Title: Shock instability in an inclined underexpanded impinging jet

Description: Shadowgraph images captured at 1,000,000 frames per second show an underexpanded impinging jet of air with a nozzle pressure ratio (nozzle stagnation pressure divided by ambient pressure) of NPR=4.5, non-dimensional impingement distance of Z/D=2 (Where Z is the impingement distance and D is the nozzle diameter) and an impingement angle of 30 degrees. At this condition the jet is influenced by a an axially instability mode in which the upper portion of the shock is seen to deflect and oscillate.

Credits: Adam Risborg - Laboratory for Turbulence Research in Aerospace and Combustion, Department of Aerospace and Mechanical Engineering, Monash University

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Contributed By: Adam Risborg adam.risborg@gmail.com