低风速下H型垂直轴风力机气动性能

为了准确地研究低风速下H型垂直轴风力机的特性,以自主研发的H型垂直轴风力机为研究对象,采用数值模拟方法,分析了低风速下H型垂直轴风力机的气动性能和三维效应特征.分析结果表明:低风速区域,保持叶尖速比不变,改变风轮转速或来流风速,对H型垂直轴风力机的功率系数影响较大,且风速对叶尖速比的影响比转速的影响更敏感;在低风速区域,即使转速较大,风力机实际仍工作在低叶尖速比区域;在数值模拟中,设定合理的风速和转速的匹配有利于提高模拟结果的可靠性;在不考虑风剪切的情况下,三维效应受叶尖涡影响,且叶尖涡在0°方位角的位置时影响较大,同时还受风轮内流场的作用,且这种作用随着转速的增加而增强.计算结果为进一步研究H型垂直轴风力机提供了参考.

Aerodynamic performance of H type vertical axis wind turbine under condition of low wind speed

Based on independently developed airfoil of H type vertical axis wind turbines(H-VAWT)as the research object, the aerodynamic performance and three-dimensional effect of H-VAWT at the low wind speed condition are analyzed using the numerical simulation methods.The results showed that at the low wind speed condition, the change of the wind speed or rotating speed have a significant influence on the performance of the H-VAWT while keeping the tip speed ratio constant. The tip speed ratio is more sensitive than rotational speed considering the effect of wind speed. For the low wind speed case, H-VAWT works in the low tip speed ratio area,even if the rotational speed is high. Setting reasonable wind speed and rotational speed is necessary in the numerical simulation. Without considering the wind shear, three-dimensional effect is influenced by the tip vortex. The tip vortex mainly located in 0° azimuth angle play an important role. The three-dimensional effect is also influenced by the flow field inside, and the effect increases while the rotational speed increases. Further research on H-VAWT can use these results as references. 