The Research On Structural Design Of Gasoline Engine Exhaust Catalytic Converter

In this paper, we concluded that catalytic converter is the main countermeasure in controlling the automotive exhaust emission by systemically summarizing the research status of the world engine exhaust treatment technology.Through analyzing the idea of carrier and gasket in the catalytic converters, a new design method of catalytic converters is introduced. The experimental research is carried out. The test results indicate that this method is effective.Catalytic converter is one of the main countermeasures in controlling the automotive exhaust emission in the world. Most of the gasoline engine of car and light duty truck have been installed the catalytic converter in the U.S., Japan and Europe. From the review and analysis of a great number of foreign literatures, a set of evaluation technique and test method for reliability of automotive catalytic assembly has been set up. In this way, life span of catalytic converter assembly can be checkout in short time. A set of evaluation and test method has been put forward and the test bench has been built up. Some catalyst converters on the Chinese market as the sample have been tested on the bench, but many quality problems have been found. So the significance of establishing evaluation system on test bench as soon as possible to the research and development of automotive catalyst assembly in China was discussed.A mathematical model of flows in the substrate was established using the equivalent continuum approach, and multi-dimensional numericalsimulation of the steady flows in the catalytic converters was performed. Simulation results show that the separation and vortex, which cause the pressure loss and the velocity non-uniformity at the front of the first substrate, are generated near the wall of the conical pipe. In addition, the larger the inlet cones angle the more the pressure loss and maldistribution in converters, however, when the angle enlarges enough the pressure loss would be decrease. The angle's effect on flows will be decreased thereafter. Through numerical simulation, the optimized design of catalytic converters gets many informations. Numerical simulation has been an effective method in the design of catalytic converters with experimental research.