An automatic blade-flipping mechanism design is developed with the purpose to minimize the drag force on the upwind condition. Followed by that, fabrication and installation of a full-scale small size MVAWT is conducted to observe the functional of blade flipping mechanism and the wind turbine performance. The complete experimental work follows the IEC61400-12 standard procedure for ensuring the accurate experimental data. Besides, an electric generator, off-line loading system, meteorology mast system, and real-time data acquisition system (DAQ) are installed as a sophisticated wind turbine measuring system, where all environmental information and power data from sensors and generator on the platform are recorded and transferred to the computer automatically. Afterwards, the data processing and in-depth analysis on the experimental outcomes are executed via the established computer program. Consequently, the on-site performance of wind turbine/generator system is attained in an automatic and systematic manner. Moreover, for providing sufficient data and its accuracy, statistic concept is enforced to judge whether the test data are appropriate for considering in the data-processing procedure. Also, mathematic model and CFD simulation are conducted to estimate the torque distribution and flow characteristics during the operation of MVAWT. By focusing on the flow interaction around the blade, it can be concluded that the autonomous blade-flipping mechanism generate several important phenomenon, such as less drag force during the upwind condition, a sufficient thrust force to gain torque during the operation in low wind speed. In summary, combine with experimental data and numerical simulation results, this systematic and rigorous study on MVAWT is presented and can be served as a stepping stone for executing the R&D in harvesting wind energy as an alternative energy source.
Epaarachchi, Jayantha Ananda. "The development and testing of a new fatigue life procedure for small composite wind turbine blades incorporating new empirical fatigue life prediction and damage accumulation models for glass fibre reinforced plastics." Thesis, 2002. http://hdl.handle.net/1959.13/1312474.
Повний текст джерелаThe work in this thesis is concerned with developing a suitable fatigue life evaluation procedure for the blades of small wind turbines. Detailed strain gauge measurements from the blade of an operating 2.5m long composite-constructed blade were used to establish a relationship between upstream wind speed and blade response. A blade fatigue test procedure has been developed using historical wind data and the wind speed/blade response relationship; a detailed description of the methodology and procedure used is documented in this thesis. Existing empirical models to determine the fatigue life of glass-fibre reinforced composites were found to be inadequate for composite-constructed small wind turbine blades as they do not adequately address the effects of load frequency and stress ratio, and cannot be easily extended to address cumulative fatigue life calculations. A model has been developed which overcame these limitations, an is detailed in this thesis. A fatigue test rig has been designed and built to test blades 2.5m in length and has been used successfully to evaluate the fatigue life of a composite blade using the developed fatigue test procedure. The Wind Energy Group at the University of Newcastle had a 5kW prototype wind turbine at Fort Scratchley, Newcastle. Here one of the turbine's composite blades was instrumented with strain gauges with signals acquired simultaneously with those representing wind speed and direction, turbine direction and turbine generator power. Results show that the blade does not respond instantaneously to all changed in wind speed but follows the wind profile. A detailed finite element model of this blade was solved for load due to aerodynamic pressures and blade rotation. Predictions from the model were found to be in good agreement with the measurements. Comprehensive meteorological data were obtained through the Australian Bureau of Meteorology for 18 sites. Here the maximum and mean wind speeds were presented for a 30 minuted time increment with data acquired and averaged over a 10 minute time period in each increment with data acquired and averaged over a 10 minuted time period in each increment. This wind data was found to fit to a Weibull distribution. The data were also rainflow counted to isolate blade fatigue cycles. The detailed wind data acquired at 0.5Hz rate from the turbine test site at Fort Scratchley were also rainflow counted to determine the blade fatigue cycles in 10 minute sampling periods. From these data, a relationship between the average and maximum wind velocity and the number of wind cycles was determined. A method has been developed, and is detailed in this thesis, to determine all likely blade loading cycles using the Bureau's data and the Fort Scratchley data. The worst-case yearly fatigue loading spectrum was determined to have a total of 1803705 cycles representing stress levels for wind velocities between 1 m/s to 20 m/s and binned under stress ratios between 0 and 0.9 inclusive. This loading cycle was used to test the 2.5m composite. An empirical model for the fatigue life of glass-fibre reinforced plastic composites under various stress ratios and loading frequencies has been proposed. The model has been tested with fatigue test data from the literature as well as from various research laboratories. The model shows close agreement to all test data. This model was extended to predict cumulative fatigue damage and to overcome limitations of traditional cumulative fatigue rules such as Miner's rule. Predictions from this cumulative fatigue model were in good agreement with cumulative fatigue data obtained from the literature and the results of experiments performed by the author. The fatigue properties for the composite materials used in the wind turbine blade were determined from standard fatigue tests. Using a minimal about of experimental fatigue data, the proposed fatigue life of the blade for any loading spectrum. This cumulative fatigue model was found to perform better than traditional cumulative fatigue models. A mechanically operated test rig where the load on the blade was applied through a crank-level mechanism has been designed and built to test the 2.5m long wind turbine blades using the developed load spectrum. This test rig can apply blade loading at a maximum frequency of around 3Hz. Fatigue testing of the 2.5m composite blade shows that the material's properties continuously degradation with time. Predictions of blade fatigue life using material properties based on uni-axial fatigue data were found to be significantly lower than those based on flexural fatigue data. This disparity was found to be due to the difference between the stress state of the blade's critical section under full scale fatigue test conditions and the stress state under standard fatigue test conditions. Furthermore it was analytically shown that the blade's life span predictions were unaffected by the loading sequence.
Jian-Yung, Kao, and 高建勇. "The development of an automatic image system for turbine blade defects inspection." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/47052946531734384666.
Повний текст джерелаKai-ChingChou and 周塏晉. "Development of blade & tower structure and monitoring system for the 1KW wind turbine." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/63452927411097686187.
Повний текст джерелаAbdelrahman, Ahmed. "Development of a Wind Turbine Test Rig and Rotor for Trailing Edge Flap Investigation." Thesis, 2014. http://hdl.handle.net/10012/8454.
Повний текст джерелаCASTORRINI, ALESSIO. "Development of CAE tools for fluid-structure interaction and erosion in turbomachinery virtual prototyping." Doctoral thesis, 2017. http://hdl.handle.net/11573/940503.
Повний текст джерелаSharath, S. "Supercritical CO2 Power Cycles and Turbomachinery Development for Renewable Energy and Waste Heat Recovery." Thesis, 2021. https://etd.iisc.ac.in/handle/2005/5553.
Повний текст джерелаkuveya, Khanyisile Rose. "A study towards the development of the laser shock peening technology for an Eskom power station low pressure steam turbine blade application. To also compare the impact of laser shock peening without coating against shot peening treatment on 12%Cr steel." Thesis, 2018. https://hdl.handle.net/10539/26784.
Повний текст джерелаThe root section of a turbine blade is the most critical part as it forms the structural bond of the turbine blade to the shaft. If not maintained correctly the blade could fail catastrophically due to high and low cycle fatigue, stress corrosion cracking as well as corrosion fatigue. The sources of loading on the blades vary from normal operation, excitation of natural frequencies during transient occasions and overloads during statutory testing. Different surface modification technologies can be put in place to improve blades in-service performance. The present study is aimed at comparing previous results achieved from Shot Peening (SP) of an equivalent turbine blade to those achieved by Laser Shock Peening without coating (LSPwC).The SP data which is used for comparison is from the work and study done to optimise the SP of a 12Cr steel steam turbine blade. It is expected that LSPwC processing of the blade will result in a reduction in mean surface roughness (Ra), and deeper compressive residual stresses than the conventional SP processing. The focus of this investigation is also to determine the effects of LSPwC laser and processing parameters, such as laser intensity, laser spot size, coverage, water layer, and possibly laser wavelength on the X12CrNiMo12 high strength steel target material. Segments of an ex-service turbine blade, 20x20mm by 10mm thickness, processed at the CSIR National Laser Centre under various LSPwC parameters were analysed as follows: composition properties confirmed by spark tests; surface integrity assessed by SEM and 3D roughness mapping; microstructure; residual stress measurements by laboratory X-ray Diffraction. The experimental results helped in optimizing the LSPwC parameters for the X12CrNiMo12, before applying LSPwC to the more complex geometry of the blade root. This study then allowed for the determination of which peening process is most suited for turbine components.
XL2019
Huang, Yu-Jen, and 黃裕仁. "Development of Control System of Hydraulic Testing Facility of Wind Turbine Blades." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/94548727769951019991.
Повний текст джерела大葉大學
機械工程研究所碩士班
94
The reserve of petroleum decreases gradually. The development of alternative energies is the most important topic internationally. Among alternative energies, the wind power is the most promising one. The power generating efficiency of a wind turbine depends on aerodynamic characteristics of its blades. Also, the serve life of blades affects the overall cost of power generated. Therefore, structure tests of blades to understand their behavior under loads become necessary. Hydraulic system has been used on lots of kinds of equipments generally. It has many advantages; such as it can provide greater strength and has smaller volume compared to other actuator systems. These advantages make the system become an essential part in industrial applications. In this study, we used a hydraulic system to provide loadings to a blade that simulate the actual wind loading on the blade during operations of a wind turbine. We developed a computer interface to the programmable logic controller that controls the hydraulic system, and then control several valves and hydraulic cylinders of the hydraulic power system to apply loadings to the blade. In the interface, we can control the hydraulic pressure, flow speed, cylinder position of the hydraulic system. An experimental setup for blade test of a 25 kW wind turbine system was designed and installed. Some limit load cases of the blade were also tested in this study.
Wang, Shih-Chun, and 王識鈞. "Design and Development of Precision Miniature Twin-bladed Ultra High-speed Air Turbine." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/71639867971690471148.
Повний текст джерела國立臺灣大學
機械工程學研究所
100
Research and development of this thesis is to investigate the performance and characteristics of precision miniature twin-bladed air turbines in an ultra-high-speed region. In order to improve the machining efficiency of ultra-precision and micro fabrication technology, a high speed spindle is essential for the miniature tools which widely applied in systems such as PCB drilling machines, micro fabrication machines, and dental handpieces, etc. To realize the performance in high speed region, the air driven turbine is verified to be more feasible than an electromagnetic actuator. Furthermore, the operational efficiency and quality of the high speed spindle are significantly influenced by the turbine impeller and its bearings, respectively. Through detailed configuration studies and performance analyses on diverse miniature turbine impellers, the efficiency-influential and quality-influential parameters have been derived. And based on optimization results, a novel type of twin-bladed impeller (TB-impeller) on air turbine, which consists of two parallel impellers with an angular offset, is developed. The offset twin impellers can efficiently and smoothly transform pneumatic energy into rotational energy. Therefore, steady driving force and less dynamic unbalance are easily achieved for reducing operational disturbances such as vibration, noise, and wear. By applying a finite element analytical method, the operational performance and quality of the new developed twin bladed impeller such as rotational speed, torque, vibration, and noise were analyzed for comprehending influences of the design parameters and the operational parameters. While the inlet diameter, the blade shape and its geometric parameters are the dominant design parameters; the inlet pressure ,mass flow rate, and the outlet pressure are the main operational parameters. Through the turbine impellers, the pneumatic energy can be transformed into operational energy in form of the flow field and the pressure distribution as well as the energy loss in form of turbulence. Also by integrating knowledge of production technology, a neat design of the turbine impellers suitable for automatic manufacturing processes is developed. And furthermore, through an elaborate layout of the flow guiding, a minimum rotational run-out can be effectively achieved without any complicate and costly machining processes. Consequently, it can significantly depress the stream noise and raise the operation lifetime of bearings. According to our experimental verification at the same inlet pressure, the free running speed, power efficiency, and torque of novel TB-impeller are 10 %, 10 %, and 15 % higher than traditional counterparts, respectively. And the stream noise can be reduced by 17 %. The developed miniature spindle with novel TB-impeller can efficiently realize high speed rotation with high free running speed, high torque, less vibration, and less noise. By its superior features, the developed twin-bladed impeller also broadens the application possibilities in high speed machining fields with high efficiency and fewer expenses.
Wen, Ren-Fang, and 溫仁方. "The Design, Development and Testing of Small Wind Turbine Blades Changeable Angle of attack." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/t69r5s.
Повний текст джерела明道大學
材料與能源工程學系碩士班
105
In order to improve the energy shortage and global warming issues, people work heart to create a lot of renewable energy, in many renewable energy project, the technology of Wind Turbine is mature and have good economic efficiency. Wind Power Device grows very fast in the world, since 1990, the average value of annual growth is 25%, it will be stable to grow in the future and be the most important of energy, the Carbon reduction policy is one of the goals in our country to evolve renewable energy. Large Wind Turbine is saturated in development of Wind energy using effectiveness, but medium-small Wind Turbine has a lot of space for development, in order to develop and popularize medium-small wind turbine to the people, that is our purpose. Our design is a variable-angle blades using Hook’s Law spring to change the angle, the max speed can be more large, in high speed, our Axis can make the blade-angle stable in rated revolution to protect Generator, this design can make the blade and Generator more durable, design Anti strong winds Blade, lower damage for Blade and Generator also make the repairing expensed and cost lower, study safety structure and well-power of Small Wind Turbine in different wind speed to develop simple mechanical device. During the research, there are many parameters, so our research use actual test to record the result, when we got preliminary result, we joined “2016National wind energy and marine energy creative practice competition” in National Taiwan Ocean University, we earn very precious experience, and then we keep working hard and get better, joined “2016National college production innovation implementation competition” in National Changhua University of Education, we got Outstanding Award, we also had been invited to “2016Best Source Energy Technology creative exhibition” in National Science and Technology Museum. Had many kind of development experience, our research designed the wind turbine have a lot of affirmation, we have do well in security protection mechanism of Wind Turbine in variable axis and spring, the security protection mechanism turn on successfully in 8m/s with K=0.9 spring, according to the derivation of lab data, we predict the security protection mechanism is working in 11m/s with K=1.0 spring, the blades speed increase and revolution keeps stable, keep generating electricity stably in rated revolution, we also upgrade the power range of Wind Turbine in the safety situation, giving the wind turbine a good innovation and development.
Yang, Chaochieh, and 楊超傑. "A Development Of Testing Platforms For Composite Blades Of Stackable Vertical Axis Wind Turbine." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/67646624781762042665.
Повний текст джерела大葉大學
工業工程與科技管理學系
100
We give careful consideration to energy development in Taiwan under the issues of energy shortage and environmental protection in today's world. Wind power has already become a great commercial value; it is cheap, clean and easy to be attained. However, the efficient executions of wind power and environmental protection policies have become the world's common goal. Wind turbines can be classified into two main categories, namely, horizontal axis and vertical axis wind turbines [HAWT and VAWT]. Especially for VAWT, it had no adequate engineering case to exploit and had no international standard to refer. Therefore, in according with the relevant IEC-61400 standards, it is development of clamping apparatus to test the composite blades in test platforms, and use engineering software (CAD/CAE) to support the design and experimental stage. In addition, it is effective to short the design cycle and reliability of simulated analysis. Finally, we are discussed the failure modes and test results of the SVAWT blades under different manufacturing processes to verify the proposed experimental setup methods and manufacture techniques of the SVAWT blades pass static test and fatigue test systems are performed, and established the fatigue life equation by fatigue theory can effectively prediction the life of SVAWT blades. The information of technology developed can be provided.
Lennie, Matthew. "Development of the QFEM Solver : The Development of Modal Analysis Code for Wind Turbine Blades in QBLADE." Thesis, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-132154.
Повний текст джерелаJheng, Jhih-Kai, and 鄭至凱. "Design and Development of Lightweight Wind Turbine Blades based on External Force-bearing Cables and Modular Structure." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/y786ud.
Повний текст джерела