Measurements of a Mach 3 jet using high-speed optical flow techniques

Citation:

J. A. Valdez and Tinney, C. E., “Measurements of a Mach 3 jet using high-speed optical flow techniques,” AIAA/CEAS Aeroacoustics Conference, AIAA Paper 2018-3148. Atlanta, Georgia, USA, 2018.

Abstract:

The design and construction of various high-speed digital optical flow techniques for
studying the aeroacoustics and turbulence dynamics, as it relates to supersonic/hypersonic
flow phenomena, is discussed. The three systems comprise retroreflective shadowgraphy, a z-type schlieren and a focused schlieren system. The performance of the three systems are examined using an axisymmetric Mach 3 flow, which has received considerable attention at the University of Texas at Austin for understanding the sound produced by flows with supersonic convective acoustic Mach numbers. Various techniques to aid in the setup of optical elements in conjunction with the high resolution digital cameras, capable of producing a million frames per second, are described. Various analysis methods are then employed (wavenumer-frequency transforms and wavelet analysis) to quantify the dynamical nature of the flow and sound field produced by this supersonic nozzle.

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