Self-Suction and Self-Jet Control on Wind Loads and Turbulent Flow Structures over a Circular Cylinder
Publication: Journal of Aerospace Engineering
Volume 32, Issue 1
Abstract
An experimental study on a passive, self-suction, and self-jet control method was conducted to manipulate the flow around a circular cylinder at the Reynolds number . The influence of the spacing of the passive bypass jet rings on the aerodynamic forces and flow structures was investigated in detail. The results indicate that the aerodynamic forces acting on the cylinder increase with distance from the jet rings until reaching a critical distance. The critical spacing ratio, , is approximately 2.69 for the convex surface case (Case 1) and for the plane surface case (Case 2). Compared to a bare cylinder, the fluctuations of the lift coefficient and mean drag coefficient are reduced by approximately 94.61% and 33.18%, respectively, when (the most effective case) due to the stable wake and reduction of the dissipation of turbulent kinetic energy in the near wake, as well as the extra energy input by the flow from the outlet holes.
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Acknowledgments
This work is funded by the National Key Research and Development Program of China (2016YFC0701107); the National Natural Science Foundation of China through Grant Nos. 51378153, 51578188 and 51722805, and the Fundamental Research Funds for the Central Universities (HIT. BRETIII. 201512 and HITBRETIV. 201803).
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Published In
Journal of Aerospace Engineering
Volume 32 • Issue 1 • January 2019
Copyright
©2018 American Society of Civil Engineers.
History
Received: Feb 2, 2018
Accepted: Jul 9, 2018
Published online: Oct 30, 2018
Published in print: Jan 1, 2019
Discussion open until: Mar 30, 2019
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