Optimal reduced frequency for the power efficiency of a flat plate gliding with spanwise oscillations

doi:10.1063/5.0071088

CORC > 力学研究所 > 中国科学院力学研究所 > 非线性力学国家重点实验室

	Optimal reduced frequency for the power efficiency of a flat plate gliding with spanwise oscillations
	Wang CY(王春雨); Zhao Y(昭越); Zhang XL(张鑫磊); Wang SZ(王士召)
刊名	PHYSICS OF FLUIDS ; 11
	2021-11
卷号	33 页码:111908
ISSN号	1070-6631
DOI	10.1063/5.0071088
英文摘要	The spanwise oscillation provides an accessory or alternative to flapping motion toward high-efficiency bio-inspired flight. The power factor that measures the efficiency of a gliding wing with spanwise oscillation to support a unit weight is investigated in this work. The gliding wing model consists of a rectangular flat plate that oscillates sinusoidally along the spanwise direction in a uniform upstream flow at a post-stall angle of attack. The unsteady flows and aerodynamic forces are obtained by numerically solving the incompressible Navier-Stokes equations at a Reynolds number of 300 (based on the uniform upstream velocity and the chord length). It is found that the spanwise oscillation can effectively enhance the power factor of the rectangular wing. The power factor under the optimal spanwise oscillation is 1.97 times as large as that without spanwise oscillation. Then, we introduce an effective reduced frequency by accounting for the effect of spanwise oscillation on the velocity encountered by the wing. The results show that the optimal effective reduced frequency locates in a narrow region from 0.47 to 0.56. Finally, the analyses of the vortex structures and the Lamb vector field indicate that the enhanced power factor results from the interaction between the stable leading-edge vortex and side-edge vortices associated with the spanwise oscillation. This work is expected to be helpful in understanding the vortex dynamics and guiding the kinematic design of the high-efficiency bio-inspired flight with spanwise oscillation.
学科主题	Mechanics ; Physics, Fluids & Plasmas
分类号	一类/力学重要期刊
语种	英语
WOS记录号	WOS:000723139500002
资助机构	National Natural Science Foundation of China [11922214, 91752118]
其他责任者	Wang, SZ (corresponding author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China. ; Wang, SZ (corresponding author), Univ Chinese Acad Sci, Sch Engn Sci, Beijing 101408, Peoples R China.
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/90252]
专题	力学研究所_非线性力学国家重点实验室
作者单位	1.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 101408, Peoples R China 2.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Wang CY,Zhao Y,Zhang XL,et al. Optimal reduced frequency for the power efficiency of a flat plate gliding with spanwise oscillations[J]. PHYSICS OF FLUIDS, 11,2021,33:111908.
APA	王春雨,昭越,张鑫磊,&王士召.(2021).Optimal reduced frequency for the power efficiency of a flat plate gliding with spanwise oscillations.PHYSICS OF FLUIDS,33,111908.
MLA	王春雨,et al."Optimal reduced frequency for the power efficiency of a flat plate gliding with spanwise oscillations".PHYSICS OF FLUIDS 33(2021):111908.