한국자동차공학회논문집 (Transactions of the Korean Society of Automotive Engineers)

  • 제18권5호
  • /
  • Pages.31-36
  • /
  • 2010
  • /
  • 1225-6382(pISSN)
  • /
  • 2234-0149(eISSN)
한국자동차공학회 (The Korean Society of Automotive Engineers)
권호 표지

2차 공기 분사 위치에 따른 촉매 내 공급 공기 분포에 대한 전산 유동해석

CFD Analysis on the Fresh Air Distribution in the Catalytic Converter Varying Secondary Air Injector Position

  • 윤정의 (강원대학교 삼척캠퍼스 메카트로닉스공학부)
  • Yun, Jeong-Eui (Division of Mechatronics, Kangwon National University - Samcheok Campus)
  • 투고 : 2009.09.18
  • 심사 : 2010.02.22
  • 발행 : 2010.09.01
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초록

SAI(Secondary Air Injection) system has been studied widely as one of the promising countermeasure for reducing HC emission at cold start. In this paper, in order to find out the optimal position of SAI, computational thermal fluid analysis on exhaust system adapted SAI system is performed using commercial 3-D CFD code, CFX. The present results showed that SAI position strongly affected the uniformity of air distribution in front of catalyst. And also through the decision process of optimal position of SAI, new index, uniformity of air distribution($U_{\phi}$) is proposed to define it quantitively. Because $U_{\phi}$ is very simple equation and similar with flow uniformity, it is very easy to figure out the physical meaning and to apply it to practices. Finally, we applied the index $U_{\phi}$ to the decision process of the optimal position of SAI, so that we could get the clear comparison results.

키워드

참고문헌

  1. D. C. Hong, H.-C Kwak, C.-L. Myung and S. Park, "THC Oxidation Rate in Exhaust Manifold with Synchronized Secondary Air Injection using High Speed THC Analyzer," Fall Conference Proceedings, KSAE, KSAE04- F0008, 2004.
  2. S. Lee, Y. Young Ham and K. M. Chun, "Experimental Study of the Effect of Secondary Air Injection on the Cold Start Total Hydrocarbon Emissions in a Spark Ignition Engine," Transactions of KSAE, Vol.11, No.1, pp.1-6, 2003.
  3. H. S. Sim, K. Min and S. H. Chung, "Reducing Exhaust Hydrocarbon at Gasoline Engine with Catalytic Converter using Synchronized Secondary Air Injection," Transactions of KSAE, Vol.9, No.2, pp.67-74, 2001.
  4. M. Borland and F. Zhao, "Application of Secondary Air Injection for Simultaneously Reducing Converter-In Emissions and Improving Catalyst Light-Off Performance," SAE 2002-01-2803, 2002.
  5. A. Onorari, G. Ferrari and G. D'Errico, "Secondary Air Injection in the Exhaust After-Treatment System of S.I Engines: 1D Fluid Dynamic Modeling and Experimental Investigation," SAE 2003-01-0366, 2003.
  6. H. Weltens, H. Bressler, F. Terres, H. Neumaier and D. Rammoser, "Optimization of Catalytic Converter Gas Flow Distribution by CFD Prediction," SAE 930780, 1993.