Numerical investigation on buffeting and lock-in phenomenon for biplane airfoils at alpha=40 degrees

doi:10.1016/j.ijmecsci.2022.107120

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	Numerical investigation on buffeting and lock-in phenomenon for biplane airfoils at alpha=40 degrees
	R. Guo; Y. Bai; Z. Qiao; X. Pei and G. Wu
	2022
发表期刊	International Journal of Mechanical Sciences
ISSN	207403
卷号	219
摘要	Biplane airfoils at high angles of attack have interesting nonlinear characteristics, the purpose of this work is to evaluate the impacts of spacing ratio (=ds/c=0.25, 0.5, 1, 2 and 4, where ds is the vertical distance between biplane airfoils and c is chord length) and Reynolds number (0.87105Re4.35105) on buffeting and lock-in phenomenon at angle of attack =40 throughout numerical investigation. Present simulation results show that biplane configuration usually can reduce buffeting frequency slightly comparing to the single airfoil, yet reasonable spacing =2 is helpful to suppress buffeting and continuous acceleration also promotes stability. Particular attention is paid to stagnation point region that moves away from leading edge of the upper airfoil with increasing . However, the lower airfoil corresponds to the fixed stagnation point region. Additionally, limit cycle oscillation (LCO) of biplane airfoils is determined by pitching angles (), and in consideration of spacing effect, limit cycles of the lower airfoil move downward but those of the upper airfoil move in the opposite direction. Moreover, the shape of limit cycle for the later first collapses then inflates. Unique 8-shaped hysteresis of the upper airfoil in =1 is caused by sporadically wake interference. On the whole, V-shaped lock-in region will expand and shift left to some extent based on in contrast to the single airfoil. In terms of area, lock-in region shrinks then expands with rising , and the proportion of the left part increases as increases. 2022 Elsevier Ltd
DOI	10.1016/j.ijmecsci.2022.107120
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收录类别	ei
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文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/67264
专题	中国科学院长春光学精密机械与物理研究所
推荐引用方式 GB/T 7714	R. Guo,Y. Bai,Z. Qiao,et al. Numerical investigation on buffeting and lock-in phenomenon for biplane airfoils at alpha=40 degrees[J]. International Journal of Mechanical Sciences,2022,219.
APA	R. Guo,Y. Bai,Z. Qiao,&X. Pei and G. Wu.(2022).Numerical investigation on buffeting and lock-in phenomenon for biplane airfoils at alpha=40 degrees.International Journal of Mechanical Sciences,219.
MLA	R. Guo,et al."Numerical investigation on buffeting and lock-in phenomenon for biplane airfoils at alpha=40 degrees".International Journal of Mechanical Sciences 219(2022).

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