Space-Time Imaging Systems
Abstract
Particle image velocimetry systems have been acquired for acquisition of instantaneous images of unsteady separated flows. Images are acquired at a rate much higher than the characteristic frequency of these flows. This instrumentation has been employed to acquire and construct: (i) planar images; (ii) space-time volume images; and (iii) spatial volume images. Processing techniques allow determination of the flow topology, vorticity, and spectra and cross-spectra, based on simultaneous records at thousands of locations in the flow field. Collaboration with the Computational Sciences Branch at the Air Force Research Laboratory has yielded extensive experimental- numerical comparisons. Three doctoral students at Lehigh University have employed the acquired instrumentation. The overall objectives during specification of the instrumentation were to: optimize space-time imaging capabilities using different types of cameras with specific ranges of sensitivity and frame rate; attain a high rate of repetition of the pulsed laser system; and maintain compatibility with laser synchronizer systems and host computers deployed at different experimental locations in our laboratories. To meet these objectives, it was necessary to account for the rapidly evolving technologies associated with each of the aforementioned items. All objectives have been accomplished, and experimental advances have been already made on several projects.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 20, 2009
- Accession Number
- ADA584973
Entities
People
- Donald Rockwell
Organizations
- Lehigh University