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http://dx.doi.org/10.5762/KAIS.2016.17.6.650

Study on the Flow Characteristics of Urea-SCR Swirl Injector according to the Needle Lift Profile  

Gwak, Eun-Jo (Mechanical Engineering, Graduate School, Kongju National University)
Park, Sung-Young (Div. of Mechanical & Automotive Engineering, Kongju National University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.17, no.6, 2016 , pp. 650-655 More about this Journal
Abstract
In this study, a computational simulation of the internal flow characteristics was carried out for a Urea-SCR Injector. A single hole swirl injector with a swirl disk and slanted nozzle was used in this simulation. The maximum needle lift and opening velocity were selected as the design parameters. To analyze the unsteady internal flow characteristics of the Urea-SCR injector, the moving grid technique was applied to simulate the delicate needle movement. According to the simulation results, the injected mass flow rate from the Urea-SCR injector decreased with increasing needle opening velocity and maximum needle lift. This is because the Urea-solution tends to fill the empty space that the needle previously occupied. The swirl flow is decreased as the flow goes through the injector nozzle, because of the friction with the nozzle wall. Also, during the maximum needle lift period, the swirl coefficient and mean swirl coefficient increase with increasing needle lift. The results of this study may be used as the basic design data of related injectors.
Keywords
Computational simulation; Injector; Internal flow; Moving grid; Urea-SCR;
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1 R. Snow, G. Cavatatio, D. Dobson, C. Montreuil and R. Hammerle, "Calibration of a LNT-SCR Diesel Aftertreatment System," SAE 2007-01-124, 2007. DOI: http://dx.doi.org/10.4271/2007-01-1244
2 Y. Ham and Y. Park, "Development of Map based Open Loop Control Algorithm for Urea-SCR System," Transaction of KSAE, Vol.19, No.2, pp.95-105, 2011.
3 S. J. Jeong, W. S. Kim, J. K. Park, H. K. Lee and S. D. Oh, "The Development and Implementation of Model-based Control Algorithm of Urea-SCR Dosing System for Improving De-NOx Performance and Reducing NH3-slip," Transaction of KSAE, Vol.20, No.1, pp.50-56, 2012. DOI: http://dx.doi.org/10.7467/ksae.2012.20.1.095
4 M. Colombo, I. Nova, E. Tronconi, V. Schmeisser, B. Banbl-Konrad and L. Zimmermann, "NO/NO2/N2O-NH3 SCR Reactions over a Commercial Fe-Zeolite Catalyst for Diesel Exhaust Aftertreatment : Intrinsic Kinetics and Monolith Converter Modelling," Applied Catalysis b: Environmental, pp.106-118, 2012. DOI: http://dx.doi.org/10.1016/j.apcatb.2011.09.023   DOI
5 M. Koebel, M. Elesner and M. Kleemann, "Urea-SCR: A Promising Technique to Reduce NOx Emissions from Automotive Diesel Engines," Applied Catalysis, pp.335-345, 2000. DOI: http://dx.doi.org/10.1016/s0920-5861(00)00299-6   DOI
6 J. Oh, W. Cha, K. Kim, J. Lee and K. Lee, "A Study on the Characteristics and Droplet Uniformity of Spray Injection to Exhaust Gas Flow from Urea Solution Injector," Transaction of KSAE, Vol.19, No.3, pp.83-89, 2011.
7 J. W. Seo, K. I. Lee, J. T. Oh, Y. H. Choi and J. H. Lee, J. I. Park, "The Study on the Effects of Mixer Configurations on Fluid Mixing Characteristics in SCR System," Transaction of KSAE, Vol.16, No.6, pp.192-199, 2008.
8 S. I. Lee, S. Y. Park, "Numerical analysis of internal flow characteristics of urea injectors for SCR dosing system", Fuel, Vol.129, pp.54-56, 2014. DOI: http://dx.doi.org/10.1016/j.fuel.2014.03.031   DOI
9 CD-Adapco, "SATR-CCM+ ver. 8.06 User Guide", 2013.