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Sensors 2014, 14(12), 23462-23489; doi:10.3390/s141223462

Penetration Characteristics of Air, Carbon Dioxide and Helium Transverse Sonic Jets in Mach 5 Cross Flow

1
Aerospace Sciences Division, School of Engineering, University of Glasgow, Glasgow G12 8QQ, UK
2
Department of Aerospace Eng'rg, Indian Institute of Science, Bangalore 560012, India
*
Author to whom correspondence should be addressed.
Received: 16 April 2014 / Revised: 11 September 2014 / Accepted: 10 November 2014 / Published: 8 December 2014
(This article belongs to the Special Issue Acoustic Waveguide Sensors)
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Abstract

An experimental investigation of sonic air, CO2 and Helium transverse jets in Mach 5 cross flow was carried out over a flat plate. The jet to freestream momentum flux ratio, J, was kept the same for all gases. The unsteady flow topology was examined using high speed schlieren visualisation and PIV. Schlieren visualisation provided information regarding oscillating jet shear layer structures and bow shock, Mach disc and barrel shocks. Two-component PIV measurements at the centreline, provided information regarding jet penetration trajectories. Barrel shocks and Mach disc forming the jet boundary were visualised/quantified also jet penetration boundaries were determined. Even though J is kept the same for all gases, the penetration patterns were found to be remarkably different both at the nearfield and the farfield. Air and CO2 jet resulted similar nearfield and farfield penetration pattern whereas Helium jet spread minimal in the nearfield. View Full-Text
Keywords: Flows and jets through nozzles; velocity measurements; visualization and imaging Flows and jets through nozzles; velocity measurements; visualization and imaging
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Erdem, E.; Kontis, K.; Saravanan, S. Penetration Characteristics of Air, Carbon Dioxide and Helium Transverse Sonic Jets in Mach 5 Cross Flow. Sensors 2014, 14, 23462-23489.

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