Journal of ILASS-Korea (한국분무공학회지)

Institute for Liquid Atomization and Spray Systems-Korea (한국분무공학회)
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Analytical Study on Unsteady Flow Characteristics of Urea-SCR Single Hole Injector depend on Nozzle Shape Change

Urea-SCR 단홀 Injector 노즐형상 변화에 따른 비정상유동특성의 해석적 연구

  • 황준환 (국립공주대학교 일반대학원 기계공학과) ;
  • 박성영 (국립공주대학교 공과대학 기계자동차공학부)
  • Received : 2019.03.13
  • Accepted : 2019.05.02
  • Published : 2019.09.30
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Abstract

In this paper, a study of Urea-SCR System for Dosing Injector for responding to enhanced environmental regulations has been conducted. There is a limit to the experimental approach due to the structural characteristics of the injector. In order to overcome this problem, The analysis was performed assuming unsteady turbulent flow through computational fluid analysis and the internal flow characteristics of the injector were analyzed. By changing the nozzle shape of the injector, the performance factors of the swirl injector by shape were selected and compared. The design parameters were modified by changing the diameter of the nozzle at a constant ratio compared to the base model. Swirl coefficient, outlet mass flow, and sac volume were selected as performance parameters of the injector. The Conv. model to which the taper was applied showed the dominance in mass flow rate, discharge coefficient and swirl because of the smooth fluid flow by shape. Swirl coefficient, outlet mass flow, and sac volume were selected as performance parameters of the injector. As a result of the comparison coefficient derivation with those performance parameters for comparing the performance of the model-specific injector, the Conv-140 model with the nozzle diameter expanded by 140% showed the best value of the comparison coefficient.

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References

  1. J. Girard, R. Snow, G. Cavataio, and Christine Lambert, "The influence of ammonia to NOx ratio on SCR performance", SAE Technical Paper 2007-01-1581, 2007.
  2. S. J. Jeong, W. S. Kim, J. K. Park, H. K. Lee and S. D. Oh, "The Development and Implementation of Modelbased Control Algorithm of Urea-SCR Dosing System for Improving De-NOx Performance and Reducing NH3-slip", Transaction of KSAE, Vol. 20, No. 1, 2012, pp. 50-56.
  3. E. J. Gwak, S. Y. Park, "Study on the Flow Characteristics of Urea-SCR Swirl Injector according to the Leedle Lift Profile", Journal of the Korea Academia-Industrial cooperation Society, Vol. 17, No. 6, 2016, pp. 650-655. https://doi.org/10.5762/KAIS.2016.17.6.650
  4. Y. Ham and Y. Park, "Development of Map based Open Loop Control Algorithm for Urea-SCR System", Transaction of KSAE, Vol. 19, No. 2, 2011, pp. 95-105.
  5. J. W. Han, H. Gong, I. G. Hwang, C. Lee and S. Park, "Experimental Investigation on DeNOx Performance according to the Urea-SCR System Control at Various Operating Conditions for Diesel Engines", Transaction of KSAE, Vol. 18, No. 6, 2010, pp. 76-83.
  6. S. W. Lee and S. Y. Park, "An Experimental Study on Spray Characteristics of Multi-Hole GDI Injector" Journal of ILASS-Korea, Vol. 16, No. 4, 2011, pp. 201-209. https://doi.org/10.15435/JILASSKR.2011.16.4.201
  7. D. J. Kim, J. H. Im, P. G. Han and Y. B. Yoon, "The Effects of Operating Conditions and Injector Geometry on the Spray Characteristics of Swirl Injectors" Journal of ILASS-Korea, Vol. 9, No. 1, 2004, pp. 21-29.
  8. Siemens, "Star-CCM+ ver. 13.04 User Guide", 2018.