摘要
采用Hermite插值函数生成代数网格,分别计算了翼型在雷诺数为5×104、1×105、2×105和5×105时的流动情况,对翼型在不同雷诺数下的尾涡脱落机制进行了分析。结果表明:翼型出现周期性流动后,流体黏性效应的降低导致相同攻角下的斯特劳哈尔数随雷诺数的增大而增大;不同雷诺数下翼型升力系数的变化规律与翼型尾涡的脱落规律保持一致;翼型升力系数峰值出现在尾缘逆时针涡刚脱落完毕时,谷值出现在尾缘逆时针涡发展至最大时;翼型进入周期性流动后,尾涡脱落将随着攻角的增大呈现2S(Single)模态—2P(Pair)模态—混沌状态—准周期性流动的发展规律。文中对不同雷诺数和攻角下翼型气动特性和尾涡脱落机制的分析,为流动控制方法的设计提供了依据。
The wake vortex shedding flow mechanism of airfoils at different Reynolds numbers(Re=5×104,1×105,2×105,5×105,respectively)was analyzed in this paper,by generating algebraic meshes with Hermite interpolation function.The results show that,when periodic flow occurs,Strouhal number increases with the increase of Re at the same angle of attack as the fluid viscosity decreases;and that,the variation of lift coefficient of airfoil is consistent with that of wake vortex shedding.The peak lift coefficient appears just after the tail edge counterclockwise vortex sheds,while the valley lift coefficient appears when the tail edge counterclockwise vortex reaches the maximum size.When the airfoil enters the periodic flow state,the development law of wake vortex shedding is 2S(Single)mode first,then 2P(Pair)mode,chaotic state,and finally quasi-periodic flow state,as the angle of attack increases.The investigation into the aerodynamic characteristics and wake vortex shedding mechanism provides a basis for the design of flow control methods.
作者
杨筱沛
王威
蒋博彦
丁炎炎
王军
YANG Xiaopei;WANG Wei;JIANG Boyan;DING Yanyan;WANG Jun(School of Energy and Power Engineering,Huazhong University of Science and Technology,Wuhan 430074,Hubei,China)
出处
《华南理工大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2020年第10期96-104,112,共10页
Journal of South China University of Technology(Natural Science Edition)
基金
国家重点研发计划项目(2018YFB0606101)。
关键词
二维翼型
代数网格
非定常流动
尾涡脱落
two-dimension airfoil
algebraic meshes
unsteady flow
wake vortex shedding
