Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
권호 표지
DOI QR코드

DOI QR Code

Numerical Study of the Flow Characteristics in a Diesel Exhaust System with a Vane-Type Static Mixer

베인 타입 스태틱 믹서의 기하학적 변수에 따른 디젤 배기관 내 유동특성에 관한 연구

  • Kang, Kyoung-Nam (Dept. of Aerospace Engineering, Chonbuk Nat'l Univ.) ;
  • Lee, Jee-Keun (School of Mechanical System Engineering, Chonbuk Nat'l Univ.) ;
  • Kim, Man-Young (Dept. of Aerospace Engineering, Chonbuk Nat'l Univ.)
  • 강경남 (전북대학교 항공우주공학과) ;
  • 이지근 (전북대학교 기계시스템공학부) ;
  • 김만영 (전북대학교 항공우주공학과)
  • Received : 2011.08.02
  • Accepted : 2012.01.17
  • Published : 2012.04.01
Download PDF
⟨ Previous Next ⟩

Abstract

In this research, a numerical study was carried out on the mixing and flow characteristics of a vane-type static mixer for the reduction of $NO_x$ in the SCR systems from the diesel exhaust environments. The mixer was located at a distance of 57 times the pipe diameter away from the inlet. The analyses were performed by changing various parameters such as vane angles, blockage ratio, and location of the vane. Flow characteristics through the mixer were characterized by the uniformity index, swirl number, and pressure drop. The results show that uniformity index, pressure coefficient and swirl number are substantially influenced by the vane angle, blockage ratio and position of the vane of the mixer. In particular, the swirl number was increased when the vane was located near the pipe wall, or the vane angle was increased or scale was extended.

디젤엔진 SCR 시스템 내에서 $NO_x$를 저감을 위한 베인 타입 스태틱 믹서의 혼합유동특성을 수치적으로 연구하였다. 믹서는 원형관의 입구로부터 유동방향으로 직경의 57배 떨어진 구간에 설치하였다. 베인이 유동 축과 이루는 각과 베인의 크기 그리고 위치의 변화에 따른 유동 및 혼합특성을 고찰하였다. 원형관내에서 믹서를 통과하는 유동의 특성은 UI, 선회비, 그리고 압력계수와 같은 특성화된 성능지수로 나타내었다. 해석결과 성능지수들은 베인 각과 차단비, 베인 위치와 같은 기하학적 변수에 영향을 받음을 확인하였다. 특히, 베인 각, 베인 크기가 커지거나 원형관내의 벽면에 가까이 설치될수록 선회비는 증가하는 것을 확인하였다.

Keywords

References

  1. Kim, J. H., Kim, M. Y. and Kim, H. G., 2010, "NO2-Assisted Soot Regeneration Behavior in a Diesel Particulate Filter with Heavy-Duty Diesel Exhaust Gases," Numerical Heat Transfer, Part A, Vol.58, No.9, pp.725-739. https://doi.org/10.1080/10407782.2010.523293
  2. Yun, B. K., Kim, C., Kim, M. Y., Cho, G. B., Kim, H. S. and Jeong, Y. I., 2010, "Numerical Modeling of Vanadia-based Commercial Urea-SCR plus DOC Systems for Heavy-duty Diesel Exhaust Aftertreatment Systems," Trans. of the KSAE, Vol.18, No.2, pp.24-30.
  3. Johnson, T. V., 2007, "Diesel Emission Control in Review," SAE 2007-01-0233.
  4. Heering, H. P., Onder, C. H., Elsener, M. and Schaer, C. M., 2003, "Control of a Urea SCR Catalytic Converter System for a Mobile Heavy duty Diesel Engine," SAE 2003-01-0776.
  5. Jeong, S. J., Lee, C. H., Kim, W. S. and Lee, C. H., 2007, "The Effect of Ammonia and Flow Distribution on DeNOx Performance of Urea-SCR Catalyst in a Heavy Duty Diesel Engine," Trans. of the KSAE, Vol.7, No.1, pp.229-235.
  6. Zhang, X. and Romzek, M., 2006, "3D Numerical Study of Mixing Characteristics of NH3 in Front of SCR," SAE 2006-01-3444.
  7. Lang, E., Drtina, P., Strieiff, F. and Fleischli, M., 1995, "Numerical Simulation of the Fluid Flow and the Mixing Process in an Static Mixer," International Journal of Heat and Mass Transfer, Vol.38, No.12, pp.2239-2250. https://doi.org/10.1016/0017-9310(94)00351-U
  8. Regner, M., Ostergren, K. and Tragardh, C., 2001, "Effect of Geometry and Flow Rate on Secondary Flow and the Mixing Process in Static Mixer-A Numerical Study," Chemical Engineering Science, Vol.61, No.18, pp.6133-6141. https://doi.org/10.1016/j.ces.2006.05.044
  9. Oesterle, J. J., Calvo, S., Damson, B., Feyl, G., Neumann, F. and Rudelt, J., 2008, "Urea Systems in Focus-New Challenges and Solutions in the Development of Car and Commercial Vehicle Exhaust Systems," SAE 2008-01-1186.
  10. Oesterle, J. J., Calvo, S., Damson, B., Feyl, G., Neumann, F. and Rudelt, J., 2008, "SCR Technology with Focus to Stringent Emissions Legislation," SAE 2008-01-2640.
  11. Zheng, G., Palmer, G., Salanta, G. and Kotrba, A., 2009, "Mixer Development for Urea SCR Applications," SAE 2009-01-2879.
  12. Chandratilleke, G. R., Yu, A. B., Stewart, B. L. and Bridgwater, J., 2009, "Effect of Blade Rake Angle and Gap on Particle Mixing in a Cylinderical Mixer," Powder Technology, Vol.193, No.3, pp.303-311. https://doi.org/10.1016/j.powtec.2009.03.007
  13. Fluent, 2009, Release 12.0, User's Guide.
  14. Kim, C., Park, N. S. and Kim, M. Y., 2009, "Numerical Investigation of the Flow and Mixing Characteristics with the Static Mixer in a Catalytic Combustor for the MCFC Power Plant System," Trans. of the KSME(B), Vol.33, No.3, pp.149-155. https://doi.org/10.3795/KSME-B.2009.33.3.149
  15. Hong, D., Kim, C., Kim, M. Y., Lee, S. M., and Ahn, K. Y., 2007, "A Numerical Study on the Flow Characteristics in the Mixing Region of the Catalytic Combustor," Journal of Mechanical Science and Technology, Vol. 21, No.11, pp.1791-1798. https://doi.org/10.1007/BF03177434

Cited by

  1. Numerical Investigation of the Spray Behavior and Flow Characteristics of Urea-Water Solution Injected into Diesel Exhaust Pipe vol.38, pp.1, 2014, https://doi.org/10.3795/KSME-B.2014.38.1.041