Ballistic Holography under Realistic Spray Conditions
Abstract
In summer 2016 UC-Irvine and Metrolaser, Inc. completed a three year National Science Foundation funded Grant Opportunities for Academic Liaison with Industry (GOALI) project and successfully developed and demonstrated a unique, femtosecond, digital holography system for characterizing dense sprays under harsh conditions. The NSF project was successful beyond expectations in providing the fundamental understanding of the technique and demonstration in s11rrogate systems but it did not reach the stage of demonstration under fully rel l listic sprl ly conclitions. We propo. c to use A RO Support to heavily leverage our findings from the GOA LI project and extend its impact by including a substantial demonstration phase with the support of colleagues at the Colorado School of Mines (CSM). This project brings together three research teams with complementary skills comprising optical diagnostics, particularly ballistic imaging and holography, and high-pressure sprays for a unique opportunity to advance Lhe state-of-the-art in spray dynamics imaging. This work is directly relevant to the large field of study addressing spray dynamics and fundamentals including, but not limited to, jet breakup at orifices and ligament formation. An imaging solution to address the lack of data available near the injector orifice for dense sprays has been in high demand for decades from the spray community. The currently available diagnostics anempting ro address this need are limited to ballistic photon imaging (e.g., Linne et al., 2005) and synchrotron x-ray radiography (e.g., Cai et al., 2003). Recent results at CSM have acquired planar image slices from sections of a spray; these images do not include correction for out of plane signal addition from multiple scattering and only two planes can be interrogated simultaneously. For all of these efforts, the capability to resolve the instantenaous and full 30 structure of sprays is not present. Suppressing multiple scattering noise in the frequency domain via ultrashort pulsed off-ax.is digital holography (USPODH) has the potential to provide this significant improvement to the measurements of sprays in the near field, as we have already demonstrated in the GOALI proof-ofconcept research (Ziaee, et al., 2016). We are proposing an Army Research Office sponsored extension of our existing ultrashort pulsed holography project co support focused field tests and measurements on a Diesel Simulator at Colorado School of Mines (CSM).
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jan 12, 2017
- Source ID
- W911NF1710061
Entities
People
- Derek Dunn-rankin
Organizations
- Army Contracting Command
- United States Army
- University of California, Irvine