基于叶尖损失的风力机叶片气动性能数值模拟

Numerical Simulation of the Aerodynamic Performance of the Blades of a Wind Turbine Based on the Blade-tip Losses

针对叶尖损失对风力机载荷和输出功率的影响,对比分析了Glarent叶尖损失修正模型及Shen叶尖损失修正模型。以传统动量叶素理论为基础,基于改进的Shen叶尖损失修正模型提出了风轮空气动力学修正计算模型。借助此模型,对某小功率实验风轮的轴向和周向诱导因子以及输出功率进行了数值模拟,通过对实验风轮的测试数据进行整理分析,分别将风速10与15 m/s条件下提出模型的计算结果和实验数据进行了比较,验证了提出模型的可靠性。研究结果对风力机叶片载荷及疲劳特性的深入研究具有指导意义,同时为提高风力机输出功率,降低风电成本奠定了理论基础。

In the light of the influence of the blade tip losses on the load and output power of a wind turbine,contrasted and analyzed were Glarent and Shen blade tip loss correction model.With the traditional momentum blade element theory serving as the basis and based on the improved Shen blade tip loss correction model,the authors presented an aerodynamic correction calculation model for wind wheels.With the help of the model in question,a numerical simulation were performed of the axial and circumferential induction factors and output power of a small power test wind turbine.Through processing and analyzing the test data of the test wind wheel,the calculation results and test data of the model under discussion were compared at the wind speed of 10 m/s and 15 m/s respectively,verifying the reliability of the model.The research results can offer guidance for an in-depth study of the load and fatigue characteristics of the blades of a wind turbine and in the meantime,can lay a theoretical basis for enhancing the output power of a wind turbine and lower the cost of the wind power.