Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 27 for “"Turbine Design"”.
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A Feasibility Study of a Tension-Leg Platform for Hydro-Powered Turbines System and Metocean Data Analysis for Floating Wind Turbine Design
… a Tension Leg Platform (TLP) for a hydropower turbine system with an overall rated power of 1500 kW. The TLP semi-submersible concept for harnessing ocean energy is an innovative approach, which allows the employment of turbines in deep waters near the water surface. The TLP's structural and …
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Investigation of Pulse Detonation Engine Flow Conditions for Turbomachinery Integration
… Integration of pressure gain combustors into gas turbine engines has been and still is one of the most important challenges facing the gas turbine industry. Pressure gain combustion devices are inherently unsteady. This unsteadiness affects turbomachinery components designed using steady operation …
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Design and testing of a concentrator wind turbine
… it suffers from the problem of dilution. Wind turbine designers naturally try to compensate for this by increasing the size of the rotor to capture more of the kinetic energy of the wind. A major constraint in conventional wind turbine design is the reduction in rotational speed as the size of …
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Multidisciplinary design optimization of dynamic systems using surrogate modeling approach
… for efficient solution of multi-disciplinary design optimization (MDO) of dynamic systems. Many of the MDO problems in dynamic systems design often involve computationally expensive system simulations, severely limiting their design optimization. This work demonstrates a novel method which …
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Probabilistic extreme response analysis of large wind turbines to natural winds
… increases in size and flexibility of modern wind turbines, especially for offshore applications, an improved understanding and assessment of turbine performance under various wind conditions is increasingly important to greatly reduce the risk and increase turbine efficiency and reliability. The …
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Analysis and design of a new updraft free-exit-flow low-head hydropower turbine system
… new updraft free-exit-flow low-head hydropower turbine system is designed to enhance tailrace water quality, to minimize fish mortality in turbine flow passage, to improve turbine mechanical performance, and to reduce costs and time of hydropower development. This study applies the theoretical, …
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Design, build and test of an axial flow hydrokinetic turbine with fatigue analysis
OpenProp is an open source propeller and turbine design and analysis code that has been in development since 2007 by MIT graduate students under the supervision of Professor Richard Kimball. In order to test the performance predictions of OpenProp for axial flow hydrokinetic turbines, a test …
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Offshore wind turbine nonlinear wave loads and their statistics
… of lateral flexible vibrations on offshore wind turbine foundations and the higher natural frequencies of the offshore wind turbine foundation relative to the dominant frequencies of the linear wave load model, the modeling of the dynamic behavior of the foundation under nonlinear wave loads and …
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The Influence of Yaw and Coning on Small Bio-Inspired Wind Turbines
… of low aspect ratio horizontal-axis wind turbine models. The tested coning angles (β) ranged from 5◦ to 25◦, and power and tip-speed ratio were measured at Reynolds numbers Re_D = [0.46 ×10^5, 1.8 ×10^5]. Results show that coning improves the power performance of a low aspect ratio small …
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Reduction of Secondary Flow Losses in a Turbine for Use in Man-Portable Power Generation
… solutions is through the application of a gas turbine engine; yet the challenge is extracting the energy efficiently through the small components. The focus of the research is on the turbine components and how the secondary flow losses from the generated airfoil shapes can be reduced to improve …
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ANALYTICAL FATIGUE DAMAGE CALCULATION FOR WIND TURBINE SUPPORT STRUCTURE
… plays an important, often crucial role in the design of wind turbine support structures due to the large number of wind-induced and operational stress cycles. Flexibility of the tower foundation is usually specified during the turbine design certification to achieve a natural frequency to …
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Numerical Analysis of an Axial Flow Horizontal Axis Marine Hydrokinetic Turbine
… to have a thorough understanding of the turbine performance and wake properties before determining the array arrangement for tidal farms. In this thesis, flow behavior in the wake of a counter-rotating dual rotor horizontal axis tidal turbine is studied by numerically solving the Reynolds …
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An integrated CAD methodology applied to wind turbine optimization
Modern engineering practice for designing physical products requires the creation of a CAD model of the design for documentation and manufacturing. As the design evolves from concept through to production, it is analyzed a number of times, in some cases using general parameters and in others …
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Wind turbine dynamics identification using gaussian process machine learning
Wind turbine controllers require dynamic information about the turbine for design and operation purposes. These dynamics are currently determined from simulation models during the turbine design stages. Hence, the dynamics for a given operational turbine will not be identical to those assumed by …
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System Performance Model and Control System for a Small-Scale Horizontal Axis Wind Turbine
<p>Predicting the performance of wind turbines is a key part of the turbine design process and operation, as predictive models play a large role in determining potential power output and efficiency at different operating conditions to help maximize production. On small-scale wind turbines …
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Prediction of natural frequencies of turbine blades for turbocharger application. An investigation of the finite element method, mathematical modelling and frequency survey methods applied to turbocharger blade vibration in order to predict natural frequencies of turbocharger blades.
… B76D88, A86E93, C86G90, C86L90 and C125L89 turbine wheel designs for various environmental conditions were investigated by application of Finite Element Analysis and beam theory. Modelling and simulation methods were developed ; the first method composed of 15 finite element simulations ; …
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Influence of geometry on the dynamic behaviour of steel tubular towers for onshore wind turbines
… in the need for the understanding of wind turbine design by South African engineers. The dynamic analysis of wind turbine structures, is of particular interest to Civil Engineers. Wind turbine towers are recently of the monopole or tubular type tower, predominantly constructed of either …
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Turbulence Modeling and Simulation of Unsteady Transitional Boundary Layers and Wakes with Application to Wind Turbine Aerodynamics
… studies on wind farm location selection and wind turbine design. Full-scale experiments and high-fidelity simulations are restrictive due to the prohibitively high cost, while the model-scale experiments and low-fidelity calculations miss key flow physics of unsteady high Reynolds number flows. A …
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The design and analysis of radial inflow turbines implemented within low temperature organic Rankine cycles
… choice. However, for a 10 kWe system, a well-designed radial inflow turbine could achieve a higher efficiency, and bridge an observed gap between the output powers of existing volumetric expander systems. This thesis investigates the design and analysis of radial inflow turbines for this …
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The Effect of Heat Transfer on Turbine Performance
… of the combustor being cooled in most large gas turbines, the effect this cooling has on their performance is still unclear. Fundamental questions, such as how turbine efficiency should be defined and which flow features reduce performance, remain unanswered. This thesis answers these questions …
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