Numerical simulation on effects of number of blades with plate added at blade trailing edge on torque coefficient of vertical axis wind turbine
LI Yan1,2*, ZHAO Shouyang1, JIANG Yu1, FENG Fang1,2, ZHANG Tingting1
1.Engineering College of Northeast Agricultural University, Harbin, Heilongjiang 150030, China; 2.Heilongjiang Key Laboratory of Agricultural Renewable Resources Utilization Technology and Equipment in Cold Area, Harbin, Heilongjiang 150030, China
Abstract:In order to explore the influence of number of blades with plate added at the blade trailing edge on the aerodynamic characteristics of vertical axis wind turbine(VAWT), the torque coefficient of a VAWT with various numbers of blades was analyzed. The improvement in the flow field around the turbine blade was identified under different conditions of number of blades. The torque characteristics and static starting performance were calculated by numerical simulation for a SB-VAWT with seven curved plate lengths for 2, 3 and 4 blades based on a typical airfoil NACA0018, which has been often used in VAWTs. The simulated results showed that the aerodynamic characteristics of this lift-type VAWT were affected by the number of blades and the length of the curved plate. The increasing plate length can improve the performance of the wind turbine due to the drag, but could suppress the change in torque coefficient due to the increase of number of blades. Under the condition of different numbers of blades, the optimum curved plate length can optimize the static starting performance of the wind turbine. At different numbers of blades, a properly extended curved plate can optimize the static starting performance of the turbine, but the optimized performance occurs at different azimuth angles. Specially, the optimized performance is the best when the number of blades is 2, and the average torque coefficient is increased by 40%. This study has provided a basis for the design and optimization of blade trailing edge for VAWTs.
李岩,*, 赵守阳, 姜禹, 冯放,, 张婷婷. 叶片数对尾缘加弯板垂直轴风力机功率影响数值模拟[J]. 排灌机械工程学报, 2018, 36(3): 215-222.
LI Yan,*, ZHAO Shouyang, JIANG Yu, FENG Fang,, ZHANG Tingting. Numerical simulation on effects of number of blades with plate added at blade trailing edge on torque coefficient of vertical axis wind turbine. Journal of Drainage and Irrigation Machinery Engin, 2018, 36(3): 215-222.
[1]SAIDUR R, ISLAM M R, RAHIM N A, et al. A review on global wind energy policy[J]. Renewable & sustai-nable energy reviews, 2010, 14(7):1744-1762.[2]李岩,郑玉芳,赵守阳,等.直线翼垂直轴风力机气动特性研究综述[J].空气动力学学报,2017,35(3):368-382. LI Yan, ZHENG Yufang, ZHAO Shouyang, et al. A review on aerodynamic characteristics of straight-bladed vertical axis wind turbine [J]. Acta aerodynamica sinica, 2017,35(3):368-382.(in Chinese)[3]CONEJO A J, MORALES J M, MARTINEZ J A. Tools for the analysis and design of distributed resources—part Ⅲ: market studies[J]. IEEE transactions on power delivery, 2011, 26(3):1663-1670.[4]HOWELL R, QIN N, EDWARDS J, et al. Wind tunnel and numerical study of a small vertical axis wind turbine[J]. Renewable energy, 2010, 35(2):412-422.[5]林邓添.新型风力机专用翼型的试验研究[D].重庆:重庆大学,2010.[6]汪泉.风力机叶片气动外形与结构的参数耦合设计理论研究[D].重庆:重庆大学,2013.[7]FERREIRA C S, GEURTS B. Aerofoil optimization for vertical-axis wind turbines[J]. Wind energy, 2015, 18(8):1371-1385.[8]横井正.垂直轴风车及风车用叶片:中国,200580010262.5[P]. 2007-03-28.[9]陈珺, 孙晓晶, 黄典贵. 一种叶片前缘前带微小圆柱的垂直轴风力机[J]. 工程热物理学报, 2015, 36(1):75-78. CHEN Jun, SUN Xiaojing,HUANG Diangui. A new type of vertical-axis wind turbine equipped with the blades having micro-cylinders installed in front of their leading-edges[J]. Journal of engineering thermophy-sics, 2015, 36(1):75-78.(in Chinese)[10]赵振宙,陈潘浩,王同光,等.基于扰流技术的直叶片升力型垂直轴风轮的性能改善[J].机械工程学报,2016,22:146-152. ZHAO Zhenzhou, CHEN Panhao,WANG Tongguang, et al. Performance improvement of lift type wind turbine with straight blades based on interference airflow technology[J]. Journal of mechanical engineering,2016,22:146-152.(in Chinese)[11]梅毅. 低风速H型垂直轴风力机叶片翼型研究[D].哈尔滨: 哈尔滨工业大学, 2010.[12]李岩, 张婷婷, 田川公太朗,等. 叶片尾缘加弯板垂直轴风力机转矩特性数值模拟[J]. 东北农业大学学报, 2017, 48(3):72-79. LI Yan, ZHANG Tingting, TAGAWA K, et al. Nume-rical simulation on torque characteristics of vertical axis wind turbine with curved plate adding at blade trailing edge[J]. Journal of Northeast Agricultural University, 2017, 48(3): 72-79.(in Chinese)[13]李岩,赵守阳,曲春明,等. Savonius风力机静态流场PIV可视化试验研究[J].排灌机械工程学报, 2018, 36(2): 159-165. LI Yan,ZHAO Shouyang,QU Chunming, et al. PIV visualization experiment on static flow field of Savonius wind turbine[J]. Journal of drainage and irrigation machinery engineering, 2018, 36(2): 159-165.(in Chinese)[14]陈亚伟. 基于FLUENT轴流风叶的气动性能分析[J]. 流体机械,2016,44(10):51-54. CHEN Yawei. Aerodynamic performance analysis of axial fan based on FLUENT[J]. Fluid machinery, 2016, 44(10): 51-54.(in Chinese)[15]孙海涛,熊鹰,时立攀. 螺旋桨流固耦合特性的数值模拟[J]. 江苏大学学报(自然科学版), 2015, 36(1): 23-29. SUN Haitao,XIONG Ying,SHI Lipan.Numerical simulation of fluid-structure interaction characteristics for propeller[J]. Journal of Jiangsu University(natural science edition),2015,36(1):23-29.(in Chinese)