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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.
Source PublicationJOURNAL OF FLUIDS AND STRUCTURES
2016-01
Volume60Pages:130-142
ISSN0889-9746
AbstractAn 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.
KeywordMicro-air-vehicles (Mavs) Unsteady Aerodynamics Pitching Airfoil Pitch-pivot-point Location Piv
DOI10.1016/j.jfluidstructs.2015.10.014
URL查看原文
Indexed BySCI ; EI
Language英语
WOS IDWOS:000368753200008
WOS KeywordFLAPPING FOIL ; THICKNESS
WOS Research AreaEngineering ; Mechanics
WOS SubjectEngineering, Mechanical ; Mechanics
Funding OrganizationThe 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.
DepartmentLNM湍流
Classification二类/Q1
RankingFalse
Citation statistics
Cited Times:10[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/58636
Collection非线性力学国家重点实验室
Corresponding AuthorHu, H (reprint author), Iowa State Univ, Dept Aerosp Engn, Ames, IA 50010 USA.
Recommended Citation
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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