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Numerical Calculation of Wind Turbine Flow Field and Design for Blades

Author: LeiYanSheng
Tutor: ZhouZhengGui
School: Nanjing University of Aeronautics and Astronautics
Course: Power Machinery and Engineering
Keywords: Wind turbine Numerical calculation Two-dimensional airfoils Reynolds number dynamic stall Three-dimensional wind wheel Design for blades
CLC: TK83
Type: Master's thesis
Year: 2009
Downloads: 205
Quote: 3
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Abstract


Wind turbine is a machine which changes wind energy to mechanical energy or electric energy in nature. Calculation of wind turbine aerodynamic performance is an important step of desinging and checking wind turbine. The accuracy calculation of wind turbine erodynamic performance directly affects blade aerodynamic performance and structure safety and further affects wind turbine efficiency and lifetime.This paper is financial aided by national basic research program of china(973). The research consists three parts. The first part is the numerical study on two-dimensional airfoils aerodynamic performance. Firstly, research on various parameters of calculation region, density, turbulence model and grid orthogonality affects calculation accuracy of two-dimensional airfoils aerodynamic performance in order to get a method on two-dimensional airfoils aerodynamic performance calculation with high accuracy. On this basis, do the research on reynolds number affecting two-dimensional airfoils aerodynamic performance. We can conclude that no matter flow type pump without separation and separated flow, cofficient of lift and drag will not change with reynolds number, after reynolds number larger than self-stimulated reynolds number. And then, for dynamic stall making great effects on two-dimensional airfoils aerodynamic performance, this paper use Fluent user define function setting moving mesh to research dynamic stall phenomenon in airfoil oscillation. After that we can get motion law for dynamic stall in two-dimensional airfoils oscillation.The second part is the numerical study on three-dimensional wind wheel aerodynamic performance. Firstly, calculated three-dimensional wind wheel aerodynamic performance according to two-dimensional airfoils cofficient of lift and drag based on blade element momentum theory. We can evaluate calculation accuracy of two-dimensional airfoils aerodynamic performance affecting three-dimensional wind wheel aerodynamic performance. Then we use CFD method to investgate three-dimensional wind wheel aerodynamic performance, comparing large eddy simulation with S-A turbulence model on calculation acuuracy. With the correction for wall interference, We can get a method on three-dimensional wind wheel aerodynamic performance calculation with high accuracy.The last part is the research on designing method for high-performance wind turbine at low wind velocity. Firstly, we construct initial blade modeling considering references. Then according to wind power utilization factor based on blade element momentum theory, we use genetic algorithm to optimize the important parameters which affect wind wheel aerodynamic performance those are chord length and installation angle. Finally we accomplish the blade modeling which has been optimized.

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CLC: > Industrial Technology > Energy and Power Engineering > Wind energy, wind machine > Wind machinery and equipment
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