An Experimental and Computational Study of Flow Characteristics in Exhaust Manifold and CCC (Close-Coupled Catalyst) 980128
A combined experimental and computational study of 3-D unsteady compressible flow in exhaust manifold and CCC system was performed to understand the flow characteristics and to improve the flow distribution of pulsating exhaust gases within monolith. An experimental study was carried out to measure the velocity distribution in production exhaust manifold and CCC under engine operating conditions using LDV (Laser Doppler Velocimetry) system. Velocity characteristics were measured at planes 25 mm away from the front surface of first monolith and between two monolithic bricks. To provide boundary conditions for the computational study, velocity fields according to crank angle were also measured at the entrance of exhaust manifold. The comparisons of exhaust gas flow patterns in the junction and mixing pipe between experimental and computational results were made. Through the computational study, the effects of junction and mixing pipe geometry on flow maldistribution in monolith were mainly investigated to provide the design guidance.
Citation: Park, S., Kim, H., Cho, K., and Kim, W., "An Experimental and Computational Study of Flow Characteristics in Exhaust Manifold and CCC (Close-Coupled Catalyst)," SAE Technical Paper 980128, 1998, https://doi.org/10.4271/980128. Download Citation
Sang-Bong Park, Han-Sang Kim, Kyung-Min Cho, Woo-Tae Kim
Hyundai Motor Company
International Congress & Exposition
Advances in Multi-Dimensional Modeling-SP-1329, SAE 1998 Transactions - Journal of Engines-V107-3