Evaluation of LM 43.8P blade performance at different hub height wind speeds using blade element momentum theory

G. L. Augusto, W H Chen, L. G. Gan Lim
{"title":"Evaluation of LM 43.8P blade performance at different hub height wind speeds using blade element momentum theory","authors":"G. L. Augusto, W H Chen, L. G. Gan Lim","doi":"10.1088/1755-1315/1372/1/012004","DOIUrl":null,"url":null,"abstract":"\n An investigation was conducted on a three-bladed rotor similar to AVANTIS AV908. The rotor blade is appropriate for a Class I wind turbine generator and consists of three LM 43.8P blades. The 2.5 MW gearless wind turbine generator has a rated rotational speed of 16 rpm. An analysis of the LM 43.8P blade’s aerodynamics was carried out using the Blade Element Momentum (BEM) Theory to assess the turbine’s performance at different hub height wind speeds. The study employed three BEM models, including the original BEM concept without correction factors, the BEM Theory by DNV/Ris0, and the BEM Theory obtained from GH Bladed. The rotor radius is 45.1 m, and the blade comprises five different airfoils with a design tip speed ratio of 7.557. The axial and tangential induction factors, lift and drag coefficients, aerodynamic forces, and torque profiles as a function of the nondimensional rotor blade were calculated and compared with the numerical solutions obtained from the BEM models at varying upstream wind speeds. The calculation results revealed that with the original BEM concept, the axial induction factor for this particular blade became larger than 0.5 when the upstream wind speed was less than 7.45 m/s. This suggests that the Momentum Theory becomes invalid for lower wind speeds. However, the thrust force, driving force, and torque may be considerably over-predicted with hub height wind speeds larger than 9.50 m/s. It was found that out of the three models considered, the GH Bladed BEM model bears a striking resemblance with the actual power curve of AV908 with a confidence level above 95%, as indicated by a correlation coefficient of 0.99915 and a t-value of 0.51606 using Student’s t-test, implying that the two power curves have no significant difference.","PeriodicalId":506254,"journal":{"name":"IOP Conference Series: Earth and Environmental Science","volume":"23 2","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"IOP Conference Series: Earth and Environmental Science","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1088/1755-1315/1372/1/012004","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0

Abstract

An investigation was conducted on a three-bladed rotor similar to AVANTIS AV908. The rotor blade is appropriate for a Class I wind turbine generator and consists of three LM 43.8P blades. The 2.5 MW gearless wind turbine generator has a rated rotational speed of 16 rpm. An analysis of the LM 43.8P blade’s aerodynamics was carried out using the Blade Element Momentum (BEM) Theory to assess the turbine’s performance at different hub height wind speeds. The study employed three BEM models, including the original BEM concept without correction factors, the BEM Theory by DNV/Ris0, and the BEM Theory obtained from GH Bladed. The rotor radius is 45.1 m, and the blade comprises five different airfoils with a design tip speed ratio of 7.557. The axial and tangential induction factors, lift and drag coefficients, aerodynamic forces, and torque profiles as a function of the nondimensional rotor blade were calculated and compared with the numerical solutions obtained from the BEM models at varying upstream wind speeds. The calculation results revealed that with the original BEM concept, the axial induction factor for this particular blade became larger than 0.5 when the upstream wind speed was less than 7.45 m/s. This suggests that the Momentum Theory becomes invalid for lower wind speeds. However, the thrust force, driving force, and torque may be considerably over-predicted with hub height wind speeds larger than 9.50 m/s. It was found that out of the three models considered, the GH Bladed BEM model bears a striking resemblance with the actual power curve of AV908 with a confidence level above 95%, as indicated by a correlation coefficient of 0.99915 and a t-value of 0.51606 using Student’s t-test, implying that the two power curves have no significant difference.
查看原文
分享 分享
微信好友 朋友圈 QQ好友 复制链接
本刊更多论文
利用叶片元素动量理论评估 LM 43.8P 叶片在不同轮毂高度风速下的性能
对类似于 AVANTIS AV908 的三叶转子进行了调查。该转子叶片适用于 I 级风力涡轮发电机,由三个 LM 43.8P 叶片组成。2.5 兆瓦无齿轮风力涡轮发电机的额定转速为每分钟 16 转。使用叶片动量(BEM)理论对 LM 43.8P 叶片的空气动力学进行了分析,以评估涡轮机在不同轮毂高度风速下的性能。研究采用了三种 BEM 模型,包括不含修正系数的原始 BEM 概念、DNV/Ris0 的 BEM 理论以及从 GH Bladed 获得的 BEM 理论。转子半径为 45.1 米,叶片由五种不同的翼面组成,设计叶尖速度比为 7.557。计算了轴向和切向感应系数、升力和阻力系数、空气动力和扭矩剖面作为转子叶片非尺寸的函数,并与 BEM 模型在不同上游风速下的数值解进行了比较。计算结果表明,在原始 BEM 概念下,当上游风速小于 7.45 米/秒时,该叶片的轴向感应系数大于 0.5。这表明动量理论在风速较低时失效。然而,当轮毂高度风速大于 9.50 米/秒时,推力、驱动力和扭矩可能会被大大高估。研究发现,在所考虑的三个模型中,GH 叶片 BEM 模型与 AV908 的实际功率曲线极为相似,置信度在 95% 以上,相关系数为 0.99915,采用学生 t 检验的 t 值为 0.51606,这意味着两条功率曲线没有显著差异。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 去求助
来源期刊
自引率
0.00%
发文量
0
期刊最新文献
Simulation on solidification process of molten salt-based phase change material as thermal energy storage medium for application in Stirling engine Hydrogen adsorption on titanium-decorated carbyne C12 ring: a DFT study Experimental investigation into the effects of endplate designs for a Savonius turbine Development of zwitterion-functionalized graphene oxide/polyethersulfone nanocomposite membrane and fouling evaluation using solutes of varying charges Wind resource assessment for turbine class identification in Bayanzhaganxiang, China
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
已复制链接
已复制链接
快去分享给好友吧!
我知道了
×
扫码分享
扫码分享
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术
文献互助 智能选刊 最新文献 互助须知 联系我们:info@booksci.cn
Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。
Copyright © 2023 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1