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

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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
刊名	JOURNAL OF FLUIDS AND STRUCTURES
	2016-01
通讯作者邮箱	huhui@iastate.edu
卷号	60 页码:130-142
关键词	Micro-Air-Vehicles (MAVs) Unsteady Aerodynamics Pitching Airfoil Pitch-pivot-point Location PIV
ISSN号	0889-9746
通讯作者	Hu, H (reprint author), Iowa State Univ, Dept Aerosp Engn, Ames, IA 50010 USA.
产权排序	[Tian, Wei; Liu, Hong; Wu, James C.] Shanghai Jiao Tong Univ, Sch Aeronaut & Astronaut, Ctr Aerodynam, Shanghai 200240, Peoples R China; [Tian, Wei; Bodling, Andrew; Hu, Hui] Iowa State Univ, Dept Aerosp Engn, Ames, IA 50010 USA; [He, Guowei] Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
中文摘要	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.
分类号	二类/Q1
类目[WOS]	Engineering, Mechanical ; Mechanics
研究领域[WOS]	Engineering ; Mechanics
关键词[WOS]	FLAPPING FOIL ; THICKNESS
收录类别	SCI ; EI
原文出处	http://dx.doi.org/10.1016/j.jfluidstructs.2015.10.014
语种	英语
WOS记录号	WOS:000368753200008
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/58636]
专题	力学研究所_非线性力学国家重点实验室
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.