Abstract
In recent years, X-ray radiography has been used to probe the internal structure of dense sprays with microsecond time resolution and a spatial resolution of 15 µm even in high-pressure environments. Recently, the 7BM beamline at the Advanced Photon Source (APS) has been commissioned to focus on the needs of X-ray spray radiography measurements. The spatial resolution and X-ray intensity at this beamline represent a significant improvement over previous time-resolved X-ray radiography measurements at the APS.
Highlights
Spray systems have important applications in internal combustion engines, rocket combustors, paint application and other industries
Optical techniques are commonly used to study the spray structure and droplet sizing. For dilute sprays these optical techniques can be applied effectively. For dense sprays, such as those seen in fuel sprays for diesel engines, the strong scattering of light by the spray droplets makes the use of optical techniques problematic (Sick & Stojkovic, 2001)
To demonstrate the performance of the beamline, time-resolved radiography has been performed on diesel sprays
Summary
Spray systems have important applications in internal combustion engines, rocket combustors, paint application and other industries. Optical techniques are commonly used to study the spray structure and droplet sizing. For dilute sprays these optical techniques can be applied effectively. For dense sprays, such as those seen in fuel sprays for diesel engines, the strong scattering of light by the spray droplets makes the use of optical techniques problematic (Sick & Stojkovic, 2001). An alternative to optical techniques is X-ray radiography and imaging of spray systems. A significant limitation to previous X-ray radiography measurements of fluid dynamics has been access to an X-ray source of sufficient intensity to produce time-resolved measurements of spray structure. The beamline used in previous experiments uses a crystal monochromator with a relatively narrow energy bandwidth This narrow bandwidth limits the flux available for the current radiography measurements. This paper will discuss the properties and potential of this beamline in detail
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