The Static And Dynamic Characteristics And Flow Field Analysis Of Horizontal Axis Wind Turbine Tower

In recent years, due to the burning of conventional energy caused air pollution、 global warming and other issues become more and more serious. Shortage of resources and air pollution seriously restricted economic development and affected people’s health. Therefore, it was extremely important to develop renewable energy. wind power was a today’s most promising new energy on development and utilization one of its main role is to carry out wind power. The horizontal axis wind turbine is one of the main tools of wind power, which year after year to work in a complex environment, a variety of loads on top of a wind turbine tower, wind turbine failures and easily destroyed. So, it has a very necessary practical significance to analysis the static and dynamic characteristics and the flow field of Wind turbine towerThe problem according to the Lanzhou Municipal Science and Technology project "Design megawatt horizontal axis wind turbine key technology research"(2013-4-110), 1.5 MW horizontal axis wind turbine towers as the object of the study, using APDL language establish Geometry and element modeling of tower to analysis which at the presence or absence of the tower openings, with or without foundation four kinds of conditions the static strength and modal in order to obtain displacement and stress cloud and order as well as the first five natural frequencies and modal FIG. Based on the theory of computational fluid dynamics to give the tower in three wind pressure coefficient distribution, the horizontal cross section of the flow velocity vector field and flow field pressure to analysis the tower surface pressure and flow field characteristics around. The main work is as follows:First, using APDL language establish Geometry and element modeling of tower and establishing coordinates and mechanical model of the tower according to the theory of statics and calculating the main tower load and displacement suffered by the overhead. Then, carrying out on the basis of the tower in the presence or absence of, or without the door opening four types of work conditions of static analysis, calculating the maximum stress value of the maximum amount of displacement of the tower at the top and bottom of the tower.Secondly, establishing differential equations based on the theory of modal analysis, describing the basic methods modal analysis and determining the modal analysis program.through writing the language of APDL to analysis four types of modal solver conditions and accessing to the tower five Order FIG natural frequencies and mode shapes to campare the the impact for th e natural frequency on openings and basic.Finally, according to the computational fluid dynamics theory, choosing the appropriate FLUENT Simulation of Turbulent methods and models, select ing the appropriate solver, setting the boundary conditions and ph ysical parameters.It carry out numerical simulation of the tower in three Winds and comparative the influence of surface pressure and wind speed on the tower around the flow field. It Provide a theoretical basis for the development of wind turbine design.