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Vane-type Static Mixer에 의한 디젤차량 배기관 내의 혼합 유동 특성에 관한 연구
강경남(Kyoungnam Kang),정민승(Min Seung Jung),김종민(Chongmin Kim),이지근(Jeekeun Lee),김만영(Man Young Kim) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
In this work, the mixing and flow characteristics of a vane-type static mixer were carried out numerically for the reduction of NOx in the SCR-system of the diesel engines. The mixer was located in the 57 times pipe diameter away from the inlet. The analysis were performed by changing such various parameters as vane shape, angles, blockage ratio and location of the vane. The flow structure through the mixer was characterized by uniformity index and pressure drop. The results show that uniformity index and pressure coefficient are substantially influenced by the vane shape, angle, blockage ratio and position of the vane of the mixer.
베인 타입 스태틱 믹서의 기하학적 변수에 따른 디젤 배기관 내 유동특성에 관한 연구
강경남(Kyoungnam Kang),이지근(Jeekeun Lee),김만영(Man Young Kim) 대한기계학회 2012 大韓機械學會論文集B Vol.36 No.4
디젤엔진 SCR 시스템 내에서 NOx를 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. 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 NOx 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.
Vane-type Static Mixer 최적설계를 위한 기하학적 변수에 따른 혼합유동특성에 관한 수치적 연구
강경남(Kyoungnam Kang),김만영(Manyoung Kim),이지근(Jeekeun Lee) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
In this work, the mixing flow characteristic of a vane-type static mixer were carried out numerically to reduce the NOx in the SCR-system of the diesel engines. The mixer was located in the 10 times pipe diameter away from the inlet. The analysis were performed by changing angles, blockage ratio and location of the vane. The flow structure through the mixer was characterized by uniformity index, swirl number and pressure drop. The results show that uniformity index, pressure drop and swirl number are influenced by the angle, blockage ratio and position of the vane of the mixer. In particular, swirl number was increased near the pipe wall or by increasing angle or by expending scale of the vane.
냉각수 순환 가열 방식의 가열원 형상에 따른 우레아 해동 및 열전달 특성에 관한 수치적 연구
이승엽(Seung Yeop Lee),강경남(Kyoungnam Kang),김만영(Man Young Kim),이천환(Chun Hwan Lee) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Urea-SCR system, which converts nitrogen oxides to nitrogen and water in the presence of a reducing agent, usually AdBlue urea solution, is known as a powerful NOx reduction system for mobile as well as stationary applications. In this work, numerical study of three-dimensional unsteady heating problems were analyzed to understand the melting and heat transfer characteristics such as liquid volume fraction, temperature profiles and generated natural convection behavior in urea solution by using the commercial software Fluent 6.3. After validating by comparing numerical and experimental data with pure gallium melting phenomena, numerical experiment for urea melting is conducted with three different coolant heating models. Finally, it can be found that the CH2 model, in which more coolant is concentrated on the lower part of the Urea tank, has relatively better melting capability than others.