风电场典型复杂地形的数值模拟研究

NUMERICAL SIMULATION OF TYPICAL COMPLEX TERRAIN OF WIND FARMS

以典型复杂地形山丘的三维模型为研究对象,采用CFD数值模拟方法并选用SST湍流模型研究均匀来流条件下,坡度为15°、30°和45°时山丘周围流体绕流的特点。对比分析不同时刻坡度不同时山丘附近不同位置处的速度分布,讨论山丘背风面旋涡生成发展与耗散的过程,研究山丘中截面涡运动情况。研究结果表明山顶处风速品质较好,可考虑安装风力机;在背风面,由于流动旋涡的存在,不适合安装风力机。山丘的坡度对速度分布的影响主要表现在山顶和背风坡下游位置处。坡度越大,山顶的加速效应越明显,背风坡旋涡的生成、运动、发展和耗散的过程越复杂。

The three-dimensional model of typical complex terrain axsymmetrical hill is numerically investigated by using CFD numerical simulation method with SST turbulence model in this paper.The characteristics of the fluid flow around the axisymmetrical hill with different grade of 15°,30°and 45°in the condition of uniform speed are studied.The velocity distribution near the axisymmetrical hill with different grades at different locates in different time is analyzed in this paper.The process of the vortex generation and dissipation is discussed in the leeward side.The motion of vortex in the middle section of the axisymmetrical hill is studied.The results show that the quality of wind speed on the top of the hill is good,and it is suitable for installing wind turbines.In the leeward side,it is not suitable for installing wind turbines,because of the vortex motion.The influence of the grade of the axisymmetrical hill on the velocity distribution is mainly manifested the top of the hill and downstream of the leeward side.The greater grade of the hill,the effect of the acceleration on the top of the hill is more obvious and the process of the vortex generation and dissipation in the leeward side is more complex.