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Improvement of Marine Current Turbine Blade Design by Using the Genetic Algorithm
|Authors: ||Wang, Shih-Yun|
|Contributors: ||NTOU:Department of Systems Engineering and Naval Architecture|
genetic algorithm;horizontal axis current turbine;boundary element method;RANS;turbine blade design
|Issue Date: ||2017-11-02T09:04:38Z
In this thesis, a procedure for the design of current turbine blade geometries is developed. In this procedure, a genetic algorithm for optimizations integrating with a boundary element method (BEM) for computations is used for the blade geometry design, and to optimize the current turbine performance. A BEM method and a viscous flow RANS method are then adopted for the analysis of the current turbine blade performance and flow field. For these two computational methods, validations were also carried out by comparing to the experimental data. It was found that the results of two methods are close to each other near the design point, and the discrepancies between the numerical results and experimental data are within acceptable range. Therefore, it is reliable to apply these two methods in design and analysis in the present procedure. To demonstrate the developed design procedure, several geometric parameters are designed on hydrodynamics, and they are number of blades, pitch distribution, camber distribution and chord length distribution. The stress and deformation analysis is then carried out, and it is found that all the designs are structurally strong enough. Overall, the three blade geometry showed a promising and balanced performance among all designs. The performances of designed current turbine in oblique inflows are also evaluated to understand the power decrease due to inflow angles. The major contribution of this thesis is the development of a current turbine design procedure, and proof of its feasibility.
|Appears in Collections:||[系統工程暨造船學系] 博碩士論文|
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