Force moment partitioning and scaling analysis of vortices shed by a 2D pitching wing in quiescent fluid

IF 2.3 3区工程技术 Q2 ENGINEERING, MECHANICAL

Experiments in Fluids Pub Date : 2023-09-21 DOI:10.1007/s00348-023-03698-5

Yuanhang Zhu, Howon Lee, Sushrut Kumar, Karthik Menon, Rajat Mittal, Kenneth Breuer

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引用次数: 1

Abstract

We experimentally study the dynamics and strength of vortices shed from a NACA 0012 wing undergoing sinusoidal pitching in quiescent water. We characterize the temporal evolution of the vortex trajectory and circulation over a range of pitching frequencies, amplitudes and pivot locations. By employing a physics-based force and moment partitioning method (FMPM), we estimate the vortex-induced aerodynamic moment from the velocity fields measured using particle image velocimetry. The vortex circulation, formation time and vorticity-induced moment are shown to follow scaling laws based on the feeding shear-layer velocity. The vortex dynamics, together with the spatial distribution of the vorticity-induced moment, provide quantitative explanations for the nonlinear behaviors observed in the fluid damping (Zhu et al. in J Fluid Mech, 923:R2, 2021). The FMPM-estimated moment and damping are shown to match well in trend with direct force measurements, despite a discrepancy in magnitude. Our results demonstrate the powerful capability of the FMPM in dissecting experimental flow field data and providing valuable insights into the underlying flow physics.

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静止流体中二维变桨机翼旋涡的力矩划分和比例分析

我们通过实验研究了NACA 0012机翼在静水中进行正弦俯仰时产生的涡流的动力学和强度。我们描述了旋涡轨迹和环流在一系列俯仰频率、振幅和枢轴位置上的时间演变。通过采用基于物理的力和力矩划分方法（FMPM），我们从粒子图像测速仪测量的速度场中估计了涡流引起的气动力矩。基于进料剪切层速度，旋涡环流、形成时间和涡度诱导矩遵循标度定律。涡流动力学以及涡度诱导力矩的空间分布为流体阻尼中观察到的非线性行为提供了定量解释（Zhu et al.in J fluid Mech，923:R22021）。FMPM估计的力矩和阻尼与直接力测量的趋势非常匹配，尽管大小存在差异。我们的结果证明了FMPM在解析实验流场数据方面的强大能力，并为潜在的流动物理提供了有价值的见解。

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来源期刊

Experiments in Fluids 工程技术-工程：机械

CiteScore

5.10

自引率

12.50%

发文量

157

审稿时长

3.8 months

期刊介绍： Experiments in Fluids examines the advancement, extension, and improvement of new techniques of flow measurement. The journal also publishes contributions that employ existing experimental techniques to gain an understanding of the underlying flow physics in the areas of turbulence, aerodynamics, hydrodynamics, convective heat transfer, combustion, turbomachinery, multi-phase flows, and chemical, biological and geological flows. In addition, readers will find papers that report on investigations combining experimental and analytical/numerical approaches.