SUPERSONIC JET AEROACOUSTICS
This picture illustrates the use of Schlieren to study the dynamical properties of a supersonic jet flow. The jet was created by operating a rectangular nozzle overexpanded in the National Center for Physical Acoustics Aeroacoustics Laboratory. The Schlieren provides optical information with respect to the second derivative of the density field and is a useful technique particularly when studying shock-containing jets. As can be seen on the monitor, the wavy motion of the resonating jet due to its natural screech cycle has been captured. This technique can be used to determine the effectiveness of novel nozzle configurations designed to create resonance at preferred frequencies.
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