| Wind power has long been favored as a source of clean energy.Vortex-induced vibration bladeless wind turbine,referred to as Vortex-induced vibration wind turbine,is a kind of wind power generation device for wind energy acquisition,also known as the bladeless wind turbine,which converts wind energy into mechanical energy,and then converts mechanical energy into electric energy by using the principle of vortex vibration around the cylinder in the wind field.Compared with the classic impeller driven wind generator,the vortex vibration wind generator,no rotor,no gearbox,no yaw-device,no variable paddle device,the structure is more simple and compact,thus reducing the cost of products and operation and maintenance costs,easy to be miniaturized,can be used for remote periodic monitoring and other small electronic equipment.This paper tracks the technology frontier in this field,independently designs the detailed structure and many parameters,and establishes the three-dimensional models of several types of vortex-induced vibration wind turbines.In this paper,the vibration characteristics of cylinder and cone are studied by numerical simulation and real experiment,and the mechanism of vortex-induced vibration is preliminarily analyzed.In the process of research,two kinds of air tubes are made of the same material and supported by cantilever beams of the same material and size.This paper mainly includes the following contents.Air duct,air duct,cylindrical air duct,conical air duct(1)The study of using CFD numerical simulation of two-dimensional cylinder cover tube vortex induced vibration mechanism,to explore the cylinder cover cylinder under the condition of low wind speed of vortex induced vibration characteristics,establish a single degree of freedom vibration of cylindrical spring subsystem,the cylindrical vortex induced vibration displacement time history curve,frequency response,and lift coefficient frequency response and preliminary explore the feasibility of the vortex induced vibration power generation mode and application potential.(2)Through three-dimensional numerical simulation,the natural frequencies of cylinder and cone collecting tube were studied,different finite element analysis models were established,and the first six order modal shapes of cylinder and cone collecting tube were compared,CFD three-dimensional numerical simulation was used to study the fluid-structure coupling pressure neogram of the two,and a certain wind speed condition was taken as an example to illustrate the three-dimensional characteristics of the flow field pressure,which laid a data foundation for the subsequent real experiment comparison.(3)The experimental platform of vortex-induced vibration was built,and the experimental tests were carried out on two kinds of air collecting tubes with blunt body shape of cylinder and cone respectively.Design a reasonable experimental scheme,study the air duct’s mode,frequency,amplitude,and data analysis,for the follow-up research and development of the work to lay a foundation.Due to the limitation of time and level,the research work in this paper is only limited to the vibration characteristics of the collection tube in the vortex-induced wind turbine.There is still a lot of research space in the theoretical calculation,blunt body optimization and electromechanical coupling of the vortex-induced wind turbine. |
