RESEARCH ON CHAOTIC FEATURES OF A FLOW FIELD OVER A PLUNGING AIRFOIL BASED ON DYNAMIC MODE DECOMPOSITION

被引：3
|
作者：
Qi, Yuhang [1 ]
Yang, Wenqing [1 ,2 ]
Wang, Yue [1 ]
Song, Bifeng [1 ,3 ]
机构：
[1] Northwestern Polytech Univ, Sch Aeronaut, Xian, Peoples R China
[2] Northwestern Polytech Univ Shenzhen, Res & Dev Inst, Shenzhen, Peoples R China
[3] Northwestern Polytech Univ, Yangtze River Delta Res Inst, Taicang, Peoples R China
来源：
JOURNAL OF THEORETICAL AND APPLIED MECHANICS | 2021年 / 59卷 / 02期
基金：
中国国家自然科学基金;
关键词：
plunging airfoil; chaotic flow; dynamic mode decomposition; thrust characteristic; irregularity;
D O I：
10.15632/jtam-pl/134803
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
Periodic motion of a plunging airfoil causes continuous changes in the surrounding flow field. The time-dependent thrust coefficient depends entirely on unsteady characteristics of the flow field. On the contrary, the time-dependent thrust coefficient may also reflect the unsteady characteristics of the corresponding flow field. With the fast Fourier transform (FFT) and dynamic mode decomposition (DMD), unsteady aerodynamic forces can be correlated with the flow field characteristics in the frequency domain. In the present paper, DMD is performed to analyze the unsteady characteristics of the flow field around a plunging NACA0012 airfoil at the Reynolds number of 20 000.
引用
收藏
页码：293 / 305
页数：13
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