International Journal of Automotive Technology

The Korean Society of Automotive Engineers (한국자동차공학회)
권호 표지

EXPERIMENTAL APPROACH FOR EVALUATING EXHAUST FLOW DISTRIBUTION FOR PZEV EXHAUST MANIFOLDS USING A SIMULATED DYNAMIC FLOW BENCH

  • Hwang, I.G. (Department of Mechanical Engineering, Korea University) ;
  • Myung, C.L. (Department of Mechanical Engineering, Korea University) ;
  • Kim, H.S. (School of Mechanical and Aerospace Engineering, Seoul National University) ;
  • Park, S. (Department of Mechanical Engineering, Korea University)
  • Published : 2007.10.01
Download PDF
⟨ Previous Next ⟩

Abstract

As current and future automobile emission regulations become more stringent, the research on flow distribution for an exhaust manifold and close-coupled catalyst(CCC) has become an interesting and remarkable subjects. The design of a CCC and exhaust manifold is a formidable task due to the complexity of the flow distribution caused by the pulsating flows from piston motion and engine combustion. Transient flow at the exhaust manifold can be analyzed with various computational fluid dynamics(CFD) tools. However, the results of such simulations must be verified with appropriate experimental data from real engine operating condition. In this study, an experimental approach was performed to investigate the flow distribution of exhaust gases for conventional cast types and stainless steel bending types of a four-cylinder engine. The pressure distribution of each exhaust sub-component was measured using a simulated dynamic flow bench and five-hole pitot probe. Moreover, using the results of the pitot tube measurement at the exit of the CCC, the flow distribution for two types of manifolds(cast type and bending type) was compared in terms of flow uniformity. Based on these experimental techniques, this study can be highly applicable to the design and optimization of exhaust for the better use of catalytic converters to meet the PZEV emission regulation.

Keywords

References

  1. Arias-Garcia, A., Benjamin, S. F., Zhao, H. and Farr, S. (2001). A comparison of steady, pulsating flow measurements and CFD simulations in close coupled catalysts. SAE Paper No. 2001-01-3662
  2. Kidokoro, T., Hoshi, K., Hiraku, K., Satoya, L., Watanabe, K., Fujiwara, T. and Suzuki, H. (2003). Development of PZEV exhaust emission control system. SAE Paper No. 2003-01-0817
  3. Kim, D., Kwak, H. and Park, S. (2005). Flow analysis with CFD on the exhaust manifolds for PZEV. Spring Conf. Proc., Korean Society of Mechanical Egineers, 3112−3117
  4. Kim, H. S., Min, K., Myung, C. L. and Park, S. (2002). A combined experimental and computational approach to improve catalyst flow uniformity and light-off behavior. Proc. Instn. Mech. Eng., 216, Part D: J. Automobile Engineering, 413−430
  5. Kim, I. T., Lee, W. J., Yoon, J. S. and Park, C. K. (2001). An exploratory study of THC emission reduction technologied compliant with SULEV regulations. Int. J. Automotive Technology 2, 2, 63−75
  6. Mueller-Haas, K., Brueck, R., Rieck, J. S., Webb, C. C. and Shaw, K. A. (2003). FTP and US06 performance of advanced high cell density metallic substrates as a function of varying air/fuel modulation. SAE Paper No. 2003-01-0819
  7. Park, S. B., Kim, H. S., Cho, K. M. and Kim, W. T. (1998). An experimental and computational study of flow characteristics in exhaust manifold and CCC (Closed-Coupled Catalyst). SAE Paper No. 980128
  8. Persoons, T., Van den Bluck, E. and Fausto, S. (2004). Study of pulsating flow in close coupled catalyst manifolds using phase-locked hot-wire anemometry. Exp. Fluids 36, 2, 217−232
  9. Weltens, H., Bressler, H., Terres, F., Neumaier, H. and Rammoser, D. (1999). Optimization of catalytic converter gas flow distribution by CFD predition. SAE Paper No. 930780