Messtechnische Erfassung des Strahlaufbruchs von Dieselsprays im Düsennahbereich
Gröger K, Durst A, Dinkelacker F, Wensing M (2018)
Publication Language: German
Publication Type: Conference contribution, Conference Contribution
Publication year: 2018
Event location: Bad Neuenahr
Abstract
In modern and future Diesel engines, mixture formation is a crucial requirement to optimize the combustion and reduce both, CO2 as well as pollutants. Modern injection systems of diesel engines are high-tech products, which have been developed very far yet. Though, a big potential for increasing efficiency and reducing emissions is left over here. Indeed the effects occurring in the spray holes, which nowadays measure 100 μm and below, are barely understood yet. The same is true for the chemical and physical processes in the primary atomization region in the direct vicinity of the nozzle where the optical density is very high, impeding optical measurements in this area. Hence, the evolution of injectors is based on lengthy and costly empirical work. This project will research the potential of the most current measurement techniques to investigate the near nozzle region, especially the primary breakup and atomization. Namely, these are optical techniques, integral spray momentum measurements as well as methods using synchrotron x-rays.
These techniques can also be structured according to the measurement task: primary spray structures, spray velocity distributions and spray mass distributions as well as spray momentum.
To depict primary spray structures, good progress has been achieved using a novel light sheet fluorescence microscopic (LSFM) imaging technique in the visible range of the electromagnetic spectrum. Very detailed and sharp pictures were taken and a very good correlation with x-ray phase contrast imaging (PCI) was achieved. Moreover, with the optical connectivity method, a new level of image quality and resolution was reached yielding in very comparable results as well.
For measuring the nozzle-near mass distribution, with x-ray absorption spectroscopy quantitative results were achieved. This measurements correlate with the spray structure of LSFM and OCM measurements very well too.
Concerning the velocity distribution, with x-ray phase contrast velocimetry (PCV) as well as structural image velocimetry (SIV) very good and high resoluted results were obtained. These results correlate within each other as well as with the also used laser-2-focus measurements very well.
Spray momentum was calculated from the x-ray data and measured on a spray momentum test bench. The results were proven to match well.
Moreover, the suitability for the measurement techniques for a GDI as well as a Diesel injector is proven.
Authors with CRIS profile
Alexander Neubauer
Professur für Fluidsystemtechnik
Michael Wensing
Professur für Fluidsystemtechnik
Involved external institutions
Germany (DE)How to cite
APA:
Gröger, K., Durst, A., Dinkelacker, F., & Wensing, M. (2018). Messtechnische Erfassung des Strahlaufbruchs von Dieselsprays im Düsennahbereich. In Tagungsband FVV-Frühjahrstagung 2018. Bad Neuenahr.
MLA:
Gröger, Karsten, et al. "Messtechnische Erfassung des Strahlaufbruchs von Dieselsprays im Düsennahbereich." Tagungsband FVV-Frühjahrstagung 2018, Bad Neuenahr 2018.
BibTeX: Download