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Aerodynamic study of a 3D backward facing double step applied to safer launch and recovery of helicopters on ships

Abstract : This study is concerned about the safety of helicopter launch and recovery on frigates. Therefore, it consists in investigating the airwake of a simplified frigate, modeled by a 3D backward facing double step in order to have a better understanding of such 3D unsteady flows. The mean and fluctuating velocity fields have been analyzed mainly experimentally through PIV, hot-wire anemometry, oil-flow visualizations . . . This has enabled to observe 3D structures, confirmed by a numerical computation. In particular, the results show a mean flow asymmetry. A sensitivity study around the zero degree drift angle has shown that the flow is bi-stable for this geometry. This bi-stability has been observed in several wind-tunnels for a wide variety of upstream geometric conditions. The understanding of this phenomenon is required for future control of such complex flows.
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Contributor : Benjamin Herry <>
Submitted on : Saturday, December 10, 2011 - 1:10:19 PM
Last modification on : Tuesday, March 26, 2019 - 2:20:08 PM
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  • HAL Id : tel-00650410, version 1

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Benjamin Herry. Aerodynamic study of a 3D backward facing double step applied to safer launch and recovery of helicopters on ships. Mechanics of the fluids [physics.class-ph]. Université de Valenciennes et du Hainaut-Cambresis, 2010. English. ⟨NNT : 10/47⟩. ⟨tel-00650410⟩

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