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High-Pressure Diesel Injection Studied by Time-Resolved X-Ray Phase-Contrast Imaging
( Kamel Fezzaa ),( Wah Keat Lee ),( Seong Kyun Cheong ),( Christopher F. Powell ),( Ming Chia Lai ),( Jin Wang ) 한국액체미립화학회 2005 한국액체미립화학회 학술강연회 논문집 Vol.2005 No.-
With high-energy and high-brilliance x-ray beams available at third-generation synchrotron sources, propagation-based phase-enhanced imaging was developed as a unique metrology technique to visualize the internal structure of high-pressure fuel-injection nozzles. We have visualized the micrometer-scale machining and finishing defects inside 200-μm fuel-injection nozzles in a 3-mm-thick steel housing using phase-enhanced x-ray imaging. Because of the phase enhancement, for the first time, this new microimaging-based metrology technique has been used to directly study the highly transient pintle motion in the nozzles in situ and in real time with 10-μs temporal resolution, which is virtually impossible by any other means. The needle motion has been shown to have the most direct effect on the fuel-jet structure and spray formation immediately outside of the nozzle. In addition, a transient computational fluid dynamics simulation of in-nozzle fuel flow is in progress to correlate the fuel jets immediately outside the orifice and the in-nozzle flow.