Compressible vortex loops: effect of nozzle geometry

Zare-Behtash, H. , Kontis, K. , Gongora-Orozco, N. and Takayama, K. (2009) Compressible vortex loops: effect of nozzle geometry. International Journal of Heat and Fluid Flow, 30(3), pp. 561-576. (doi: 10.1016/j.ijheatfluidflow.2009.02.022)

Abstract

Vortex loops are fundamental building blocks of supersonic free jets. Isolating them allows for an easier study and better understanding of such flows. The present study looks at the behaviour of compressible vortex loops of different shapes, generated due to the diffraction of a shock wave from a shock tube with different exit nozzle geometries. These include a 15 mm diameter circular nozzle, two elliptical nozzles with minor to major axis ratios of 0.4 and 0.6, a 30 × 30 mm square nozzle, and finally two exotic nozzles resembling a pair of lips with minor to major axis ratios of 0.2 and 0.5. The experiments were performed for diaphragm pressure ratios of P4/P1=4, 8, and 12, with P4 and P1 being the pressures within the high pressure and low pressure compartments of the shock tube, respectively. High-speed schlieren photography as well as PIV measurements of both stream-wise and head-on flows have been conducted.

• Item Type: Articles (Editorial)
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Zare-Behtash, Dr Hossein and Kontis, Professor Konstantinos
• Authors: Zare-Behtash, H., Kontis, K., Gongora-Orozco, N., and Takayama, K.
• College/School: College of Science and Engineering > School of Engineering > Autonomous Systems and Connectivity
• Journal Name: International Journal of Heat and Fluid Flow
• Publisher: Elsevier
• ISSN: 0142-727X
• ISSN (Online): 1879-2278
• Copyright Holders: Copyright © 2009 Elsevier
• First Published: First published in International Journal of Heat and Fluid Flow 30(3):561-576
• Publisher Policy: Reproduced in accordance with the copyright policy of the publisher