Three-dimensional imaging of a turbulent jet using shearing interferometry and optical tomography |
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Authors: | B J Pelliccia-Kraft D W Watt |
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Institution: | (1) Mechanical Engineering Department University of New Hampshire Durham, NH 03824, USA, US |
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Abstract: | The 3-D density field of a round, neutrally buoyant turbulent jet is obtained using a finite-fringe, shearing interferometer.
A He–Ne laser beam (λ=632.8 nm) is subdivided into six beams of equal intensity, which intersect a helium–argon jet flowing
from a vertical nozzle. Two-dimensional projection data of the jet are captured simultaneously from six viewing directions
distributed over 140°. The desired phase is removed from the spatial carrier using the Fourier transform method. A tomographic
reconstruction technique, using a truncated Fourier–Bessel expansion is performed to obtain the complete 3-D density field.
The Reynolds number, based on the exit mean velocity and the nozzle diameter, is 5890.
Received: 22 December 1999/Accepted: 20 January 2000 |
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