摘要
针对大型风电机组叶片接闪器失效率高这一问题,创新提出一种新型外置人工定位雷击防护系统。首先,对新型接闪系统进行了高电压放电实验,用以研究雷击防护效果。分别对有/无加装新型雷击防护系统的风力机叶片进行了10次放电实验,从叶片击中概率来判定防护系统的防护效果。实验结果表明:在实验条件下,10次放电实验10次击中新型防护系统,新型防护系统的雷击接闪率大幅提高。并对有/无雷击防护系统的叶片进行了静电场计算,计算结果表明:雷击防护系统可以对叶片下引线周围电场起到屏蔽作用,有效降低下引线电场强度,从而提高新型雷击防护系统的防护效率。其次,在明确新型雷击防护系统的防护效果基础上,对有新型雷击防护系统的翼型段进行了气动计算。计算结果表明:在攻角0°～19°范围内,新型防护系统对翼型气动性能影响很小,这也进一步验证了新型雷击防护系统的可行性。
In order to solve the problem of high failure rate of blade flasher in large wind turbine,a new lightning protection system(NLPS) is proposed in this paper. First, a high-voltage discharge test is carried out for NLPS to study the effect of lightning protection. 10 discharge tests were carried out on the blades of wind turbine with or without NLPS, the protection effect of NLPS is judged from the lightning stroke probability of the blade. The test results show that at the test conditions,the 10 discharge tests hits the new protection system 10 times, and the lightning protection efficiency of NLPS is greatly improved. And then the electrostatic field of blades with or without NLPS is calculated. The calculation results show that NLPS can shield the electric field around the lower lead of the blade, effectively reduce the electric field intensity of the lower lead, and thus improve the protection efficiency of the NLPS. Secondly, on the basis of defining the protective effect of NLPS,the aerodynamic and noise calculation of the airfoil section with or without NLPS is carried out. The calculation results show that, in the range of attack angle(0°~19°), the NLPS has minimal influence on the aerodynamic performance of airfoil, it has little effect on the noise of airfoil. It also further verified the feasibility of the NLPS.
作者
李新凯
石可重
李苏威
何天宇
LI Xin-Kai;SHI Ke-Zhong;LI Su-Wei;HE Tian-Yu(Institute of Engineering Thermophysics,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100190,China;Key Laboratory of wind energy utilization,Chinese Academy of Sciences,Beijing 100190,China;China Electric Power Research Institute,Beijing 100192,China)
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2019年第3期529-536,共8页
Journal of Engineering Thermophysics
基金
国家自然科学基金资助项目(No.51806221)
国家自然科学基金资助项目(No.51705498)
国家电网公司科技项目(No.5442GY160050)
关键词
接闪器
叶片
雷击
气动性能
lightning protection system
blades
lightning stroke
aerodynamic performance
