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对MATLAB编程得到的1.2MW风力机组叶片采用预弯处理,分别建立未预弯,预弯0.3、0.6及0.9m4种预弯尺寸的叶片并对其采用SST κ-ε湍流模型进行数值研究。对模拟结果进行比较分析,得到了预弯尺寸对风力机性能的影响及合理的预弯尺寸。结果表明:未预弯时风力机的输出功率大于设计功率,相对误差为2.48%;预弯0.9m时输出功率小于设计功率,相对误差为3.9%;预弯0.6m时输出功率相对设计功率的误差为0.0006%,风力机的输出功率表现出随叶片预弯尺寸增大而减小的特性,并呈非线性特征。
The 1.2MW wind turbine blade programmed by MATLAB was pre-bent to establish pre-bent, pre-bent 0.3,0.6 and 0.9m pre-bent blades of 4 sizes, and the numerical simulation was carried out using SST κ-ε turbulence model. The simulation results are compared and analyzed. The influence of pre-bending size on the performance of wind turbine and the reasonable pre-bending size are obtained. The results show that the output power of the wind turbine is greater than the design power with no pre-bending, the relative error is 2.48%. When the pre-bending is 0.9m, the output power is less than the designed power, the relative error is 3.9%. When the pre-bent 0.6m, The error is 0.0006%. The output power of the wind turbine shows a decreasing characteristic with the increase of blade pre-bending size, and shows a nonlinear characteristic.