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Optical Flow Path
Measurements
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PIV is a planar measurement technique wherein a pulsed laser light sheet is used to illuminate a flow field seeded with tracer particles small enough to accurately follow the flow. The positions of the particles are recorded on digital CCD cameras at each instant the light sheet is pulsed. The processed data yields the instantaneous velocity field across the illuminated plane in the flow. The figure to the left depicts a dual PIV system setup in an aeroacoustic test facility.
POCs: Mark P Wernet, Tony Opalski, Trevor John
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Gas velocity, density, and temperature measurements are obtained using spectrally resolved Rayleigh scattering diagnostics. A Fabry-Perot Interferometer is used to analyze the spectrum of monochromatic light scattered from molecules in the probe volume. No seeding of the flow is necessary.
POCs: Amy Mielke, Kristie Elam
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Advanced laser-based diagnostics processing techniques yield 3-dimensional visualization of species concentration. Planar laser-induced fluorescence is used for 3-D visualization of fuel, OH, and NO. Planar laser scattering is used for 3-D visualization of fuel spray in liquid phase. Raman scattering is used for 2-D measurement of Raman active species such as water, hydrogen, fuel, and air.
POC: Robert Anderson
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