On the unsteady dynamics of partially shrouded compressible jets

We experimentally investigate a partially shrouded sonic jet (a free-jet shielded by solid wall-extension on one side) exiting from planar nozzle at two different pressure ratio ($\zeta=4$ and $5$). show that the inherent unsteadiness shock-induced flow separation wall emitted noise in far-field is strongly coupled through series of experiments like high-speed schlieren, wall-static pressure, unsteady spectra, microphone measurements. The jet's lateral free expansion also identified to be complicated, three-dimensional, produced directional. acoustic pulses flapping-jet, radiated wall, shock-shear layer interaction other side are responsible for generated disturbances. non-uniform aeroacoustic forcing top bottom portion wall-bounded shear leads self-sustained oscillation discrete sound emission. vital features proper orthogonal decomposition schlieren images supplemented