An experimental study of the effects of pitch-pivot-point location on the propulsion performance of a pitching airfoil

doi:10.1016/j.jfluidstructs.2015.10.014

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	An experimental study of the effects of pitch-pivot-point location on the propulsion performance of a pitching airfoil
	Tian W; Bodling A; Liu H; Wu JC; He GW(何国威); Hu H; Hu, H (reprint author), Iowa State Univ, Dept Aerosp Engn, Ames, IA 50010 USA.
发表期刊	JOURNAL OF FLUIDS AND STRUCTURES
	2016-01
卷号	60 页码:130-142
ISSN	0889-9746
摘要	An experimental investigation was conducted to characterize the evolution of the unsteady vortex structures in the wake of a pitching airfoil with the pitch-pivot-point moving from 0.16C to 0.52C (C is the chord length of the airfoil). The experimental study was conducted in a low-speed wind tunnel with a symmetric NACA0012 airfoil model in pitching motion under different pitching kinematics (i.e., reduced frequency k=3.8-13.2). A high-resolution particle image velocimetry (PIV) system was used to conduct detailed flow field measurements to quantify the characteristics of the wake flow and the resultant propulsion performance of the pitching airfoil. Besides conducting "free-run" Ply measurements to determine the ensemble-averaged velocity distributions in the wake flow, "phase-locked" PIV measurements were also performed to elucidate further details about the behavior of the unsteady vortex structures. Both the vorticity-moment theorem and the integral momentum theorem were used to evaluate the effects of the pitch-pivot point location on the propulsion performance of the pitching airfoil. It was found that the pitch-pivot-point would affect the evolution of the unsteady wake vortices add resultant propulsion performance of the pitching airfoil greatly. Moving the pitch-pivot-point of the pitching airfoil can be considered as adding a plunging motion to the original pitching motion. With the pitch-pivot-point moving forward (or backward), the added plunging motion would make the airfoil trailing edge moving in the same (or opposite) direction as of the original pitching motion, which resulted in the generated wake vortices and resultant thrust enhanced (or weakened) by the added plunging motion. (C) 2015 Elsevier Ltd. All rights reserved.
关键词	Micro-air-vehicles (Mavs) Unsteady Aerodynamics Pitching Airfoil Pitch-pivot-point Location Piv
DOI	10.1016/j.jfluidstructs.2015.10.014
URL	查看原文
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000368753200008
关键词[WOS]	FLAPPING FOIL ; THICKNESS
WOS研究方向	Engineering ; Mechanics
WOS类目	Engineering, Mechanical ; Mechanics
项目资助者	The support from National Science Foundation, United States (NSF) with Grant No. of IRES-1064235 and Opening fund of State Key Laboratory of Nonlinear Mechanics, Chinese Academy of Sciences, China are gratefully acknowledged.
课题组名称	LNM湍流
论文分区	二类/Q1
力学所作者排名	False
引用统计	被引频次：46[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/58636
专题	非线性力学国家重点实验室
通讯作者	Hu, H (reprint author), Iowa State Univ, Dept Aerosp Engn, Ames, IA 50010 USA.
推荐引用方式 GB/T 7714	Tian W,Bodling A,Liu H,et al. An experimental study of the effects of pitch-pivot-point location on the propulsion performance of a pitching airfoil[J]. JOURNAL OF FLUIDS AND STRUCTURES,2016,60:130-142.
APA	Tian W.,Bodling A.,Liu H.,Wu JC.,何国威.,...&Hu, H .(2016).An experimental study of the effects of pitch-pivot-point location on the propulsion performance of a pitching airfoil.JOURNAL OF FLUIDS AND STRUCTURES,60,130-142.
MLA	Tian W,et al."An experimental study of the effects of pitch-pivot-point location on the propulsion performance of a pitching airfoil".JOURNAL OF FLUIDS AND STRUCTURES 60(2016):130-142.

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