CHARACTERIZATION OF HARTMANN TUBE FLOW WITH POROUS PRESSURE-SENSITIVE PAINT

The Hartmann tube is a device that generates highintensity sound through the oscillation of a shock wave. Shock oscillations are created by the flow of an underexpanded jet interacting with a resonance cavity. Recent interest in the Hartmann tube has focused on using the high-intensity sound for flow-control applications. In this work, pressure-sensitive paint (PSP) was used to characterize the unsteady flowfield of the Hartmann tube. PSP effectively resolved the shock oscillations at 12 kHz. Furthermore, PSP was used to measure propagating acoustic waves emanating from the Hartmann tube. This work provides new insight into the relationship between the unsteady fluid dynamics and acoustics of the Hartmann tube – including the nature of the shock oscillations, unsteady flow interaction with the resonance cavity, and directionality of the radiated sound.

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