Brake Aerodynamic Drag DROPOUT Vertical Axis Wind Turbines

Wind energy is a inexhaustible clean energy. With the increasing consumption of conventional energy, environment pollution get more and more serious consequently, wind energy utilization has become one of the priorities of energy saving all aroud the world. After a long period of technology accumulation and market application,wind electricity has become the main way of wind energy utilization. At the same time, wind heating system become a promising direction. Meanwhile, wind heating system is also facing controlling problems at the variety conditions. The braking system bear the brunt of the wind turbine safety issues. Mechanical brake can be installed on the wind turbine’s rotating spindle. Aerodynamic braking system is also developed for brake system. And because of its features, aerodynamic braking system has become the integral part of the modern wind turbine.The main work of this thesis is to achieve a pneumatic brake for differential resistance type of vertical axis wind turbine in the limit conditions. Reducing exposure to the wind effectively, wind turbine maintenance and safety has been promised. According to the horizontal axis wind turbine pitch organization,the aerodynamic braking function can be realized. So the vertical axis wind turbine can also adjust the angle of the blades to complete the utilization of wind energy.In this paper, a rotatable blade system of resistance type vertical wind turbine is given, torsion spring can achieve good control of the blade angle. The purpose is to reduce the wind pressure on the blade and ensure the structural safety of the bladeat the limit condition. Torsion spring is designed to meet the limit conditions, the maximum rotating angle is under good control. And wind turbine has been matched with permanent magnet eddy current heating machine, experimental study to verify the feasibility of the blade aerodynamic braking system. All these works have laid a good foundation for future research and applications of wind turbine Pneumatic brake.