Vortex flow aerodynamics behind a symmetric airfoil at low angles of attack and Reynolds numbers

IF 1.5 4区工程技术 Q2 ENGINEERING, AEROSPACE

International Journal of Micro Air Vehicles Pub Date : 2021-01-01 DOI:10.1177/17568293211055653

D. Kurtulus

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引用次数: 4

Abstract

The low Reynolds number aerodynamics is important to investigate for micro air vehicle applications. The current paper covers numerical simulations to present the downstream development of the wake patterns and detailed analysis of the vortices generated at the downstream of NACA 0012 airfoil around the critical angle of attack where the instantaneous vortex patterns are oscillatory and differ from the mean vortex pattern for low Reynolds numbers ranging from 1000 to 4000. The instantaneous and mean aerodynamic forces, pressure and skin friction coefficients, and vorticity values are compared in addition to the path of the vortex centers, their longitudinal and lateral spacings, Kármán spacing ratios, and distortion ratios at the wake of the airfoil in regard to the different Reynolds numbers investigated. The streamwise and crosswise velocities of the vortex cores and relative velocities at different transverse locations are also discussed and presented in detail. The correlations between different non-dimensional numbers (St, Re, Ro) are obtained at these low Reynolds numbers investigated.

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对称翼型在低攻角和雷诺数下的涡流空气动力学

低雷诺数空气动力学对于微型飞行器的研究具有重要意义。目前的论文涵盖了数值模拟，以呈现尾迹模式的下游发展，并详细分析了NACA 0012翼型下游在临界迎角周围产生的涡，其中瞬时涡型是振荡的，不同于低雷诺数范围从1000到4000的平均涡型。瞬时和平均气动力、压力和表面摩擦系数、涡量值以及涡中心路径、纵向和横向间距、Kármán间距比和不同雷诺数下翼型尾迹的畸变比进行了比较。并详细讨论了涡旋核的流向速度和横向速度以及不同横向位置的相对速度。不同的无量纲数(St, Re, Ro)之间的相关性在这些低雷诺数研究得到。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Micro Air Vehicles ENGINEERING, AEROSPACE-

CiteScore

3.00

自引率

7.10%

发文量

审稿时长

>12 weeks

期刊介绍： The role of the International Journal of Micro Air Vehicles is to provide the scientific and engineering community with a peer-reviewed open access journal dedicated to publishing high-quality technical articles summarizing both fundamental and applied research in the area of micro air vehicles.