Numerical Investigation On The Flow Of The Nearby Region To The Blades Of HWAT

The velocity distribution and pressure distribution in the flow field located at the nearby region of the rotor has been a focus of research which attracts both domestic experts and foreign scholars. A better understanding of the flow in this area helps master the acquirement rules and improvement methods of power output.The numerical investigation on the flow field around the rotor is carried on step by step by virtue of Fluent—Commercial CFD software in this paper. The flow is intuitionsticly described by the numerical results, which are presented in the form of contour/color maps/vector/line/rake/XY curves. In the process of simulation, the main parameters-lift/drag coefficients and partial flow visualization are compared with the related literature and PIV results.Finally, we find the error is acceptable in the engineering aspect.It has two major parts in this article. In the first part, the research basis is set. At the beginning, the optimal design of the secondary generation 100 Watt horizontal axis wind turbine is introduced. The design bases on blade element momentum (BEM) method. It is carried out by self-made program which bases on Matlab. Then, the separated flow of chosen airfoil NACA4415 is researched. What'more, five kinds of turbulence models are compared. In the second part, the main body research of the article is presented. We study the flow characteristic of the separated flow around 2D and 3D single blade as the factor of rotation is considered, especially the flow in the near wake region. Finally, the 3D rotation rotor is researched. The effect of model to tunnel area ratio and tip vane on the near wake is presented.In the process of numerical simulation, the mathematic model bases on Navier-Stokes formulation. Pressure Based or segregated, steady, implicit are set in the solver. Pressure-velocity coupling scheme is SIMPLE. Discretization scheme is Second Order Upwind scheme. The dimension and turbulence model are determined by the real models. The physical model and grid discretization is achieved by pre-processing software-Gambit. In order to decrease the meshes of the models and improve the quality of meshes, the"from bottom to top"method, that is"vortex-line-face-volume"way is adopted.Two conclusions are obtained in this paper. In one hand, the numerical research applies to calculating flow around the wind turbine. It can be a complementary and prediction way for experimental study. In another hand, turbulence model, the attack angles of airfoil, model to tunnel area ratio and tip vane affect the flow around the blade a lot. The further study to these effects is meaningful.