垂直轴潮流能水轮机不同翼型叶片空化规律

为研究垂直轴水轮机叶片翼型形状对叶片空化的影响,采用数值模拟方法,对相同条件下相同相对厚度不同相对弯度的翼型,以及相同相对弯度不同相对厚度的翼型做了空化仿真。仿真结果表明,相同相对厚度不同相对弯度的薄、厚两种翼型,随着相对弯度增大,空化现象越易出现。相同相对弯度不同相对厚度的对称、相对弯度不为零的两种翼型,随着相对厚度增大,空化现象越易出现。同时监测了不同情况下翼型的升力系数和阻力系数,考虑到空泡的出现对翼型升力和阻力有所影响,将能量转化参数中的升力系数、阻力系数和升阻比与空化性能结合起来讨论。并将翼型按照相对弯度与相对厚度分组,分别探讨了相对弯度和相对厚度对翼型空化的影响规律,翼形相对厚度相同时,相对弯度越大,或者翼形相对弯度相同,相对厚度越大,则更容易空化。

Study on Cavitation Law of Different Airfoil Blades of Vertical Axis Tidal Turbine

In order to study the influence of the blade shape on the cavitation of vertical axis turbine,the numerical method is used to simulate cavitation under the conditions of the same relative thickness and different relative curvature in the same condition,and the same relative curvature and different relative thickness.The simulation results show that the cavitation phenomenon of thin and thick airfoils with the same relative thickness and different relative curvature is more likely to occur with the increase of relative curvature.With the increase of the relative thickness,cavitation is more likely to occur in two kinds of airfoils with the same relative curvature and different relative thickness.At the same time,the lift coefficient and drag coefficient of airfoil are monitored under different conditions.Considering the influence of cavitation on the lift and drag of airfoil,the lift coefficient,drag coefficient and lift drag ratio of energy conversion parameters are combined to discuss the cavitation performance.According to the relative curvature and relative thickness,the airfoil is grouped to discuss the impact on airfoil cavitation,and the rules are obtained,the greater the relative curvature of airfoils with the same relative thickness,or the greater the relative thickness of airfoils with the same relative curvature,the easier cavitation will be.