动态来流及塔影效应对风力机尾迹特性影响研究
投稿时间:2018-12-29  修订日期:2019-03-19  点此下载全文
引用本文:
摘要点击次数: 202
全文下载次数: 0
作者单位邮编
杨莉* 湖南长沙国网湖南省电力有限公司 410129
基金项目:多兆瓦级海上风力机叶片的非线性振动与控制(11472103)
中文摘要:为了更接近风力机实际工作情况,选择了具有代表性的正常垂直风切变、极端垂直风切变、极端运行阵风和极端风向变化4种风况通过UDF对动态来流进行程序编译,基于FLUENT采用滑移网格技术和RNG研究了动态来流及塔影效应对风力机下游尾迹特性的影响,结果表明:通过UDF编译的动态来流与理论值完全吻合,验证了UDF的正确性;在动态来流工况下,风力机的功率输出均出现不同程度波动,尾迹结构由叶根到叶尖处出现明显变形;塔影效应使风力机扭矩和功率均减小,塔架表面升力出现激烈突变,对塔架的疲劳寿命产生不利影响。数值计算的结果对风力机组结构设计和风电场机组阵列分析具有重要参考价值。
中文关键词:动态来流  塔影效应  尾迹  风力机
 
Study on The Influence of Dynamic Inflow and Tower Shadow Effect on The Wake Characteristics of Wind Turbines
Abstract:In order to get closer to the actual working conditions of wind turbines, four typical wind conditions, namely, normal vertical wind shear, extreme vertical wind shear, extreme running gust and extreme wind direction change, are selected to program the dynamic incoming flow through UDF. Based on FLUENT, sliding grid technology and RNG, the effects of dynamic incoming flow and tower shadow effect on the downstream wake characteristics of wind turbines are studied. The results show that the dynamic inflow compiled by UDF is in good agreement with the theoretical value, which verifies the correctness of UDF. Under the dynamic inflow conditions, the power output of wind turbines fluctuates in different degrees, and the wake structure changes obviously from blade root to blade tip. The existence of tower shadow effect decreases the torque and power of wind turbines, makes the lift of tower surface change sharply, and fatigues the tower. Life expectancy has a negative impact. The results of numerical calculation have important reference value for the structural design of wind turbine units and the array analysis of wind farm units.
keywords:dynamic inflow  tower shadow effect  wake  wind turbine
查看全文   查看/发表评论   下载pdf阅读器