摘要
通过改变第一层网格到叶片壁面的距离来获得不同的壁面参数y^+值,结合SST k-ω湍流模型,采用CFD方法计算了垂直轴风力机在多个尖速比下的功率系数,将模拟值与风洞实验值比较并分析模拟误差产生的原因,研究了不同y^+值对数值计算结果的影响。结果表明,不同y^+值的模拟结果之间的差别随尖速比的增加逐渐缩小,y^+值的减小可以显著提高模拟计算精度,但也会使计算耗时增加。综合考虑计算效率和精度,控制y^+在5~10范围内适用于垂直轴风力机气动特性CFD计算。
In order to study the influence of y+on the computation of the aerodynamic performance for a vertical axis wind turbine,the power coefficients at various tip speed ratios of a vertical axis wind turbine were computed by CFD method,by changing the d \ n instance between the first layer grid to obtain different wall parameter y+,based on the turbulence model SST k-ω. The error between simulating data and experimental data was analyzed. Results show that differences among the simulation results are narrowed with the rising tips speed ratio. Also the calculation accuracy can be significantly improved by reducing y+with the increasing of the computing time. Taken the computation efficiency and accuracy into consideration,applying y+between 5 to 10 would be the best choice for the CFD simulation of vertical axis wind turbine aerodynamic performance.
出处
《电力科学与工程》
2017年第4期60-64,共5页
Electric Power Science and Engineering
关键词
垂直轴风力机
功率系数
CFD
壁面参数y+
湍流模型
vertical axis wind turbine
power coefficient
CFD
wall parameter y+
turbulence model
