Self-Suction-and-Jet Control in Flow Regime and Unsteady Force for a Single Box Girder
Publication: Journal of Bridge Engineering
Volume 24, Issue 8
Abstract
Self-suction-and-jet flow control is a passive flow control method involving self-organized suction at the leading edge and a wake jet at the trailing edge of a structure. In this study, it was used in a 1:125 physical model of the Great Belt East Bridge to decrease dynamic wind loads and modify the flow structure around the main girder. Experiments were performed in a wind tunnel at a wind speed of 12 m/s, yielding a Reynolds number of 2.8 × 104 for the height of the main girder model. The surface pressure (and therefore, the aerodynamic force) fluctuated less in the controlled models than in the uncontrolled model. The velocimetry data indicated that self-suction-and-jet flow control effectively changed the vortex shedding process in the wake of the model. The interactions between the self-organized jet flows and shear flows caused the trailing edge vortex shedding to transform from asymmetric to symmetric, eliminating the vortex shedding completely. Linear stability analysis of the mean wake flow structures indicated that self-suction-and-jet flow control pushed the unstable flow region farther downstream.
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Acknowledgments
This research work is funded by the National Nature Science Foundation of China (NSFC 51378153, 51578188, and 51722805), and the Fundamental Research Funds for the Central Universities (HITBRETIV.201803 and HITBRETIII.201512).
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Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 24 • Issue 8 • August 2019
Copyright
© 2019 American Society of Civil Engineers.
History
Received: Jul 1, 2018
Accepted: Feb 8, 2019
Published online: May 16, 2019
Published in print: Aug 1, 2019
Discussion open until: Oct 16, 2019
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