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Measurement of the flow structures in the wakes of different types of parachute canopies

Acta Mechanica Sinica 2018年第2期34卷 225-237页

作者： sylvio pasqualini Zheyan Jin Zhigang Yang School of Aerospace Engineering and Applied Mechanics Tongji UniversityShanghai 200092China Shanghai Key Lab of Vehicle Aerodynamics and Vehicle Thermal Management Systems Shanghai 201804China

We measured flow structures with stereoscopic particle image velocimetry(stereo-PIV) in the turbulent wakes of three parachute canopies, which had the same surface area, but different geometries. The tested parachute canopies included ribbon canopy, 8-branches canopy, and cross canopy. The obtained results showed that the geometry of the parachute canopies had significant influences on the flow structures in the wakes of these three canopies. In addition, the variation of Reynolds number did not lead to a dramatic change in the distributions of velocity, vorticity,Reynolds stress, and turbulent kinetic energy.

关键词： Parachute canopies Wake structures Particle image velocimetry

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Experimental investigation of the effect of Reynolds number on flow structures in the wake of a circular parachute canopy

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Acta Mechanica Sinica 2014年第3期30卷 361-369页

作者： Zhe-Yan Jin sylvio pasqualini Bo Qin School of Aerospace Engineering and Applied Mechanics Tongji University Institute of Unmanned Aircraft System Beihang University

In the present study, an experimental study was conducted to characterize the effect of Reynolds number on flow structures in the turbulent wake of a circular parachute canopy by utilizing stereoscopic particle image velocime- try （Stereo-PIV） technique. The parachute model tested in the present study was attached by 28 nylon suspension lines and placed horizontally at the test section center of the wind tunnel. The obtained results showed that with the in- crease of Reynolds number, the intensities of the vortices near the downstream region of the canopy skirt were found to increase accordingly. However, the increase of Reynolds number did not result in a significant change in ensemble- averaged normalized x-component of the velocity, ensembleaveraged normalized vorticity, normalized Reynolds stress, and normalized turbulent kinetic energy distributions in the turbulent wake of the circular parachute canopy. The obtained results are very useful to further our understanding about the unsteady aerodynamics in the wake of flexible circular parachute canopies and to constitute a reference for CFD computation.

关键词： Stereo-PIV Circular parachute - Canopy Flexible Turbulent wake

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