基于升力面混合模型的水平轴风力机性能研究

A Study on the Performances of Wind Turbine with Horizontal Axis Based on the Hybrid Model of Actuator Surface

提出了叶素方法(BEM)与升力面法相结合的一种新型混合模型.将叶片用一平面代替,并在叶片平面上采用压力跳跃边界条件,混合模型将CFD解算器与叶素方法(BEM)联合起来进行迭代求解,首先采用BEM模块根据入流条件和叶片各段面翼型的气动参数确定叶片上的不连续分布压力,然后采用CFD模型根据压力分布计算叶片上的力和转轮的流场尾迹结构等流场参数,CFD计算得到的流场参数再应用到BEM模块进行计算.每次迭代得到的流场参数与上次得到的值进行比较,残差达到要求则迭代过程结束.将该混合模型用于求解NREL第6期风力机出力性能,并与试验结果对比,得到了满意的效果.

A hybrid model of the actuator surface combined with the blade element method （BEM） is presented. The blades are repIaeed by a mean surface and a ＂pressure jump＂ boundary condition is applied here. The hybrid model combines a CFD solver with the BEM. The solving method is iterative, at the beginning of iteration the BEM determines the pressure discontinuities along the blade span, using the rotor inflow and the aerodynamic properties of blade sections. Then the CFD solver applies this pressure discontinuity in order to model the blade forces and the wake downstream the rotor. The results were applied to the BEM module for the next calculation. At the end of iteration the obtained flow parameters and the residuals are compared with those obtained from previous iteration. If the required precision is attained, the calculation stops. Finally,the proposed hybrid model is used to calculate the performance of NREL Phase VI wind turbine and the results are satisfactory.