基于CFD方法对某风电场机组布局经验的数值分析

Numerical analysis of a wind farm unit layout experience based on CFD methods

文章针对量化风电场布局模式下风力机的运行状态进行流动数值模拟,验证了传统定量化风电场布局模式的合理性,并给出了实施进一步优化的方向。流动数值模拟采用Navier-Stocks控制方程求解器,粘性计算采用RNG k-ε湍流模型。数值模拟结果显示,传统风电场布局下各风力机尾迹区间隔较远,功率输出与单机状态差异微弱。在验证了经典风电场布局模式正确性的同时,说明该布局形式中各风力机间隔较远、总体占地面积偏大,仍有进一步优化的空间。与经典的WAsP量化风电场布局方法相比,采用流动数值模拟方法,能够更好地获得整个风场的流场特征及各风力机间的互相干扰情况,为风电场布局的优化设计提供理论依据,并进一步提升风电场的运行效益。

The paper applies numerical simulations to the wind turbines running under the state of an quantitative application wind farm layout mode, aiming at testifying the reasonableness of the layout mode and giving a specific direction towards further optimization. The numerical simulation uses Navier-Stokes equation solver and an RNG k-ε turbulence model is introduced for the viscous flow simulations. The numerical simulation results show that the downstream flow fields of the wind turbines arranged by the layout are far away from each other, and the integrated output power gap is close to that of the single-machine operation. Therefore, the validation of the conventional layout is testified, whereas the layout needs further optimization since the intervals among the wind turbines are longer than the necessary. Compared with the conventional WAsP(Wind Atlas Analysis and Application Programs) quantization wind farm layout method, the numerical simulation method obtains refined flow-field characteristics of the whole wind field as well as the mutual interference among wind turbines, providing a solid theoretical basis for layout design optimization and operation efficiency promotion.