Supersonic Underexpanded Jet Features Extracted from Modal Analyses of High-Speed Optical Diagnostics

What is it about?

Under certain conditions, the exhaust flow from a supersonic nozzle can exhibit a very loud and flow changing feature known as screech. Jet screech has traditionally been studied primarily with microphones and other flow-intrusive tools. Here, we perform experiments on a screeching jet using optical techniques, which do not enter and disrupt the flow-field. These optical techniques are found to be highly valid for identifying screech and the altered flow structure that accompanies it.

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