X-ray Imaging of Shock Waves Generated by High-Pressure Fuel Sprays
Time-resolved radiographic images of fuel
sprays and attendant shock waves for time
instances from 38 to of 192 µs after
injection start. (A.G. MacPhee et al).
At SRI-CAT (Advanced Photon Source) and the Cornell High Energy Synchrotron Source, synchrotron x-radiography and a fast x-ray detector were used to record the time evolution of transient fuel sprays from a high-pressure injector, capturing the propagation of spray-induced shock waves in a gaseous medium and revealing the complex nature of the spray hydrodynamics. The x-radiographs also allow quantitative analysis of shock waves that is nearly impossible with optical imaging. Under injection conditions similar to those found in operating engines, the fuel jets can exceed supersonic speeds and result in gaseous shock waves. This work sets the stage for study of the entire range of fluid dynamics inside and close to high-pressure liquid sprays. The methods used here may also be applied to the characterization of highly transient phenomena in optically dense materials.
Andrew G. MacPhee(1), Mark W. Tate (3), Christopher F. Powell (1), Yong Yue (2), Matthew J. Renzi (3), Alper Ercan (3) Suresh Narayanan (1), Ernest Fontes (4), Jochen Walther (5), Johannes Schaller (5), Sol M. Gruner (3,4) Jin Wang (1)
See: A.G. MacPhee et al., Science 295, 5558, 1261-1263 (2002) (and also C. F. Powell et al., J. Synchrotron Rad.7, 356-360, ).
The Advanced Photon Source is funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences. Argonne Nationasl Laboratory is a U.S. Department of Energy laboratory operated by The University of Chicago.
This work was supported by the U.S. Department of Energy under contract W-31-109-ENG-38, the Freedom CAR Program, and grants DE-FG-0297ER14805 and DE-FG-0297ER62443. CHESS is supported by the U.S. NSF and the NIH under award DMR-9713424.
Address correspondence to: