双转子对旋风力机多工况数值模拟

Numerical simulation of dual rotors counter-rotating wind turbine under multi-working conditions

以实验室双转子对旋风力机为研究对象,应用数值模拟方法获取了该风力机56个工况的性能数据,分析了其多工况性能以及典型工况S1面流谱,结果表明:相同转速条件下,风力机产生的功率随着来流风速的增加而增加;在功率图谱上,不同转速的功率等转速线斜率差异较大,高等转速线大于低等转速线的斜率;下游转子的进口气流角小于上游转子,导致其产生的功率大于上游转子;对旋风力机工作趋于区域里的点是速度三角形与翼型匹配,保证翼型工作的合理攻角范围内的工况。

Hereby a dual rotors counter-rotating wind turbine is taken as an experimental example, through which the performance data under 56 conditions are achieved, and then the performunce for multiworking status and flow pattern for typical S1 status are analyzed,which results indicate：the wind turbine generates more power with wind velocity increases under same rotating speed;In the power map,speed identity line＇s slop differs greatly in different rotating speeds ,the higher speed identity line＇s slope is steeper than the lower one;The downstream inlet flow angle is less than the upstream one,which makes the downstream rotor generate more power than the upstream rotor;In the working area of the counter-rotating wind turbine ,the velocity triangle matches with the wind turbine airfoil,which guarantees the airfoil to work in proper attack angle range.