考虑平稳风修正和塔架干扰的风力机叶片3-D风场模拟

Numerical Simulation of 3-D Wind Field for Wind Turbine Considering Tower Interaction and Modification of Steady Wind

为准确模拟风力机纵向、横向和垂直向的3-D随机风场,以南京航空航天大学自主研发的NH1500风力机为例,首先采用考虑沿高度变化的指数模型、塔影效应影响的潜流模型和上游风机尾流影响的涡流粘度模型对平稳风进行修正。然后基于空间变化的改进Von Karman风谱模型,结合谐波叠加法模拟风力机的来流脉动风速时程,再利用改进的叶素-动量理论获得考虑叶片旋转效应和塔架-叶片相干效应的风力机纵向、横向和垂直向3-D随机风场。该方法充分考虑风力机风场模拟的外界干扰因素和自身特性,提高了风力机系统风场模拟的准确度。算例分析表明,本文方法可以准确地模拟给定风环境的风力机系统3-D风场。

In order to accurately simulate 3-D wind field of wind turbines, taking the NH1500 wind tur- bine researched by Nanjing University of Aeronautics and Astronautics as an example, the exponential model for changing height, the undercurrent model for tower shadow effect and the eddy viscosity model for wake effect from upstream wind turbine are used to modify the steady wind. Then based on the mod- ified Von Karman wind speed spectrum model, the incoming wind speed time history is simulated by the harmony superposition method. Finally the 3-D wind field considering the rotational effect and blade- tower interaction effect is obtained with the modified blade element momentum theory. The external in- terference factors and itself characteristics are fully considered to improve the accuracy of wind field sim- ulation. The results show that the proposed algorithm is of high accuracy, which can be used to simulate 3-D wind field of wind turbines under given wind condition.