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Technical Paper

Thermal Analysis of Diesel After-Treatment System

2010-04-12
2010-01-1215
In order to meet the mandated EPA2010 emissions for heavy duty commercial vehicle regulations, most applications require very large, complex, yet compact exhaust after-treatment systems. These systems not only contain the necessary substrates and filters to perform the proper emissions conversion, they also typically will consist of mixing pipes and internal reversing chambers all within very tight space proximity. Some of these systems are able to accomplish the complete emissions reduction and conversion within a single, large packaging unit. While there are advantages in fuel efficiency and perhaps overall packaging with these “single box” units, the disadvantage of these types of designs is that it prohibits many internal components from cooling down by the outside environment, which can pose thermal mechanical durability challenges.
Technical Paper

Heavy Duty Diesel After-Treatment System Analysis Based Design: Fluid, Thermal and Structural Considerations

2009-04-20
2009-01-0624
This paper gives an overview of the development work for a diesel after-treatment system, used in heavy duty trucks to fulfill the new US emissions limits. The paper starts with the description of design evaluation and optimization studies on heavy duty diesel exhaust after-treatment system using numerical simulation. The studies involve initial conceptual design evaluation of the entire after-treatment system for fluid flow, temperature distribution, and subsequent structural loads. Computer modeling, as complementary approach to prototyping and experimental investigations, helps to make basic design decisions and therefore to shorten the overall development process. The numerical simulation involves computational fluid dynamics (CFD) analysis for fluid flow and temperature distribution and finite element analysis (FEA) for subsequent structural analysis. The first part of the paper involves computational fluid dynamic optimization study related to diesel exhaust system.
Technical Paper

Numerical Study on Skin Temperature and Heat Loss of Vehicle Exhaust System

2005-04-11
2005-01-1622
The ability to accurately predict skin temperatures of catalytic converter and manifold is very important for a robust/durable design of the vehicle exhaust system, especially in the development of close coupled converter system. In this paper, Computational Fluid Dynamics (CFD) is used to calculate the skin temperature of complicated components in vehicle exhaust system such as catalytic converter. Generally, a catalytic converter consists of substrate, mat, outer shell, inner cone, cone insulation, and outer cone. 3-D compressible turbulent fluid flow with heat transfer involved in force and natural convections, heat conduction and radiation is numerically simulated. First, both numerical calculation and experimental tests are conducted for a catalytic converter under the same operation conditions to evaluate the accuracy of current numerical method. Good agreement is found between CFD prediction and experimental tests.
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