Table-top flash X-ray diagnostics of dodecane sprays
Résumé
Time resolved radiography of pure dodecane and cerium doped dodecane sprays expanding through multi-hole production diesel injectors are reported for the first time using a table top flash X-ray source. The radiograph analysis indicates that strong mixing between liquid and ambient gas occurs in the very near nozzle region. The spray is described as two different density components having different penetration velocities. The cone angle, the penetration velocities and the liquid fraction value inferred from the radiographies are in relative good agreement with the recently published results involving very close injector and injection configurations and the reference X-ray diagnostics based on synchrotron radiation. This indicates that the mean energy analysis, re-quired with the use of non monochromatic X-ray sources, appears as a reliable approach. Preliminary measure-ments of multi hole injection characteristics in a chamber inflated up to 30 bars of nitrogen are also documented. Considering the potential improvements likely to be implemented in future experiments, the table top flash X-ray radiography of diesel sprays may offer some promising alternative to the synchrotron studies.