Decibel Levels from Supersonic Jet (IMAGE)

American Institute of Physics

Decibel Levels from Supersonic Jet

Caption

Contours of decibel levels of the sound emitted from a supersonic jet. The nozzle exit is located at the magenta dot in each figure, and the jet flows from the nozzle to the right. Jet noise is computed using high-fidelity large eddy simulation (LES) in the top panel, using one wavepacket computed from the parabolized stability equations (PSE) in the middle panel, and through a superposition of input-output (I/O) modes from the new analysis technique in the bottom panel. While all three methods capture the peak jet noise at an angle of 30°, I/O modes also recover sideline noise as observed in the high-fidelity simulation.

Credit

Joseph W. Nichols /University of Minnesota

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