风电场风资源计算的CFD模型研究  

CFD Model for Wind Farm Resource Evaluation

作　　者：张晓东 

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京102206

出　　处：《现代电力》2013年第4期39-43,共5页Modern Electric Power

基　　金：国家国际科技合作计划资助(2010DFA64600)

摘　　要：由于工业领域相对成熟的CFD计算模型通常不适用于风电场中大气边界层流动的计算,对采用k-ε湍流模型求解不可压缩流体雷诺时均N-S方程(RANS)的数值计算方法进行了改进。基于国内的实际测风数据修正了湍流模型常数,采用地表粗糙度长度构建壁面函数描述地表影响,对中性大气边界层表面层的风廓线模型进行了修正以适用于整个大气边界层。水平地形条件下的CFD计算结果与风廓线模型基本一致。采用该CFD计算模型对一个风电场的流场和风电机组的发电量进行计算,结果和实际数据基本吻合,从而验证了所建立的CFD方法的可用性。CFD simulation technique is relatively mature in industrial field, but those models are generally not suitable for calculation of atmospheric boundary layer （ABL） flow over a wind farm. A CFD model adopting k - e turbulence model along with incompressible Reynolds- Averaged Navi- er- Stokes （RANS） equations is improved for wind farm flow calculation. The turbulence model constants are decid- ed by a wind data set measured at a domestic wind farm. The wall functions are constructed with roughness length di- rectly to describe ground surface effect. A set of surface lay- er wind profiles is modified to adapt to entire extension of ABL in neutral stratification. It is found that the CFD mod- el is consistent with the wind velocity profile over flat ter- rain. Flow field as well as power output of a wind farm are calculated with the improved CFD model, the simulation re- sult is in good agreement with the operating data and ap- proved the applicability of the proposed CFD method.

关 键 词：计算流体力学 大气边界层 中性大气 风廓线 风电场 风资源 

分 类 号：O357.1[理学—流体力学]