University of Khartoum

Study of the aerodynamics of translating spinning discs in laminar and turbulent flow

Study of the aerodynamics of translating spinning discs in laminar and turbulent flow

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Title: Study of the aerodynamics of translating spinning discs in laminar and turbulent flow
Author: Khalid Moukhtar, Hanaa
Abstract: The objective of the work is to study the aerodynamic characteristics of spinning translating axi-symmetric discs in steady laminar and turbulent flows. Applications of this nature are fundamental in unmanned air vehicles (UAVs) and sport. The effect of varying Reynolds number and the spin ratio was reported. Also, the study included analytical and computational studies of the flow around translating spinning discs. Further, a coin-shaped disc with a thickness to diameter ratio 0.1 in laminar and turbulent flows was simulated using ANSYS CFX 12.1. The moment coefficients were compared to experimental data in literature. The results were close to the experimental results in the range of Reynolds number examined. Laminar and turbulent flows around an oblate spheroid disc were simulated. The problem was tackled through the use of ANSYS CFX 12.1. First a laminar flow with Reynolds number 1.59E4 was simulated and aerodynamic loads and moments were calculated. Then turbulent flows with Reynolds number ranging from 5.13E6 to 1.03E7 were simulated. The angle of attack was varied in the range 0° to 30° and the spin ratio was varied in the range 0 to1. The results obtained show that the aerodynamic loads and moment coefficients are dependent on Reynolds number for the range of the Reynolds numbers simulated. It was observed that around Reynolds number 9.24E6 there was remarkable surge on the maximum lift to drag ratio. Otherwise, the effect of Reynolds number on this ratio was slight. For Reynolds number 9.24E6 the effect of spin ratio on the rolling moment coefficient was found to be slight. The remaining loads and moment coefficients were found to be not affected by the spin ratio. Pressure contour plots were presented for both upper and lower surface for the angles of attack mentioned.
URI: http://khartoumspace.uofk.edu/handle/123456789/9126
Date: 2015-04-20


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