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Journal Article

Time-resolved X-ray Tomography of Gasoline Direct Injection Sprays

2015-09-01
2015-01-1873
Traditional Fourier back-projection methods are not well-suited for this experiment, so a model-based iterative reconstruction algorithm has been employed in this particular application. Three gasoline direct injection sprays with various 6-hole patterns were studied at injection pressures of 100 to 175 bar and atmospheric back pressure, at selected axial positions several mm downstream of the nozzle.
Journal Article

Evaluation of Shot-to-Shot In-Nozzle Flow Variations in a Heavy-Duty Diesel Injector Using Real Nozzle Geometry

2018-04-03
2018-01-0303
Cyclic variability in internal combustion engines (ICEs) arises from multiple concurrent sources, many of which remain to be fully understood and controlled. This variability can, in turn, affect the behavior of the engine resulting in undesirable deviations from the expected operating conditions and performance. Shot-to-shot variation during the fuel injection process is strongly suspected of being a source of cyclic variability. This study focuses on the shot-to-shot variability of injector needle motion and its influence on the internal nozzle flow behavior using diesel fuel. High-speed x-ray imaging techniques have been used to extract high-resolution injector geometry images of the sac, orifices, and needle tip that allowed the true dynamics of the needle motion to emerge. These measurements showed high repeatability in the needle lift profile across multiple injection events, while the needle radial displacement was characterized by a much higher degree of randomness.
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