This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
A Study of Flow Characteristics Inside the Two Types of Exhaust Manifold and CCC Systems
Technical Paper
1999-01-0457
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
A study of unsteady compressible flow for two types of exhaust manifold and CCC (Close-Coupled Catalyst) systems attached to a 4-cylinder DOHC gasoline engine was carried out to investigate the flow distribution of exhaust gases and finally to make the conversion efficiency of catalyst better. An experimental study was conducted, using LDV technique, to measure the velocity distributions inside exhaust manifolds and CCC under practical engine conditions. In this study, through experiment and calculation, the effects of geometric configuration of exhaust manifold on flow maldistribution in monolith were mainly investigated to understand the exhaust flow structure in terms of flow uniformity and to improve the conversion efficiency. As a result of this fundamental study, the modified exhaust manifold (Type B) was designed and manufactured. Full load performance tests and vehicle emission tests were performed to see the effects of flow characteristics on engine performance and emission. It was found that the THC emission level of Type B under cold start conditions was reduced by 12 %, and that L.O.T. (Light-Off Temperature) was shortened by about 5 sec at the center of the frontal surface of the first monolith.
Recommended Content
Authors
Citation
Kim, H., Park, S., Myung, C., Cho, K. et al., "A Study of Flow Characteristics Inside the Two Types of Exhaust Manifold and CCC Systems," SAE Technical Paper 1999-01-0457, 1999, https://doi.org/10.4271/1999-01-0457.Also In
Gas Direct Injection Aftertreatment and Exhaust Aftertreatment Modeling
Number: SP-1455; Published: 1999-03-01
Number: SP-1455; Published: 1999-03-01
References
- Zhao Fu-Quan Li Li Xie Xingbin Lai Ming-Chia “An Experimental Study of the Flow Structure Inside the Catalytic Converter of a Gasoline Engine” SAE Technical Paper No. 950784 1995
- Zhao Fu-Quan Bai Ling Liu Yi Chue Tsan-Hai Lai Ming-Chia “Transient Flow Characteristics Inside the Catalytic Converter of a Firing Gasoline Engine” SAE Technical Paper No. 971014 1997
- Park Sang-Bong Kim Han-Sang Cho Kyung-Min Kim Woo-Tae “An Experimental and Computational study of Flow Characteristics in Exhaust Manifold and CCC (Close-Coupled Catalyst)” SAE Technical Paper No. 980128 1998
- Welten Herman Bressler Harald Terres Frank Neumaier Hubert Rammoser Detlev “Optimization of Catalytic Converter Gas Flow Distribution by CFD Prediction” SAE Technical Paper No. 930780 1993
- Bressler Harald Rammoser Detlev Neumaier Hubert Terres Frank “Experimental and Predictive Investigation of a Close Coupled Catalyst Converter with Pulsating Flow” SAE Technical Paper No. 960564 1996
- Martin A. P. Will N. S. Bordet A. Cornet P. Gondoin C. Mouton X. “Effect of Flow Distribution on Emissions Performance of Catalytic Converters” SAE Technical Paper No. 980936 1998
- Jeong Soojin Kim Taehun “CFD Investigation of the 3-Dimensional Unsteady Flow in the Catalytic Converter” SAE Technical Paper No. 971025 1997
- Kishi Noriyuki Hashimoto Hiroshi Fujimori Koich Ishii Kazuo Komatsuda Takashi “Development of the Ultra Low Heat Capacity and Highly Insulating (ULOC) Exhaust Manifold for ULEV” SAE Technical Paper No. 980937 1998
- STAR-CD Version 3.05 User's Manual 1998 Computational Dynamics Limited