摘要
基于升力面理论,将风力机叶片简化为由分布在叶片中弧面上的一系列等强度涡格,并结合全自由涡尾迹理论,建立了一种新的风力机叶轮气动模型。该气动模型增加了对翼型弯度影响的考虑,并通过全自由涡尾迹得到尾迹的准确的诱导作用。使用该模型对Mexico风洞实验中的三种工况进行了数值计算,对比了叶轮推力、扭矩,及叶片载荷分布的实验和仿真结果。比较了尾迹圈速,初始涡核大小和相对总粘性系数在不同的取值情况下的计算结果,以研究模型中参数对计算结果的影响。通过与实验数据的对比发现,该模型的初始涡核大小的选择对计算结果有比较大的影响,在涡核较大时候会带来结果的大幅偏离,而相对总粘性系数的影响效果较小。因此在使用该模型的时候,需要在选择合适的参数范围内以获取较高的计算精度。
Based on lifting surface theory, the wind turbine blade is simplified to be a series of constant strength vortex rings. With it and full free vortex wake method, an aerodynamic loads predicted model is proposed.Wind turbine in Mexico project is used to validate at given pitch angles but different wind speeds of tree cases. The trust force and torque of rotor （rod the spanwise load distributions of blades are compared to the experimental data. The influence of initial core radius and effective turbulent viscosity coefficient is also studied. The result shows the initial core radius significantly affect the simulation accuracy. Too large core radius may lead to significantly difference and non-convergence. But the effect of effective turbulent viscosity coefficient is not so significantly.
出处
《机械设计与制造》
北大核心
2017年第3期52-55,共4页
Machinery Design & Manufacture
基金
中央高校基本科研业务费专项基金资助(3102015BJ(Ⅱ)CG015)
