Abstract
The physics of compressible vortex loops generated due to the rolling up of the shear layer upon the diffraction of a shock wave from a shock tube is far from being understood, especially when shock-vortex interactions are involved. This is mainly due to the lack of global quantitative data available which characterizes the flow. The present study involves the usage of the PIV technique to characterize the velocity and vorticity of compressible vortex loops formed at incident shock Mach numbers ofM=1.54 and1.66. Another perk of the PIV technique over purely qualitative methods, which has been demonstrated in the current study, is that at the same time the results also provide a clear image of the various flow features. Techniques such as schlieren and shadowgraph rely on density gradients present in the flow and fail to capture regions of the flow influenced by the primary flow structure which would have relatively lower pressure and density. Various vortex loops, namely, square, elliptic and circular, were generated using different shape adaptors fitted to the end of the shock tube. The formation of a coaxial vortex loop with opposite circulation along with the generation of a third stronger vortex loop ahead of the primary with same circulation direction are of the interesting findings of the current study.
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Hossein Zare-Behtash: He received his BEng (Hons) in Aerospace Engineering in 2005 from the University of Manchester Institute of Science and Technology (UMIST) in the UK, and is currently a final year PhD student at the University of Manchester. His current research interests are Pressure-Sensitive Paints (PSP), experimental studies on compressible vortex loops using high-speed photography, schlieren (color / black and white), shadowgraphy, PIV and PSP techniques.
Nalleli Gongora-Orozco . She recived her BEng in Mechanical Engineering in 2002 from the Metropolitan Autonomous University in Mexico. She obtained her MSc degree in Theoretical and Applied Fluid Dynamics from the University of Manchester in 2005. Currently she is studying internal shock wave interactions as part of her PhD in Aerospace Engineering at the University of Manchester.
Konstantinos Kontis: He is a Reader of Fluid Dynamics and Ground Testing Technology, and the Head of the Aerospace Research Group and Aero-Physics Laboratory at the University of Manchester, School of MACE, UK. He received his BEng (Hons) in Aeronautics, University of Bristol, UK (1993), and MSc and PhD in Aerodynamics, College of Aeronautics, Cranfield University, UK (1994, 1997). He is Chartered Engineer (2000), Hellenic Technical Chamber, Greece, and Eur.Ing. (2006), FEANI, Brussels, Belgium. He is Executive Member of the International Shock Wave Institute (2007) and member of the International Advisory Committee of ISSW. His present interests include: fundamental studies on incompressible and compressible flow structures and interactions, flow control of subsonic, transonic and hypersonic flows, development of optical imaging systems for aerospace applications, and interdisciplinary shock wave related phenomena and interactions.
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Zare-Behtash, H., Gongora-Orozco, N. & Kontis, K. Global visualization and quantification of compressible vortex loops. J Vis 12, 233–240 (2009). https://doi.org/10.1007/BF03181861
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DOI: https://doi.org/10.1007/BF03181861