Spray Diagnostics at the Advanced Photon Source 7-BM Beamline

In recent years, x-ray radiography has been used to probe the internal structure of dense sprays. Quantitative measurements of spray mass distribution have been obtained on microsecond time scales and with spatial resolution of 15 μm even in high-pressure environments. These data have been difficult or impossible to obtain with conventional optical diagnostics. A limitation to these measurements is the need to perform them at a synchrotron light source. While several synchrotrons are available throughout the world, the experimental time at these facilities is competitively awarded and is often limited. Moreover, synchrotron beamlines are often not well instrumented to study sprays. This has limited the scope of previous spray radiography measurements. Recently, commissioning has begun of a new experimental station at the Advanced Photon Source largely dedicated to x-ray spray measurements. This facility provides significantly enhanced access to the x-ray beam in an environment tailored to spray measurements. The spatial resolution and x-ray intensity at this beamline also represent a significant improvement over previous x-ray radiography measurements at the APS. The capabilities of the beamline will be outlined in detail. Sample data from a diesel spray from a 110 μm single-hole nozzle will be used to demonstrate the capabilities of the new beamline for performing spray measurements. The prospects for additional measurements of sprays and spray systems will also be discussed. * Corresponding Author: [email protected]