垂直轴风力机二维流场数值模拟

采用数值模拟的方法研究不同攻角、不同风速条件下naca0015翼型二维流场中的马赫数、雷诺数．通过比较叶片升、阻力系数变化，得出攻角为15°时翼型获得最佳的升、阻力系数．通过比较表面压强分布图、速度图和流线图，分析马赫数、雷诺数对naca0015翼型的影响，得出在相同的攻角、马赫数的条件下．随着雷诺数的增大翼型升力系数增大．阻力系数变小；在小攻角、低风速以及相同马赫数条件下，雷诺数较小时更易获得稳定的流场．

Two-Dimensional Flow Field Numerical Simulation for Vertical Axis Wind Turbines

There are many different types of airfoils that have been used in lift-type vertical axis wind turbines. In this paper, numerical simulation was used to analyze Mach number and Reynolds number in naca0015 airfoil two-dimen- sional flow field under different attack angle and wind speed conditions. From the curves of lift and drag coefficients, the optimum coefficients were obtained for attack angle of 15~. Under the consideration of surface pressure distribu- tion, velocity diagram, flow chart and the effects of Mach number, Reynolds number on naca0015 airfoil, it was concluded that with the same attack angle and Reynolds number, the lift coefficient of the airfoil increased while the drag coefficient decreased. With small attack angle, low wind speed and the same Mach number, different Reynolds number were used and then it is found that it is more likely to get a stable flow field with smaller Reynolds number.