| Title |
Numerical Investigation on Wall Flow Control for Preventing Contaminants Deposition inside a Duct |
| Authors |
이방욱(Banguk Lee) ; 이지근(Jeekeun Lee) |
| DOI |
http://dx.doi.org/10.6110/KJACR.2013.25.5.261 |
| Keywords |
배기관 ; 믹서-하우징 조합체 ; 벽면유동 ; 유동제어 ; 우레아염 퇴적 Exhaust pipe ; Mixer-housing assembly ; Wall flow ; Flow control ; Urea-salt deposition |
| Abstract |
Technologies for preventing contaminants deposition are a key issue in a modern duct system. When particulate matters deposit inside the exhaust pipes, which are widely used in the Urea-SCR system to reduce NOx emission from heavy duty diesel engines, many problems arise associated with increased flow resistance and corrosion. Therefore, the development of the urea deposition avoidance technologies is being treated as an important issue of the Urea-SCR system. An analytical study was carried out to investigate the effects of the wall flow around the mixer with the variation of the mixer housing surrounding and supporting the mixer, which is designed to increase the wall flow and then to reduce droplet deposition. The housing angles and the position of the mixer were changed：angles of 0°, 1°, 2°, and 3°, and mixer positions of 0 L, 0.5 L, and 1 L. The axial velocity distributions, maximum velocity, the half-width, and momentum distribution of the wall flow were investigated to examine the effect of the mixer-housing assembly geometry. |