Tomographic holographic interferometric study of self-excited compressible jet flows

Brenda H. Timmerman; David W. Watt

doi:10.1117/12.293396

21 November 1997 Tomographic holographic interferometric study of self-excited compressible jet flows

Brenda H. Timmerman, David W. Watt

Proceedings Volume 3172, Optical Technology in Fluid, Thermal, and Combustion Flow III; (1997) https://doi.org/10.1117/12.293396
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

Abstract

The study of a self-excited compressible jet using single and double-pulsed, phase-shifted interferometry in conjunction with a 9 beam tomographic illumination system is described. A plane wave holographic interferometer using a pulsed ruby laser has been adapted to provide multiple illumination directions of a volume that is approximately 4 centimeters on a side. This set-up is being used to study the transient behavior of compressible jets and may be operated using double-exposure holographic interferometry to study the instantaneous behavior of the flow; alternatively, the system may ge operated in a double-pulse mode to study the fluctuations in the flow. The tomographic reconstructions are made using a Fourier-Bessel expansion. To illustrate the performance of the system, an oscillating pipe-collar nozzle flow producing a wavy flow pattern was studied. The instantaneous measurements show the flow to be oscillating in one plane, whereas from the differential results it is found that this plane is rotating during the oscillation period.

Citation Download Citation

Brenda H. Timmerman and David W. Watt "Tomographic holographic interferometric study of self-excited compressible jet flows", Proc. SPIE 3172, Optical Technology in Fluid, Thermal, and Combustion Flow III, (21 November 1997); https://doi.org/10.1117/12.293396

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