title: Penetration Characteristics of Air, Carbon Dioxide and Helium Transverse Sonic Jets in Mach 5 Cross Flow.
abstract: An experimental investigation of sonic air, CO2and 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 CO2jet resulted similar nearfield and farfield penetration pattern whereas Helium jet spread minimal in the nearfield.
authors.affiliation: Aerospace Sciences Division, School of Engineering, University of Glasgow, Glasgow G12 8QQ, UK. erincerdem@gmail.com.
authors.forename: Erinc
authors.initials: E
authors.lastname: Erdem
authors.affiliation: Aerospace Sciences Division, School of Engineering, University of Glasgow, Glasgow G12 8QQ, UK. Kostas.Kontis@glasgow.ac.uk.
authors.forename: Konstantinos
authors.initials: K
authors.lastname: Kontis
authors.affiliation: Department of Aerospace Eng'rg, Indian Institute of Science, Bangalore 560012, India. saravan@aero.iisc.ernet.in.
authors.forename: Selvaraj
authors.initials: S
authors.lastname: Saravanan