典型丘陵地形下风资源分布特征的研究

Research on distribution characteristics of wind resources in typical hilly terrain

为了探究典型丘陵不同高宽比下迎风坡的风资源分布特征,采用势流叠加理论与源板块法相结合,建立典型丘陵山地风场数学模型,利用MATLAB对典型丘陵地形下风场内的风资源特征进行仿真计算,分析3种不同坡度地形条件下位于迎风坡6个典型参考点在不同相对地面高度处水平方向风加速因子和垂直方向相对风速的变化规律;采用CFD软件分析各个参考点的湍流强度随相对地面高度的变化规律,确定合适的风机安装高度和位置。研究结果表明:丘陵地形高宽比在0.25~0.5时,随着高宽比的增加迎风坡上的风加速效应主要集中在垂直速度方向;TI值和强湍流区的变化趋势与地形的高宽比成正比。

For the purpose of exploring the distribution characteristics of wind resources at the windward slope under different height-width ratios of typical hills,a mathematical model for wind fields at hilly and mountainous areas is built according to the principle of potential flow superposition and the source plate method;a simulation calculation is made for characteristics of wind resources in wind fields under typical hilly terrains by applying MATLAB,thus,an analysis is done,under terrains with three different slopes,on the accelerated factor of horizontal wind and the change rule of the relative speed of vertical wind at different relative ground levels（the wind is located at six reference points of the windward slope）.Besides,CFD software is adopted to analyze the change rule of turbulence intensity at each reference point along with the relative ground level,and accordingly determine the proper installation height and location of draught fan. The research result shows that while the height-width ratio at the hilly terrain is between 0.25 -0.5,the acceleration effect of wind at the windward slope should be mainly on the direction of vertical speed as the depth-height ratio increases;TI value is proportional to the change trend of the strong turbulence zone and the height-width ratio of the terrain.