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Urea-SCR 시스템의 유동혼합 개선을 위한 혼합기 형상에 관한 수치적 연구
이종욱(J.W. Lee),최훈기(H.K. Choi),유근종(G.J. Yoo),김원석(W.S. Kim) 한국전산유체공학회 2010 한국전산유체공학회 학술대회논문집 Vol.2010 No.5
To alleviate NOx emission, a variety of approaches has been applied. In marine diesels, the application of SCR systems has been considered an effective exhaust aftertreatment method for NOx emission control. Most current SCR systems use a various catalyst for the reaction of ammonia with NOx to form nitrogen and water. In theory, it is possible to achieve 100% NOx if the NH3-to-NOx ratio is 1:1. However, the reaction has a limited non-uniformity of the exhaust gas flow and ammonia concentration distribution. Therefore, it is necessary to investigate the optimum flow conditions. In order to achieve uniform flow at monolith front face, we are equipped with a various mixed device. In this paper, it is presented that the mixed devices play an important role improvement of flow patterns and particle distributions of NH3 by numerical simulation.
설계인자 변경에 따른 버터플라이 밸브 유동 특성에 관한 연구
이종욱(J.W. Lee),최훈기(H.K. Choi),유근종(G.J. Yoo) 한국전산유체공학회 2009 한국전산유체공학회 학술대회논문집 Vol.2009 No.11
Flow control butterfly valve(FCBV) is known to have difficulty in controlling flow rate along valve opening due to its high flow rate. In low opening condition, the butterfly valve also has some shortcomings such as noise, vibration and erosion which are mostly caused by cavitation effects. Therefore, the FCBV requires proper remedies to reduce cavitation effects and to improve .flow control performance. Numerical analysis is applied to FCBV flow to find effects of design factors such as seat diameter and valve opening rate. Cases with 3 different sizes of seat diameter and various valve opening rate are selected for the numerical analysis. From the analysis results, it is found that the FCBV with small seat diameter shows better pressure loss performance and reduced cavitation effects.
이종욱(J W Lee),임종석(C S Rim) 한국정보과학회 1991 한국정보과학회 학술발표논문집 Vol.18 No.2
본 논문에서는 3층 채널 배선(Three Layer Channel Routing)에서 via 최소화 문제(Via Minimization Problem)를 층 재배정(Layer Re-assignment)과 via shifting 방법을 이용하여 해결하는 휴리스틱 알고리즘을 제안하였다. 제안된 알고리즘은 via의 제거를 위하여 라인 세그먼트들이 배정된 층을 적당한 층으로 재배정하는 순환 프로시쥬어를 사용하며, 라인 세그먼트 상에서 via의 위치를 이동시켜, 전체 via의 수를 더욱 감소시킨다. 본 논문에서 제안한 알고리즘을 C언어로 구현, 수행시킨 결과, 기존에 제시되었던 방법에 비해 더 많은 via의 감소를 얻을 수 있었다.
설계인자 변경에 따른 버터플라이 밸브 유동 특성에 관한 연구
이종욱(J.W. Lee),최훈기(H.K. Choi),유근종(G.J. Yoo) 한국전산유체공학회 2010 한국전산유체공학회지 Vol.15 No.1
Flow control butterfly valve(FCBV) is known to have difficulty in controlling flow rate along valve opening due to its high flow rate. In low opening condition, the butterfly valve also has some shortcomings such as noise, vibration and erosion which are mostly caused by cavitation effects. Therefore, the FCBV requires proper remedies to reduce cavitation effects and to improve flow control performance. Numerical analysis is applied to FCBV flow to find effects of design factors such as seat diameter and valve opening rate. Cases with 3 different sizes of seat diameter and various valve opening rate are selected for the numerical analysis. From the analysis results, it is found that the FCBV with small seat diameter shows better pressure loss performance and reduced cavitation effects.
Urea-SCR 시스템에서 유동혼합 개선을 위한 혼합기 형상에 관한 수치적 연구
이종욱(J.W. Lee),최훈기(H.K. Choi),유근종(G.J. Yoo) 한국전산유체공학회 2010 한국전산유체공학회지 Vol.15 No.4
To alleviate NOx emission, a variety of approaches has been applied. In marine diesels, the application of SCR systems has been considered an effective exhaust aftertreatment method for NOx emission control. Most current SCR systems use a various catalyst for the reaction of ammonia with NOx to form nitrogen and water. In theory, it is possible to achieve 100% NOx if the NH₃-to-NOx ratio is 1:1. However, the reaction has a limited non-uniformity of the exhaust gas flow and ammonia concentration distribution. Therefore, it is necessary to investigate the optimum flow conditions. In order to achieve uniform flow at monolith Front face, we are equipped with a various mixed devices. In this paper, it is presented that the mixed devices play an important role improvement of flow patterns and particle distributions of NH₃ by numerical simulation.