不同湍流模型对MEXICO风力机气动性能预测精度的研究  

Research on the Effect of Different Turbulence Models on the Aerodynamic Performance Prediction Accuracy of MEXICO Wind Turbines

作　　者：徐浩然 杨华 刘超[1] 洪泽东 

机构地区：[1]扬州大学,江苏省扬州市225009

出　　处：《中国电机工程学报》2013年第35期95-101,16,共7页Proceedings of the CSEE

基　　金：科技部中欧政府间国际合作项目(2010DFA64660);国家自然科学基金项目(50706041);江苏省研究生科研创新计划项目(CXLX13_907);江苏省水利动力工程重点实验室开放课题(K12019)~~

摘　　要：为了验证不同湍流模型对旋转风力机气动性能的预测精度,采用计算流体动力学软件ANSYS CFX 14.0,选用一方程Spalart-Allmaras(S-A)模型和两方程剪切应力输运(shear stress transport,SST)模型2种湍流模型对非偏航工况3种不同来流风速下的MEXICO实验风力机进行数值计算。分析了计算网格数对计算结果的影响,然后把2种湍流模型计算得到的叶片表面压力系数、叶片所受气动载荷以及三维翼型特性与实验结果对比发现:2种湍流模型对附着流动情况都有较高的预测精度,SST模型在分离流动工况下对叶片吸力面压力系数预测精度高于S-A模型;且2种湍流模型对分离流动都有一定的预测精度,但对大分离流动而言SST模型的预测精度相对较高。In order to validate the aerodynamic prediction accuracy of different turbulence models for rotating wind turbines, the commercial CFD software ANSYS CFX 14.0 was used to predict the aerodynamic performance of MEXICO wind turbine at three different inflow velocities under non-yawed condition. Two turbulence models, which included one equation Spalart-Allmaras （S-A） model and two-equation SST model, were employed to analyze the effect of calculation grid number on the calculated power of MEXICO rotor. Then, by comparing the calculated data of pressure coefficients, loads applied on blade, lift and drag coefficients of airfoils with the experimental data, this paper finds that the results calculated by two turbulence models show good agreement with the relevant experimental results under attached flow condition, SST model gives more accurate prediction about the pressure coefficients on suction side of blades under separated flow condition. By using both S-A and SST turbulence models to predict the performance of MEXICO wind turbine, certain accuracy can be obtained when flow separates, while SST model has higher prediction precision than S-A model under large flow separation condition.

关 键 词：湍流模型 数值模拟 风力机 网格 流动分离 

分 类 号：TK83[动力工程及工程热物理—流体机械及工程]