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      • [가솔린엔진] 배기규제대응을 위한 이중벽 배기관 기본 설계 연구

        심창열(C.Y. Shim),원종필(J.P. Won),이규현(K.H. Lee) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-

        In this study, the double walled exhaust tube system was investigated as an effective countermeasure to reduce pollutant exhaust gas emission. especially to reduce pollutant exhaust gas emission at cold start and idling stage, in which the catalyst is not reached to light-off temperature. In this study, it has shown that the double walled exhaust pipe construction can shorten the time to reach to light off temperature of the catalyst in cool start state and reduce the emission of hydro-carbon(HC) significantly due to thermal insulation effect. In the study, 3 dimensional thermal fluid analysis in double walled exhaust system has been done through computational fluid dynamics method. The analytical results were compared with experimentals obtained from specially fabricated bench tester and it had shown excellent conformity in both results. From the present study results basic major data to construct and design the optimum double walled exhaust tube system were achieved.

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