带导流板的一体化风机气动性能分析
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摘要
为了探究风轮结构参数对带导流板的一体化风机的气动性能影响规律,采用3D瞬态RNG k-ε湍流模型和滑移网格模拟风轮不同工况下,重叠比、叶片弯度以及导流板长度和安装角度对转矩系数和风能利用率的影响,分析了风轮内部流场变化,选取了最优参数进行综合仿真分析并进行了实验验证。结果表明:在重叠比为0.1,弯度为0.35时风机风能利用率达19%,比sandia实验室的风机提高3.5%;导流板有助于改善风轮内部流场,提高风机风能利用率。
In order to investigate the influence of wind wheel structural parameters on the aerodynamic performance of integrated turbine with a baffles,the influence of overlap ratio,blade camber,length of guide plate and installation angle on torque coefficient and wind energy utilization ratio under different working conditions of simulated wind turbine are simulated by 3D transient RNG k-epsilon turbulence model and slip grid. The optimal parameters are selected for comprehensive simulation analysis and experimental verification. The results show that the wind energy utilization rate of the turbine is 19% when the overlap ratio is 0.1 and the bend is 0.35,which is 3.5% higher than that in the Sandia laboratory. The guide plate is helpful to improve the internal flow field of the wind turbine and improve the wind energy utilization rate of the turbine.
In order to investigate the influence of wind wheel structural parameters on the aerodynamic performance of integrated turbine with a baffles,the influence of overlap ratio,blade camber,length of guide plate and installation angle on torque coefficient and wind energy utilization ratio under different working conditions of simulated wind turbine are simulated by 3D transient RNG k-epsilon turbulence model and slip grid. The optimal parameters are selected for comprehensive simulation analysis and experimental verification. The results show that the wind energy utilization rate of the turbine is 19% when the overlap ratio is 0.1 and the bend is 0.35,which is 3.5% higher than that in the Sandia laboratory. The guide plate is helpful to improve the internal flow field of the wind turbine and improve the wind energy utilization rate of the turbine.
引文
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[3]KACPRZAK K,LISKIEWICZ G,SOBCZAK K.Numerical investigation of conventional and modified savonius wind turbines[J].Renewable Energy,2013,60(4):578-585.
[4]田文龙,宋保维,毛昭勇.椭圆叶片Savonius风力机叶轮气动性能数值计算[J].中国电机工程学报,2014,34(32):5796-5802.
[5]TIAN W,MAO Z,ZHANG B,et al.Shape optimization of a savonius wind rotor with different convex and concave sides[J].Renewable Energy,2018,117:287-299.
[6]LEE J H,LEE Y T,LIM H C.Effect of twist angle on the performance of savonius wind turbine[J].Renewable Energy,2016,89:231-244.
[7]ANBARSOOZ M.Aerodynamic performance of helical Savonius wind rotors with 30°and 45°twist angles:Experimental and numerical studies[J].Proceedings of the Institution of Mechanical Engineers Part A Journal of Power&Energy,2016,230(6):523-534.
[8]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.
[9]魏望望,许京荆,马玉屏,等.Savonius风力机横纵向重叠比对启动性能的影响[J].工业控制计算机,2017,30(6):52-54.
[10]李鹿野,张维竞.某小型风机提高风能利用率的研究[J].节能技术,2015,33(4):295-298.
[11]陈忠维.垂直轴阻力型风力机功率计算方法研究[J].机械,2011,38(3):27-30.
[12]AMIRI M,TEYMOURTASH A R,KAHROM M.Experimental and numerical investigations on the aerodynamic performance of a pivoted Savonius wind turbine[J].Proceedings of the Institution of Mechanical Engineers Part A Journal of Power&Energy,2016,231(2):87-101.
[13]MORSHED K N,RAHMAN M,MOLINA G,et al.Wind tunnel testing and numerical simulation on aerodynamic performance of a three-bladed savonius wind turbine[J].International Journal of Energy&Environmental Engineering,2013,4(1):18.
[14]赵振宙,郑源,周大庆,等.基于数值模拟Savonius风力机性能优化研究[J].太阳能学报,2010,31(7):907-911.
[15]刘希昌,莫秋云,李帅帅,等.小型垂直轴风力发电机的气动噪声数值模拟与试验验证[J].流体机械,2016,44(6):11-16.
[16]王志光.施加一阶模态后风轮气动力的数值模拟[D].呼和浩特内蒙古工业大学,2014.
[17]常林,刘廷瑞,徐玮,等.大型水平轴风力机叶片气弹稳定性研究及控制[J].机械设计与研究,2018,34(2):199-204.
[18]MAHMOUD N H,EL-HAROUN A A,WAHBA E,et al.An experimental study on improvement of savonius rotor performance[J].Alexandria Engineering Journal,2012,51(1):19-25.