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Microscopic Imaging Spray Diagnostics under High Temperature Conditions: Application to Urea–Water Sprays

Lieber, Christian; Koch, Rainer; Bauer, Hans-Jörg

Abstract (englisch):
The quantitative investigation of droplet laden turbulent flows at high temperature conditions is of great importance for numerous applications. In this study, an experiment was set up for investigation of evaporating urea-water sprays, which are relevant for the effective reduction of nitrogen oxide emissions of diesel engines using Selective Catalytic Reduction. A shadowgraphy setup is pushed to its limits in order to detect droplet diameters as small as 4µm and droplet velocities up to 250m/s. In addition, the operating conditions of the gaseous flow of up to 873K and 0.6MPa are an additional challenge. Due to the high temperature environment, image quality is prone to be compromised by schlieren effects and astigmatism phenomena. A water-cooled window and an astigmatism correction device are installed in order to correct these problems. The results to be presented include characteristics of the turbulent gas flow as well as detailed spray characteristics at different positions downstream of the atomizer. It is demonstrated that the velocity of the gas can be approximated by the velocity of the smallest detectable droplets with sufficient accuracy. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000099474
Veröffentlicht am 31.10.2019
Originalveröffentlichung
DOI: 10.3390/app9204403
Scopus
Zitationen: 6
Web of Science
Zitationen: 7
Dimensions
Zitationen: 6
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Thermische Strömungsmaschinen (ITS)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2019
Sprache Englisch
Identifikator ISSN: 2076-3417
KITopen-ID: 1000099474
Erschienen in Applied Sciences
Verlag MDPI
Band 9
Heft 20
Seiten 4403
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Gefördert vom Ministerium für Wissenschaft, Forschung und Kunst Baden-Württemberg (MWK) im Rahmen des Open-Access-Förderprogramms "BW BigDIWA"
Vorab online veröffentlicht am 17.10.2019
Schlagwörter Shadowgraphy, Droplet Sizing, Particle Tracking Velocimetry, Turbulent Dispersion, Astigmatism, Evaporation, Selective Catalytic Reduction
Nachgewiesen in Web of Science
Dimensions
Scopus
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