Vortrag (20 Min., 5 Min. Diskussion, 5 Min. Raumwechsel)
One of the great challenges for high precision engineering, particularly within modern vehicle fuel systems, is direct observation of real systems in operation. The nature of such systems operating at extremely high pressure and temperature, very high time precision and repetition rates and constructed as often of hardened steel, is such that direct observation of production systems behaviour is very challenging. As such, data is generated to inform engineering research and development either from idealised models, indirect measurements of secondary parameters and from observation of simplified and less challenging systems i.e. optical imaging of glass systems operated at ambient pressure and temperature.
Advances in hard x-ray imaging at the European Synchrotron Radiation Facility are allowing the combination of high spatial resolution 3D inspection to be used in conjunction with high temporal resolution radiographic imaging, to drastically improve the data available from direct observation of real production systems and hence inform modelling. From the structure of fluid channels to the subsequent spray structure generated, to the direct observation of operation of complex moving part of engine systems, high flux hard x-ray imaging is allowing measurements previously not possible for such challenging systems.
In this study we demonstrate 1 micron resolved tomography of fuel injector sprayhole deposits, to allow accurate model generation of the impact of deposition on fuel spray structure, and conduct megahertz resolved imaging of fuel sprays for direct observation of the spray structure in situ. Additionally, we will show the use of 200kHz imaging at 2 microns spatial resolution through 5mm of hardened steel, to allow direct observation of production systems in real world operation. Though challenging, such experiments are now possible and can be quantified for data generation to inform real world engineering research and development.