【摘要】 传统阻力型垂直轴风力机具有结构简单、低风速启动、成本低等优点,但其风能转换效率较低。为改善传统阻力型风力机的风能转换效率,基于仿生原理提出了一种新型叶片结构的风力机,其结构设计借鉴了鱼脊线结构和Savonius型风力机的叶片结构的特点。通过二维数值模拟方法研究两种风力机的气动特性,并对两种风力机进行对比分析。结果表明,在风速8m/s条件下,新型风力机的扭矩和效率系数优于传统Savonius型风力机,且在较低叶尖速比时达到最高效率,该风轮的三叶片结构布局可引导气流进行二次驱动,从而实现风能转换效率的提升。更多还原

【Abstract】 The drag-type vertical axis wind turbines(VAWTs)had advantages of simple structure,self-starting at low wind speed and low cost,but they showed low wind energy conversion efficiency. A novel vertical axis wind turbine was proposed aiming to improve the disadvantage of the traditional wind turbines based on bionic principle in this paper,the structure of the novel vertical axis wind rotor was designed by combining traditional Savonius wind rotor structure and fish ridge structure.Aerodynamic performance of the novel wind rotor and a traditional Savonius wind rotor were numerically explored and predicted by numerical simulation method for their non-linear two-dimensional unsteady flows,and performance comparison of the two wind rotors was also carried out. Under the condition of 8 m/s speed,the torque and efficiency coefficient of the new wind rotor was better than that of the traditional Savonius wind rotor,and it achieves the highest efficiency at a low blade tip speed ratio. The three blades structural layout of the wind rotor can guide the second drive of the air flow,so as to improve the conversion efficiency of wind energy.更多还原