An ultra-fast X-ray radiography technique has been developed to study the structure of diesel sprays. Radiography provides quantitative time-resolved measurements of the fuel distribution from near the spray orifice to the dispersed far-field spray. It offers several advantages over traditional spray diagnostics, since it provides quantitative data and is not limited to dilute regions of the spray. X-ray radiography does have significant limitations, however; the acquired data are ensemble averaged and pathlength integrated. The results which can be obtained from X-ray radiography are demonstrated using a short-duration (400 μs) low-pressure (250 bar) diesel injection into a gas at atmospheric pressure and room temperature from a Bosch light-duty diesel injector. Other possible uses of X-ray diagnostics and future directions in radiography research are also discussed.
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