KEYWORDS
TOPICS
ABSTRACT
In the present study, a flow rig with optical access intended for spray investigations in exhaust system-relevant conditions was analysed in terms of flow and temperature in the spray area using numerical simulations. The operation of the rig was examined for a wide range of exhaust mass flow rates, temperatures and various forms of UWS (urea-water solution) spray plumes. The locations of the injector and thermocouple were verified. Both conventional and flash-boiling injections were considered to assess the effect of the interaction of sprays with a gas flow. The results showed a highly uniform flow in the visualisation area, with only minor fluctuations near the walls. A similar observation was carried out for the temperature distribution. It was found that the extreme operating conditions caused substantial deformations of the spray plumes. However, the selected injector location allowed us to properly observe the spray formation regardless of the flow conditions. The study showed that the examined test rig enabled reliable spray investigations for a wide range of operating points.
FUNDING
The project leading to this application has received funding from the National Centre for Research and Development (NCBiR), grant no. MAZOWSZE/0101/19-00, programme Ścieżka dla Mazowsza, project budget: 9 880 490.25 PLN. Numerical simulations were performed using AVL FIRE™ software under AVL University Partnership Program.
 
REFERENCES (20)
1.
ADITYA WARDANA, M.K., HYUN, J., LIM, O. A study of urea injection timing to predict the NOx conversion in SCR systems. Energy Procedia. 2019, 158, 1942-1948. https://doi.org/10.1016/j.egyp....
 
2.
BORUC, Ł., ROGOZ, R., BACHANEK, J. et al. An experimental facility for rapid testing of SCR systems. SAE Technical Paper 2020-01-2192. 2020, https://doi.org/10.4271/2020-0....
 
3.
BOULET, P., TISSOT, J., TRINQUET, F. et al. Enhancement of heat exchanges on a condenser using an air flow containing water droplets. Applied Thermal Engineering. 2013, 50(1), 1164-1173. https://doi.org/10.1016/j.appl....
 
4.
BRIZI, G., POSTRIOTI, L., VAN VUUREN, N. Experimental analysis of SCR spray evolution and sizing in high-temperature and flash boiling conditions. SAE International Journal of Fuels and Lubricants. 2019, 12(2), 4-12. https://doi.org/10.4271/04-12-....
 
5.
KAPUSTA, Ł.J., ROGOZ, R., BACHANEK, J. Experimental and numerical study to evaluate the effect of flash boiling on urea-water solution sprays and selective catalytic reduction system performance. Atomisation and Sprays. 2021, 31(5), 89-117. https://doi.org/10.1615/Atomiz....
 
6.
KAPUSTA, Ł.J., SUTKOWSKI, M., ROGÓŻ, R. et al. Characteristics of water and urea–water solution sprays. Catalysts. 2019, 9(9), https://doi.org/10.3390/catal9....
 
7.
LIAO, Y., DIMOPOULOS EGGENSCHWILER, P., SPITERI, A. et al. Fluid dynamic comparison of AdBlue injectors for SCR applications. SAE International Journal of Engines. 2015, 8(5), 2303-2311. https://doi.org/10.4271/2015-2....
 
8.
LIEBER, C., KOCH, R., BAUER, H.-J. Microscopic imaging spray diagnostics under high temperature conditions: application to urea–water sprays. Applied Sciences. 2019, 9(20). https://doi.org/10.3390/app920....
 
9.
LIEBER, C., KOCH, R., BAUER, H.-J. Spray evaporation of urea–water solution: Experiments and modelling. Experimental Thermal and Fluid Science. 2020, 116, 110108. https://doi.org/10.1016/j.expt....
 
10.
NISHAD, K., RIES, F., JANICKA, J. et al. Analysis of spray dynamics of urea–water-solution jets in a SCR-DeNOx system: an LES based study. International Journal of Heat and Fluid Flow. 2018, 70, 247-258. https://doi.org/10.1016/j.ijhe....
 
11.
NOCIVELLI, L., MONTENEGRO, G., DIMOPOULOS EGGENSCHWILER, P. Low pressure-driven injection characterization for SCR applications. SAE Technical Paper 2019-01-0994. 2019. https://doi.org/10.4271/2019-0....
 
12.
PAYRI, R., BRACHO, G., GIMENO, J. et al. Spray characterization of the urea-water solution (UWS) injected in a hot air stream analogous to SCR system operating conditions. SAE Technical Paper 2019-01-0738. 2019. https://doi.org/10.4271/2019-0....
 
13.
PAYRI, R., BRACHO, G., GIMENO, J. et al. Investigation of the urea-water solution atomisation process in engine exhaust-like conditions. Experimental Thermal and Fluid Science. 2019, 108, 75-84. https://doi.org/10.1016/j.expt....
 
14.
PAYRI, R., BRACHO, G., MARTÍ-ALDARAVÍ, P. et al. Computational study of urea–water solution sprays for the analysis of the injection process in SCR-like conditions. Industrial & Engineering Chemistry Research. 2020, 59(41), 18659-18673. https://doi.org/10.1021/acs.ie....
 
15.
POSTRIOTI, L., BRIZI, G., FINORI, G.M. Experimental analysis of water pressure and temperature influence on atomization and evolution of a port water injection spray. Applied Sciences. 2021, 11(13), 5980. https://doi.org/10.3390/app111....
 
16.
SCHMIDT, A., VAN DER KLEY, S., WAGNER, S. Optically accessible generic exhaust gas test bench for the investigation of fundamental SCR-relevant processes. Applied Optics. 2020, 59(23), 6953-6958. https://doi.org/10.1364/AO.397....
 
17.
SPITERI, A., DIMOPOULOS EGGENSCHWILER, P. Experimental fluid dynamic investigation of urea–water sprays for diesel selective catalytic reduction–DeNOx applications. Industrial & Engineering Chemistry Research. 2014, 53(8), 3047-3055. https://doi.org/10.1021/ie4040....
 
18.
SPITERI, A., DIMOPOULOS EGGENSCHWILER, P., LIAO, Y. et al. Comparative analysis on the performance of pressure and air-assisted urea injection for selective catalytic reduction of NOx. Fuel. 2015, 161, 269-277. https://doi.org/10.1016/j.fuel....
 
19.
VARNA, A., BOULOUCHOS, K., SPITERI, A. et al. Numerical Modelling and Experimental Characterization of a Pressure-Assisted Multi-Stream Injector for SCR exhaust gas after-treatment. SAE Technical Paper 2014-01-2822. 2014. https://doi.org/10.4271/2014-0....
 
20.
VARNA, A., SPITERI, A.C., WRIGHT, Y.M. et al. Experimental and numerical assessment of impingement and mixing of urea – water sprays for nitric oxide reduction in diesel exhaust. Applied Energy. 2015, 157, 824-837. https://doi.org/10.1016/j.apen....
 
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