Acoustic and Flow Field characteristics of rectangular supersonic jet.

What is it about?

This study recorded acoustic data using microphones around a jet exiting from a 2:1 rectangular nozzle. The acoustic experiment was repeated in both the major and minor axis of the rectangular jet. The jet was operated at 5 conditions, two below ideal conditions, one at ideal conditions, two above ideal conditions. Optical laser experiment, known as PIV, was also performed on the exiting jet to study the velocity of the particles in the jet. The data from both experiments were analyzed and significant trends were noted. In the presence of shock cells and at non ideal conditions above ideal noise levels in the minor axis orientation, noise levels were significantly higher as compared to the other 4 operating conditions.

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Why is it important?

Non-axisymmetric jet nozzles have been shown to increase entrainment of ambient fluid which can lead to a reduction in noise levels. The non-axisymmetric geometry appear to have some superior characteristics over traditional circular nozzles.