垂直轴风力机三维气动性能的数值模拟及分析

Numerical Research of 3D Aerodynamic Performance of Vertical Axis Wind Turbine

为深入了解直叶片垂直轴风力机的气动性能,并为垂直轴风力机优化设计提供思路,采用Fluent中的滑移网格技术对垂直轴风力机的流场进行了三维数值模拟。文中分析了该垂直轴风力机风轮流场的变化、风轮同一时刻不同截面处的流场分布特点、同一叶片在一个周期内处于不同相位角时的速度分布特性,并利用力矩系数的监测值及相关计算公式得出该风力机的风能利用系数。得出了垂直轴风力机进入稳定状态后流场变化具有周期性,尾流区域不断变窄,流场分布与所处相位角有关等结论,并在分析的基础上提出了一种在结构上可能具有更优潜质的变形垂直轴风力机。

In order to study the aerodynamic performance of the straight blade vertical axis wind turbine（VAWT）,the three-dimensional numerical simulation on the flow field of the wind turbine is simulated for its optimization design using the software Fluent based on the technology called sliding grids.Then an analysis has been taken,including the variation of the velocity field,the distribution of the velocity field on different sections at the same time,and one blade＇s distribution of the velocity and pressure field on different places in a period.At the same time,the wind-power utilization coefficient has been obtained by using its torque coefficient and related formulas.The result shows that the change of the flow field will periodically be under fully developed flow area.The wake area constantly narrowed.The distribution of the velocity and pressure is related to the phase angle.And a better wind turbine designing model which has a deformation has been proposed from this work.