风力机不同风况的动力学响应研究

发布时间：2018-12-09 14:18

【摘要】：风场风况是影响风力机气动和结构特性的直接因素,进而影响功率输出、稳定性和控制策略。在三维风场建模的基础上,对5种不同风况下的风速及相干湍流风的时域变化进行了模拟。结合气动计算结果对各风况下的叶尖挥舞和摆振位移,叶根挥舞、摆振、变浆力矩进行了动力学响应仿真,得到其各自的动态响应。控制策略采用变桨、变风速控制,极限风况下采用定时顺桨控制。结果发现克赫波更适合极限风况的仿真,并且通过添加相干湍流到基础湍流上能模拟拟序结构。同时,研究表明相较于参考风速为额定风速,在切出风速下,叶尖位移同时体现为挥舞和摆振,且变化频率、剧烈程度都增加;叶根载荷中挥舞弯矩均值较小,但在短时间内波动跨度大,是风力机叶片产生疲劳的主要载荷。
[Abstract]:Wind field is a direct factor affecting the aerodynamic and structural characteristics of the wind turbine, thus affecting the power output, stability and control strategy. On the basis of 3D wind field modeling, the time domain variations of wind speed and coherent turbulence wind under five different wind conditions are simulated. Based on the results of aerodynamic calculation, the dynamic responses of blade tip swing, blade root swing, shimmy and slurry changing moment are simulated and their respective dynamic responses are obtained. The control strategy is variable propeller, variable wind speed control, and timing propeller control under limit wind condition. The results show that the Koh wave is more suitable for the simulation of the limit wind conditions and the coherent turbulence can be added to the basic turbulence to simulate the quasi-ordered structure. At the same time, the research shows that compared with the reference wind speed is rated wind speed, under the cutting wind speed, the blade tip displacement is both flapping and swinging, and the frequency and intensity of the change are increased. In the blade root load, the mean value of the branching moment is small, but the fluctuation span is large in a short period of time, which is the main load of the wind turbine blade fatigue.
【作者单位】：上海市动力工程多相流动与传热重点实验室(上海理工大学);
【基金】：国家自然科学基金项目(E51176129) 上海市教育委员会科研创新(重点)项目(13ZZ120) 教育部高等学校博士学科点专项科研基金(博导类)(20123120110008)~~
【分类号】：TM315

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