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Fast-framing ballistic imaging of velocity in an aerated spray
Optics Letters
  • David Sedarsky, Lund University
  • James Gord, Air Force Research Laboratory
  • Campbell Carter, Air Force Research Laboratory
  • Terrence R. Meyer, Iowa State University
  • Mark Linne, Lund University and Chalmers University
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We describe further development of ballistic imaging adapted for the liquid core of an atomizing spray. To fully understand spray breakup dynamics, one must measure the velocity and acceleration vectors that describe the forces active in primary breakup. This information is inaccessible to most optical diagnostics, as the signal is occluded by strong scattering in the medium. Ballistic imaging mitigates this scattering noise, resolving clean shadowgram-type images of structures within the dense spray region. We demonstrate that velocity data can be extracted from ballistic images of a spray relevant to fuel-injection applications, by implementing a simple, targeted correlation method for determining velocity from pairs of spray images. This work presents the first ballistic images of a liquid-fuel injector for scramjet combustion, and the first velocity information from ballistic images relevant to breakup in the near-field of a spray.

This article is from Optics Letters 34 (2009): 2748, doi: 10.1364/OL.34.002748. Posted with permission.

This paper was published in Optics Letters and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.
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Optical Society of America
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David Sedarsky, James Gord, Campbell Carter, Terrence R. Meyer, et al.. "Fast-framing ballistic imaging of velocity in an aerated spray" Optics Letters Vol. 34 Iss. 18 (2009) p. 2748 - 2750
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