摘要
基于对CFD计算结果的动力模态分解(dynamic mode decomposition,DMD)方法来分析平均攻角、振荡幅度和折合频率对翼型动态失速流场的影响。首先对风力机S809翼型的多个动态失速非定常流场进行CFD数值模拟,得到翼型在振荡周期内升阻力系数随攻角的变化曲线,然后采用动力模态分解方法对非定常流场进行模态分析,从中得到非定常流场变化过程的主要模态和相应的频率以及能量等信息。通过对前8阶主要模态所包含的流场信息进行对比分析,DMD速非定常流场之间的差别。
Aiming at analyzing the influence of average angle of attack,oscillating amplitude and reduction frequency on flow field around airfoil under dynamic stall condition based on CFD calculating results. At first,the unsteady flow fields of an oscillating airfoil are calculated by CFD method under different dynamic stall conditions,through which,we can obtain lift and drag coefficients closed-loop curve under the pitch change. Then the dominant modes and corresponding frequencies are extracted from the CFD results by DMD(dynamic mode decomposition)method. By comparing eight dominant modes with one another,it is found that the DMD method captures the coherent structures with different scales in complex flow field successfully,and obviously reflects the differences between different dynamic stall flows after changing every parameter.
作者
胡智
刘鹏寅
沈昕
竺晓程
杜朝辉
Hu Zhi;Liu Pengyin;Shen Xin;Zhu Xiaocheng;Du Zhaohui(School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China)
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2019年第3期687-694,共8页
Acta Energiae Solaris Sinica
基金
国家自然科学基金(51506123)
