【摘要】 基于RANS方程和RNG k-ε湍流模型,建立了用多重参考坐标系模型(Multiple Reference Frame, MRF)处理大型风电场中风电机组运行对风场中气候参数影响的数值计算方法。通过对布置不同台数2MW风力机组的山地风电场进行数值计算和分析研究,获得风电场运行时下游各位置的风速、风压及温度等风场特性,研究了风力机数量与气候参数间的关系。研究结果表明:风电场下游风速及风压的分布更多受山地地形的影响,不同数量风力机运行会对其分布产生局部影响;温度大小几乎不受风力机数量的影响,但近地温度分布将随风力机的运行数量发生改变。该计算方法可用于复杂地形风电场风力机组设置及局部地形改造,以改善风力机气动性能及下游气候参数,具有广阔的应用前景。更多还原

【Abstract】 In this paper, the numerically computational method is built which is based on RANS equations and RNG k-ε turbulence model. The method with multiple reference frames can be used to compute the climate parameters in large-scale wind farms when those wind turbines are working. Using this method, the wind farms built in mountainous area where are set up different number 2 MW wind turbines are computed, and the wind farm characters such as wind velocity, wind pressure and temperature in downstream are obtained. After that, the relation to the number of the wind turbines and the climate parameters can be derived. The simulation results show that the wind velocity and wind pressure in downstream will be decided by the terrain, and the distribution will be influenced by the number of the working turbines, that the temperature in wind field is not obvious though its distribution will be changed by the number of the working turbines. The computational method can be used to arrange the wind turbines or reform the part terrain that the aerodynamic performance of the wind turbine and the climate parameters can be improved, and owns a widespread application value.更多还原