Journal
APPLIED SCIENCES-BASEL
Volume 9, Issue 20, Pages -Publisher
MDPI
DOI: 10.3390/app9204403
Keywords
shadowgraphy; droplet sizing; particle tracking velocimetry; turbulent dispersion; astigmatism; evaporation; selective catalytic reduction
Categories
Funding
- MTU Friedrichshafen
Ask authors/readers for more resources
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 4 mum and droplet velocities up to 250 ms-1. In addition, the operating conditions of the gaseous flow of up to 873 K and 0.6 MPa 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 atomiser. It is demonstrated that the velocity of the gas can be approximated by the velocity of the smallest detectable droplets with sufficient accuracy. Furthermore, the statistical analysis of velocity fluctuations provides data for predicting the turbulent dispersion of the droplets.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available