Research On Wind Pressure Numerical Simulation Of Wind Turbine Tower Structure

Wind power has become an important part of the development in new energy formany countries around the world. The rapid development of wind power causes thesignificant innovation in the design and application of wind power equipment. The tower,as a tall, slender and flexible structure, supporting equipment and affecting the security andnormal function of equipment, is sensitive to the wind load. Therefore, there is necessaryto research the fluid properties of the tower in the wind fields and the law of wind pressureaffecting on the tower. As a result, the research so practical that it can not only provide themethod of selecting load value in the design of the tower, but also be the foundation of thecalculation and evaluation of the reliability of the tower.The study sample is a cone wind generator whose rated power is1.5MW in theBaiyun’ebo wind farm of the Inner Mongolia. In the study, the three-dimensional windfield model of cones type wind power generator in rated wind velocity, cut-out windvelocity and storm wind velocity was created with ANSYS, finite element software. Andcalculated flow field distribution of the wind touches cones type wind turbine with thenumerical simulation of CFD. At last, the distribution laws of wind pressure along theheight of tower and shape coefficient of the tower in the wind environment was proposedon the base of analyzing the change of fluid, the wind pressure on the surface and thecoefficient of wind pressure around the tower.To consider the affected of geomorphology to the wind turbine tower, the distributionof velocity field and wind pressure field around the drum tower structure was discussedwhen the wind turbine located in six kinds of typical isolated terrain(hillsides and ridges inthe slope of15°,30°and45°). The recommended value of climbing increment coefficientwas proposed through anglicizing and comparing to establish the connection between theplain and mountain wind pressure. There was a conclusion that the surface wind pressureof tower in mountains was larger than one in plains, on the other hand, effect laws of surface wind pressure in hillside and ridge were different, when the slope was15°, windpressure in the ridge were larger than the other one, but when the slope was30°or45°, theresult was just the opposite.Furthermore, on the basis of structural mechanical analysis, models of three-limb andfour-limb lattice tower were created in this paper. By the numerical simulation of finiteelement, the distribution of the surface wind pressure, wind velocity and others can becalculated. Contrast with the ordinary tower, key points designing lattice tower wasproposed.Above all, in the study, distribution laws of wind pressure and wind velocity of thelattice tower and the ordinary tower, which are in mountains and plains, can provide someguides about the method of selecting load value in the design of the tower. Moreover, thestudy also provided important value and guides for the design and innovation of thewind-power tower in the future.