Experimental study of measurement of free oscillations of a cylinder with fin in wind tunnel under different Reynolds

علوم کاربردی و محاسباتی در مکانیک

Article 4, Volume 35, Issue 4 - Serial Number 34, December 2023, Pages 47-62   

Document Type: Original Article

DOI: 10.22067/jacsm.2023.80578.1157

Authors

Hayatollah Adavi¹; Hassan Isvand²; Arash shams taleghani^{* 1}

¹Aerospace Research Institute, Tehran, Iran

²Department of Aerospace Engineering, Shahid Sattari Aeronautical University

Abstract

The purpose of this study is to investigate the behavior of a cylinder with three fins in the presence of free air flow. This study aims to investigate the unsteady aerodynamic flow with respect to its practical significance in aviation. Considering the degree of freedom of movement within the geometry and the complexity of the vortex masses that cause instability, it is essential to accurately predict the different dynamic behaviors. We have investigated the dynamic behavior of the model with different length ratios, free flow speeds, and angles of attack. According to the results of the study, rotational and oscillating behaviors, as well as a combination of both, are observed, and they are dependent upon the geometrical characteristics of the model, such as the ratio of the length of the plates to the radius of the cylinder, as well as the angle of attack When the aspect ratio and free flow speed are low, the motion pattern is damped around 60 degrees and the motion regime is oscillatory in nature, which changes to rotational motion as the aspect ratio and flow speed increase. The maximum oscillation or rotation is related to the initial angle of attack of zero degrees. It has been observed that rotational motion regimes occur with an increase in the longitudinal ratio and free flow speed at low initial angles of attack.

Keywords

Unsteady flow; Oscillatory and rotational movements; Reynolds number; Strouhal number

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