Wind Resources Influence Factors Analysis For Complex Geographical Environment Based On Numerical Simulation

With the continuous development of economy,there is a urgent need for new energy resources in our country due to the constant increase of fossil energy consumption and the increasing seriousness of environmental pollution.The wind is greatly concerned due to its large reserves,no pollution to the environment and widely distributed in our country.However,,there are also some problems in the process of developing wind power,for example,in order to obtain the required observing site wind resources features,it is necessary to model the wind field terrain of complex terrain environment.Usually,the terrain is not easy for the installation of wind tower.All of these efforts can provide reference for wind turbines micro site selection and achieve the best use of wind energy resources and optimization of wind power mode.The thesis studies the wind resources influence factors of complex geographical environment based on numerical simulation,the main contributions are as follows:(1)The wind engineering theory and computational fluid dynamics(CFD)numerical method are analyzed.The main characteristics of atmospheric boundary layer wind resources are analyzed,including the wind field characteristics of atmospheric boundary layer of wind velocity profile,turbulence specification,and different landforms.At the same time,this thesis introduces the basic control equation of CFD,including the mass conservation equation,momentum equation,and energy conservation equations,the discrete method of control equation,including the concept of discrete and high order discrete space,and four methods for the numerical simulation of turbulence.(2)Based on the classic bell mountain model,a case study is conducted.The determination of convergence,mesh dependence,and the sensitivity of the turbulence model are studied.After that,through the revise of established numerical model,the results of field measured value,experimental value,and numerical simulation verify are compared.Finally,a set of suitable for mountain wind field numerical simulation method is identified.(3)The surface roughness of the mountain influence degree for mountain the overall impact of wind field characteristics is analyzed in the process of CFD numerical simulation.The simulation and calculation of single mountain model are conducted and the mountain slope concrete impact on the overall wind field parameters is analyzed.The simulation and calculation of two mountain arrangements in the two mountain models and the influence of mountain slope,wind direction angle,and distance between mountains on overall wind field parameters are analyzed.(4)Using the method of CFD and based on wind shear coefficient,a region's mountain wind farm actual terrain of southwest is studied.The wind field distribution of complex terrain is analyzed,and the wind shear coefficient change of the fan position is discussed.The feasibility of a fan being installed in this wind field and the impact of the wind shear coefficient on fatigue are analyzed.